{"id":34315,"date":"2019-10-31T12:23:36","date_gmt":"2019-10-31T11:23:36","guid":{"rendered":"https:\/\/groupe-reussite.fr\/?p=34315"},"modified":"2023-05-23T17:09:20","modified_gmt":"2023-05-23T16:09:20","slug":"exemple-colle-physique-prepa","status":"publish","type":"post","link":"https:\/\/groupe-reussite.fr\/ressources\/blog\/exemple-colle-physique-prepa\/","title":{"rendered":"Colle de physique en pr\u00e9pa tomb\u00e9e aux concours"},"content":{"rendered":"\r\n<h1>Exemple de colle de physique en pr\u00e9pa scientifique pour s&rsquo;entra\u00eener<\/h1>\r\n\r\n\r\n\r\n<p><\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\">Les interrogations orales de physique en pr\u00e9pa ou kh\u00f4lle de physique sont l\u00e9gion en cours de pr\u00e9pa scientifique. C&rsquo;est aussi ce format que vous rencontrerez aux concours CPGE durant les \u00e9preuves orales. Il faut donc s&rsquo;y pr\u00e9parer comme tout autre oral (par exemple <a href=\"https:\/\/groupe-reussite.fr\/ressources\/blog\/oral-francais-prepa\/\">oral de fran\u00e7ais en pr\u00e9pa<\/a>). Les 5\/2 auront \u00e0 c\u0153ur de travailler d\u00e8s le d\u00e9but d&rsquo;ann\u00e9e sur des annales de concours d&rsquo;ing\u00e9nieur ou sur des colles de physique tomb\u00e9es aux concours pour int\u00e9grer Polytechnique. Pour un d\u00e9but d&rsquo;entra\u00eenement vous trouverez ci-dessous 2 exemples de colle de physique pour les \u00e9l\u00e8ves de cours maths sp\u00e9. D&rsquo;autres exemples suivront si vous nous le demandez &#x1f61c; en commentaire tout en bas ! Aussi n&rsquo;oubliez pas notre app mobile gratuite en maths pour les maths sp\u00e9 \ud83d\ude42 un pr\u00e9cieux compagnon jusqu&rsquo;aux concours !<\/p>\r\n<p>&nbsp;<\/p>\r\n<p style=\"text-align: justify;\">\t\t<div data-elementor-type=\"section\" data-elementor-id=\"43056\" class=\"elementor elementor-43056\">\n\t\t\t\t\t<div class=\"elementor-section-wrap\">\n\t\t\t\t\t\t\t\t<section class=\"has_ae_slider elementor-section elementor-inner-section elementor-element elementor-element-4e93235 elementor-section-content-bottom full_width elementor-section-full_width elementor-section-height-min-height elementor-section-height-default ae-bg-gallery-type-default\" data-id=\"4e93235\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-narrow\">\n\t\t\t\t\t\t\t<div class=\"elementor-row\">\n\t\t\t\t\t<div class=\"has_ae_slider elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-28ca74cf ae-bg-gallery-type-default\" data-id=\"28ca74cf\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_ae_slider elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-77c741aa ae-bg-gallery-type-default\" data-id=\"77c741aa\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1a9563c0 elementor-widget elementor-widget-heading\" data-id=\"1a9563c0\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">STAGE INTENSIF EN PR\u00c9PA SCIENTIFIQUE<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-11d9db92 elementor-widget elementor-widget-heading\" data-id=\"11d9db92\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Profite de tes vacances pour progresser en vue des concours.<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-21cedec3 elementor-widget elementor-widget-text-editor\" data-id=\"21cedec3\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-text-editor elementor-clearfix\">\n\t\t\t\t<p style=\"text-align: left;\"><strong><span style=\"color: #e5a431;\">96%<\/span><\/strong> \u00a0<span style=\"color: #183153;\">de r\u00e9ussite aux concours<\/span><br \/><span style=\"color: #97caef;\"><strong>44%<\/strong><\/span> <span style=\"color: #183153;\">dans le TOP 10<\/span><br \/><strong><span style=\"color: #a64d79;\">99%<\/span><\/strong> <span style=\"color: #183153;\">de recommandation<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5681a97a elementor-align-center elementor-mobile-align-center elementor-widget elementor-widget-button\" data-id=\"5681a97a\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a href=\"https:\/\/groupe-reussite.fr\/stages\/toutes-matieres\/prepa-scientifique\/france\/toutes-periodes\/\" target=\"_blank\" class=\"elementor-button-link elementor-button elementor-size-md\" role=\"button\" id=\"CTA_PRD_STAGE\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Stage pr\u00e9pa<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4a3db500 elementor-widget elementor-widget-text-editor\" data-id=\"4a3db500\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-text-editor elementor-clearfix\">\n\t\t\t\t<p style=\"text-align: center;\"><b>Avis Google France <\/b><span style=\"color: #e5a430;\"><b>\u2605\u2605\u2605\u2605\u2605<\/b><\/span><b> 4,9 sur 5<\/b><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\r\n\r\n\r\n\r\n<h2>\u00a0<\/h2>\r\n<h2 style=\"text-align: justify;\">Exercice 1 : kh\u00f4lle de physique optique, un grand classique<\/h2>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\">On dispose d&rsquo;un banc optique sur lequel sont align\u00e9s, dans l&rsquo;ordre, un objet r\u00e9el <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-0ed70d9eda8900e982a93058f1adf56e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#65;&#66;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"28\" style=\"vertical-align: 0px;\"\/>, une lentille de distance focale <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-f873324928dbe3d6a262d9c9fe13fa35_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#102;&#94;&#92;&#112;&#114;&#105;&#109;&#101;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"15\" style=\"vertical-align: -4px;\"\/> en <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-41136ed7463f7254f4e6df131f8be490_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#79;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"14\" style=\"vertical-align: 0px;\"\/> et un \u00e9cran sur lequel on forme l&rsquo;image <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2243e3caad1d564ecf7c9884bdee34a1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#65;&#94;&#92;&#112;&#114;&#105;&#109;&#101;&#32;&#66;&#94;&#92;&#112;&#114;&#105;&#109;&#101;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"37\" style=\"vertical-align: 0px;\"\/>. On note <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-4b9ef1bbd23fd1b198de883813285620_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#68;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"15\" style=\"vertical-align: 0px;\"\/> la distance s\u00e9parant l&rsquo;objet de son image. Quelle est la condition sur <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-4b9ef1bbd23fd1b198de883813285620_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#68;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"15\" style=\"vertical-align: 0px;\"\/> pour qu&rsquo;un objet r\u00e9el done une image r\u00e9elle ?<\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\"><em>Prologue : cet exercice est un classique. Il est souvent trait\u00e9 en <a href=\"https:\/\/groupe-reussite.fr\/cours-particuliers\/physique\/tous-niveaux\/france\/\">cours de physique<\/a>, mais pas toujours. Il n&rsquo;y a pas de difficult\u00e9 particuli\u00e8re, donc il permet d&rsquo;\u00e9valuer la ma\u00eetrise du cours par l&rsquo;\u00e9tudiant, ainsi que sa compr\u00e9hension de l&rsquo;optique.<\/em><\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\"><strong>1)<\/strong> On commence l&rsquo;exercice en faisant un <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-9dcd6912f465965e8fb18fe46b3b2c4f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#116;&#101;&#120;&#116;&#98;&#102;&#123;&#115;&#99;&#104;&#92;&#39;&#101;&#109;&#97;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"64\" style=\"vertical-align: 0px;\"\/> comportant les \u00e9l\u00e9ments suivants :<\/p>\r\n<ul>\r\n<li style=\"text-align: justify;\">l&rsquo;axe optique<\/li>\r\n<li style=\"text-align: justify;\">les conventions pour les longueurs et les angles<\/li>\r\n<li style=\"text-align: justify;\">l&rsquo;objet r\u00e9el, la lentille et l&rsquo;\u00e9cran, et faire appara\u00eetre la distance <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-4b9ef1bbd23fd1b198de883813285620_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#68;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"15\" style=\"vertical-align: 0px;\"\/>.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\"><strong>2)<\/strong> Un objet est r\u00e9el ssi <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-199281c1e2523ad724b031a27b004de8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#65;&#79;&#125;&#62;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"60\" style=\"vertical-align: 0px;\"\/>, et son image est r\u00e9elle ssi <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-66634fe5c1521b30d7fc5b63c0ab6318_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#79;&#65;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;&#125;&#62;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"64\" style=\"vertical-align: 0px;\"\/>.<\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\"><strong>3) <\/strong>La relation de conjugaison pour une lentille convergente s&rsquo;\u00e9crit : <p class=\"ql-center-displayed-equation\" style=\"line-height: 40px;\"><span class=\"ql-right-eqno\"> &nbsp; <\/span><span class=\"ql-left-eqno\"> &nbsp; <\/span><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-8361a62a68c2b745fad9deed67ae0a69_l3.png\" height=\"40\" width=\"128\" class=\"ql-img-displayed-equation quicklatex-auto-format\" alt=\"&#92;&#091;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#49;&#125;&#123;&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#79;&#65;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;&#125;&#125;&#32;&#45;&#32;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#49;&#125;&#123;&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#79;&#65;&#125;&#125;&#32;&#61;&#32;&#92;&#100;&#102;&#114;&#97;&#99;&#123;&#49;&#125;&#123;&#102;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;&#125;&#92;&#093;\" title=\"Rendered by QuickLaTeX.com\"\/><\/p><\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\"><strong>4) <\/strong>On cherche une condition sur <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-4b9ef1bbd23fd1b198de883813285620_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#68;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"15\" style=\"vertical-align: 0px;\"\/> telle que <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-66634fe5c1521b30d7fc5b63c0ab6318_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#79;&#65;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;&#125;&#62;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"64\" style=\"vertical-align: 0px;\"\/> . On fait appara\u00eetre <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-4b9ef1bbd23fd1b198de883813285620_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#68;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"15\" style=\"vertical-align: 0px;\"\/> en utilisant <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-ad392366cb26ff07dfda43121369a418_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#68;&#32;&#61;&#32;&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#65;&#79;&#125;&#43;&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#79;&#65;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"120\" style=\"vertical-align: -2px;\"\/> (les longueurs sont alg\u00e9briques), ce qui \u00e9limine <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-1fb0377fb7fdf056a1f7a836388dd813_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#65;&#79;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"28\" style=\"vertical-align: 0px;\"\/>, puis on r\u00e9arrange l&rsquo;expression pour obtenir : <p class=\"ql-center-displayed-equation\" style=\"line-height: 24px;\"><span class=\"ql-right-eqno\"> &nbsp; <\/span><span class=\"ql-left-eqno\"> &nbsp; <\/span><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5ba5272924785985c210ae15a601cae8_l3.png\" height=\"24\" width=\"193\" class=\"ql-img-displayed-equation quicklatex-auto-format\" alt=\"&#92;&#091;&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#79;&#65;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;&#125;&#94;&#50;&#32;&#45;&#32;&#68;&#32;&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#79;&#65;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;&#125;&#32;&#43;&#32;&#68;&#102;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;&#32;&#61;&#32;&#48;&#92;&#093;\" title=\"Rendered by QuickLaTeX.com\"\/><\/p><\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\">C&rsquo;est un polyn\u00f4me d&rsquo;ordre 2 \u00e0 coefficients r\u00e9els dont le discriminant est <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-e5707c3e756b4d78a27d8d8f4b58b242_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#68;&#101;&#108;&#116;&#97;&#32;&#61;&#32;&#68;&#92;&#108;&#101;&#102;&#116;&#40;&#68;&#45;&#52;&#102;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;&#92;&#114;&#105;&#103;&#104;&#116;&#41;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"130\" style=\"vertical-align: -4px;\"\/>.<\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\"><strong>5)<\/strong> Si <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-3794e8d46f156ac73889f2804d615185_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#68;&#101;&#108;&#116;&#97;&#60;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"47\" style=\"vertical-align: 0px;\"\/> (<img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-8aa0644f720aa44822d70d22564dea35_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#68;&#60;&#52;&#102;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"62\" style=\"vertical-align: -4px;\"\/>), il n&rsquo;y a pas d&rsquo;image du tout. Cela veut dire qu&rsquo;en fixant une distance <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-8aa0644f720aa44822d70d22564dea35_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#68;&#60;&#52;&#102;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"62\" style=\"vertical-align: -4px;\"\/> on ne peut pas d\u00e9placer le syst\u00e8me objet+\u00e9cran jusqu&rsquo;\u00e0 avoir une image <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2243e3caad1d564ecf7c9884bdee34a1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#65;&#94;&#92;&#112;&#114;&#105;&#109;&#101;&#32;&#66;&#94;&#92;&#112;&#114;&#105;&#109;&#101;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"37\" style=\"vertical-align: 0px;\"\/> nette sur l&rsquo;\u00e9cran (peu importe si l&rsquo;image et l&rsquo;objet soient r\u00e9els ou virtuels !).<\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\">Si <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5d47cfb9e1f8bd5913a8262121c8161f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#68;&#101;&#108;&#116;&#97;&#62;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"47\" style=\"vertical-align: 0px;\"\/> (<img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-4a393a9a5ae463ab754123634a68837c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#68;&#62;&#52;&#102;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"62\" style=\"vertical-align: -4px;\"\/>), il est possible de d\u00e9placer le syst\u00e8me objet+\u00e9cran et trouver <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-7e1e73ea5e4807fcc8779c9f3166ef64_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#116;&#101;&#120;&#116;&#98;&#102;&#123;&#100;&#101;&#117;&#120;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"42\" style=\"vertical-align: 0px;\"\/> positions telles que l&rsquo;image <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2243e3caad1d564ecf7c9884bdee34a1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#65;&#94;&#92;&#112;&#114;&#105;&#109;&#101;&#32;&#66;&#94;&#92;&#112;&#114;&#105;&#109;&#101;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"37\" style=\"vertical-align: 0px;\"\/> soit nette sur l&rsquo;\u00e9cran. Les deux positions sont d\u00e9termin\u00e9es par les racines du polyn\u00f4me : <p class=\"ql-center-displayed-equation\" style=\"line-height: 36px;\"><span class=\"ql-right-eqno\"> &nbsp; <\/span><span class=\"ql-left-eqno\"> &nbsp; <\/span><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-02602cb87a3bbf7ec8041fc0e7d901c3_l3.png\" height=\"36\" width=\"235\" class=\"ql-img-displayed-equation quicklatex-auto-format\" alt=\"&#92;&#091;&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#79;&#65;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;&#125;&#32;&#61;&#32;&#92;&#102;&#114;&#97;&#99;&#123;&#49;&#125;&#123;&#50;&#125;&#92;&#108;&#101;&#102;&#116;&#40;&#68;&#32;&#92;&#112;&#109;&#32;&#92;&#115;&#113;&#114;&#116;&#123;&#68;&#40;&#68;&#45;&#52;&#102;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;&#41;&#125;&#92;&#114;&#105;&#103;&#104;&#116;&#41;&#92;&#093;\" title=\"Rendered by QuickLaTeX.com\"\/><\/p><\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\">On constate alors que la solution avec un + donne bien <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-66634fe5c1521b30d7fc5b63c0ab6318_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#79;&#65;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;&#125;&#62;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"64\" style=\"vertical-align: 0px;\"\/>. La condition n\u00e9cessaire est donc <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2ad7c4129c0a58a65a305f8854db3b3b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#98;&#111;&#120;&#101;&#100;&#123;&#68;&#32;&#92;&#103;&#101;&#113;&#32;&#52;&#32;&#102;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"29\" width=\"74\" style=\"vertical-align: -9px;\"\/>.<\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\">Le cas limite <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-4ed7c4bfc6825e412099592719b2dda9_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#68;&#61;&#52;&#102;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"62\" style=\"vertical-align: -4px;\"\/> donne <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-52ad4ad2ee4a2be56393f77c1edd69f8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#111;&#118;&#101;&#114;&#108;&#105;&#110;&#101;&#123;&#79;&#65;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;&#125;&#32;&#61;&#32;&#92;&#102;&#114;&#97;&#99;&#123;&#68;&#125;&#123;&#50;&#125;&#32;&#61;&#32;&#50;&#102;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"22\" width=\"118\" style=\"vertical-align: -6px;\"\/>. Autrement dit, l&rsquo;objet \u00e0 <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-424a9cfb4e2fb65a20d8c35f334c3913_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#50;&#102;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"23\" style=\"vertical-align: -4px;\"\/> avant la lentille, et l&rsquo;\u00e9cran \u00e0 <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-424a9cfb4e2fb65a20d8c35f334c3913_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#50;&#102;&#94;&#123;&#92;&#112;&#114;&#105;&#109;&#101;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"23\" style=\"vertical-align: -4px;\"\/> apr\u00e8s la lentille.<\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\">\u00c9pilogue : cet exercice est facile et ne doit pas prendre plus de 30 minutes \u00e0 faire. La difficult\u00e9 est d&rsquo;expliquer <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-4ca8c00e04c1f43fe90a1c56fdf83566_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#116;&#101;&#120;&#116;&#98;&#102;&#123;&#112;&#111;&#117;&#114;&#113;&#117;&#111;&#105;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"79\" style=\"vertical-align: -3px;\"\/> on cherche les racines du polyn\u00f4me et pourquoi le signe du discriminant est important. Il a une importance cruciale en TP : une lentille de distance focale <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-ca4a7a1f21c96049889ac9dfe8531dea_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#102;&#61;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"42\" style=\"vertical-align: -4px;\"\/> m n\u00e9cessite au minimum 4 m entre l&rsquo;objet et l&rsquo;\u00e9cran, ce qui est tr\u00e8s encombrant\u2026}<\/p>\r\n<p>&nbsp;<\/p>\r\n<p style=\"text-align: justify;\">\t\t<div data-elementor-type=\"section\" data-elementor-id=\"43056\" class=\"elementor elementor-43056\">\n\t\t\t\t\t<div class=\"elementor-section-wrap\">\n\t\t\t\t\t\t\t\t<section class=\"has_ae_slider elementor-section elementor-inner-section elementor-element elementor-element-4e93235 elementor-section-content-bottom full_width elementor-section-full_width elementor-section-height-min-height elementor-section-height-default ae-bg-gallery-type-default\" data-id=\"4e93235\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-narrow\">\n\t\t\t\t\t\t\t<div class=\"elementor-row\">\n\t\t\t\t\t<div class=\"has_ae_slider elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-28ca74cf ae-bg-gallery-type-default\" data-id=\"28ca74cf\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_ae_slider elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-77c741aa ae-bg-gallery-type-default\" data-id=\"77c741aa\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1a9563c0 elementor-widget elementor-widget-heading\" data-id=\"1a9563c0\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">STAGE INTENSIF EN PR\u00c9PA SCIENTIFIQUE<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-11d9db92 elementor-widget elementor-widget-heading\" data-id=\"11d9db92\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Profite de tes vacances pour progresser en vue des concours.<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-21cedec3 elementor-widget elementor-widget-text-editor\" data-id=\"21cedec3\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-text-editor elementor-clearfix\">\n\t\t\t\t<p style=\"text-align: left;\"><strong><span style=\"color: #e5a431;\">96%<\/span><\/strong> \u00a0<span style=\"color: #183153;\">de r\u00e9ussite aux concours<\/span><br \/><span style=\"color: #97caef;\"><strong>44%<\/strong><\/span> <span style=\"color: #183153;\">dans le TOP 10<\/span><br \/><strong><span style=\"color: #a64d79;\">99%<\/span><\/strong> <span style=\"color: #183153;\">de recommandation<\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5681a97a elementor-align-center elementor-mobile-align-center elementor-widget elementor-widget-button\" data-id=\"5681a97a\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a href=\"https:\/\/groupe-reussite.fr\/stages\/toutes-matieres\/prepa-scientifique\/france\/toutes-periodes\/\" target=\"_blank\" class=\"elementor-button-link elementor-button elementor-size-md\" role=\"button\" id=\"CTA_PRD_STAGE\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Stage pr\u00e9pa<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4a3db500 elementor-widget elementor-widget-text-editor\" data-id=\"4a3db500\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-text-editor elementor-clearfix\">\n\t\t\t\t<p style=\"text-align: center;\"><b>Avis Google France <\/b><span style=\"color: #e5a430;\"><b>\u2605\u2605\u2605\u2605\u2605<\/b><\/span><b> 4,9 sur 5<\/b><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n\r\n<h2 style=\"text-align: justify;\">Exercice 2 (d&rsquo;apr\u00e8s Centrale PSI 2016) : colle de physique en m\u00e9canique des fluides<\/h2>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\">On souhaite mesurer la viscosit\u00e9 <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-353d8843a56869470cc39f8575e0c785_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#101;&#116;&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"9\" style=\"vertical-align: -4px;\"\/> de l&rsquo;eau \u00e0 l&rsquo;aide du dispositif suivant :<\/p>\r\n\r\n\r\n\r\n<div class=\"wp-block-image\" style=\"text-align: justify;\">\r\n<figure class=\"aligncenter is-resized\"><img loading=\"lazy\" class=\"wp-image-34319 aligncenter\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/uploads\/2019\/08\/mariotte.png\" alt=\"\" width=\"425\" height=\"318\" srcset=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/uploads\/2019\/08\/mariotte.png 567w, https:\/\/groupe-reussite.fr\/ressources\/wp-content\/uploads\/2019\/08\/mariotte-300x224.png 300w\" sizes=\"(max-width: 425px) 100vw, 425px\" \/><\/figure>\r\n<\/div>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\">Dans la conduite, la vitesse est de la forme <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-e60724a946722fbaab7bf0a935082365_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#118;&#40;&#77;&#41;&#32;&#61;&#32;&#92;&#102;&#114;&#97;&#99;&#123;&#92;&#68;&#101;&#108;&#116;&#97;&#32;&#80;&#125;&#123;&#52;&#32;&#92;&#101;&#116;&#97;&#32;&#76;&#125;&#32;&#92;&#108;&#101;&#102;&#116;&#40;&#97;&#94;&#50;&#45;&#114;&#94;&#50;&#92;&#114;&#105;&#103;&#104;&#116;&#41;\" title=\"Rendered by QuickLaTeX.com\" height=\"25\" width=\"165\" style=\"vertical-align: -9px;\"\/>, o\u00f9 <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-c409433a9e2dfcdb83360a974d243f18_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#114;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"8\" style=\"vertical-align: 0px;\"\/> est la position (distance au centre de la conduite), <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-13c4163c927ebde87e2a5af3f7be4e60_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;&#61;&#50;&#46;&#53;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"55\" style=\"vertical-align: 0px;\"\/> mm est le rayon de la conduite, <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-60dcd5a715491b7cc8cf0dadce473f13_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#76;&#61;&#51;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"54\" style=\"vertical-align: 0px;\"\/> cm sa longueur et <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b353aabe8d58f13dc1febe2c2094bb98_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#68;&#101;&#108;&#116;&#97;&#32;&#80;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"29\" style=\"vertical-align: 0px;\"\/> la diff\u00e9rence de pression entre les deux extr\u00e9mit\u00e9s.<br \/><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2b6e225d778ccd32cb2bd9cc4eaead9a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#98;&#117;&#108;&#108;&#101;&#116;\" title=\"Rendered by QuickLaTeX.com\" height=\"7\" width=\"8\" style=\"vertical-align: 1px;\"\/> Calculer <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b353aabe8d58f13dc1febe2c2094bb98_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#68;&#101;&#108;&#116;&#97;&#32;&#80;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"29\" style=\"vertical-align: 0px;\"\/>, sachant que <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2992fc63c358d36cead9b60e56e9bda0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#72;&#61;&#50;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"58\" style=\"vertical-align: 0px;\"\/> cm et reste quasi-constant.<br \/><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2b6e225d778ccd32cb2bd9cc4eaead9a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#98;&#117;&#108;&#108;&#101;&#116;\" title=\"Rendered by QuickLaTeX.com\" height=\"7\" width=\"8\" style=\"vertical-align: 1px;\"\/> Calculer le d\u00e9bit massique <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-92a6a1b541d94a332feed78e62da73a0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#68;&#95;&#109;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"27\" style=\"vertical-align: -3px;\"\/> en sortie de la conduite.<br \/><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2b6e225d778ccd32cb2bd9cc4eaead9a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#98;&#117;&#108;&#108;&#101;&#116;\" title=\"Rendered by QuickLaTeX.com\" height=\"7\" width=\"8\" style=\"vertical-align: 1px;\"\/> On obtient 320 g de solution en 30 s. En d\u00e9duire <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-353d8843a56869470cc39f8575e0c785_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#101;&#116;&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"9\" style=\"vertical-align: -4px;\"\/>.<br \/><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2b6e225d778ccd32cb2bd9cc4eaead9a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#98;&#117;&#108;&#108;&#101;&#116;\" title=\"Rendered by QuickLaTeX.com\" height=\"7\" width=\"8\" style=\"vertical-align: 1px;\"\/> Quel est le type d&rsquo;\u00e9coulement dans la conduite ?<\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\"><strong>Prologue<\/strong> : pas de temps de pr\u00e9paration, l&rsquo;\u00e9tudiant passe directement au tableau. L&rsquo;exercice \u00e9tant un classique de m\u00e9canique des fluides (\u00e9coulement de Poiseuille), il est \u00ab\u00a0plus facile\u00a0\u00bb mais l&rsquo;examinateur pardonnera moins les erreurs et oublis du cours.<\/p>\r\n<p>&nbsp;<\/p>\r\n<p><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:513,&quot;3&quot;:{&quot;1&quot;:0},&quot;12&quot;:0}\">\t\t<div data-elementor-type=\"section\" data-elementor-id=\"163687\" class=\"elementor elementor-163687\">\n\t\t\t\t\t<div class=\"elementor-section-wrap\">\n\t\t\t\t\t\t\t\t<section class=\"has_ae_slider elementor-section elementor-inner-section elementor-element elementor-element-77e012ea elementor-section-content-bottom full_width elementor-section-full_width elementor-section-height-min-height elementor-section-height-default ae-bg-gallery-type-default\" data-id=\"77e012ea\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-narrow\">\n\t\t\t\t\t\t\t<div class=\"elementor-row\">\n\t\t\t\t\t<div class=\"has_ae_slider elementor-column elementor-col-66 elementor-inner-column elementor-element elementor-element-355ab73 ae-bg-gallery-type-default\" data-id=\"355ab73\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5d4ef7c3 elementor-widget elementor-widget-heading\" data-id=\"5d4ef7c3\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">COURS PARTICULIERS DE PHYSIQUE<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-db1f79b elementor-widget elementor-widget-heading\" data-id=\"db1f79b\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Nous avons recrut\u00e9 pour vous les meilleurs profs de physique.<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4dd0b35f elementor-widget elementor-widget-heading\" data-id=\"4dd0b35f\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">POUR M'AM\u00c9LIORER EN PHYSIQUE, JE CHERCHE DES<\/h4>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-167b42f7 elementor-align-left elementor-mobile-align-center elementor-widget elementor-widget-button\" data-id=\"167b42f7\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a href=\"https:\/\/groupe-reussite.fr\/cours-particuliers\/physique\/tous-niveaux\/france\/\" target=\"_blank\" class=\"elementor-button-link elementor-button elementor-size-md\" role=\"button\" id=\"CTA_PRD_CP\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Cours particuliers physique<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-60d6239c elementor-widget elementor-widget-text-editor\" data-id=\"60d6239c\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-text-editor elementor-clearfix\">\n\t\t\t\t<p style=\"text-align: left\"><b>Avis Google France <\/b><span style=\"color: #e5a430\"><b>\u2605\u2605\u2605\u2605\u2605<\/b><\/span><b> 4,9 sur 5<\/b><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_ae_slider elementor-column elementor-col-33 elementor-inner-column elementor-element elementor-element-1f06ea06 ae-bg-gallery-type-default\" data-id=\"1f06ea06\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-column-wrap\">\n\t\t\t\t\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<\/span><\/p>\r\n<p>&nbsp;<\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\"><strong>0)<\/strong> Dans tout exercice il est utile de d\u00e9finir des points fictifs pour d\u00e9signer les points dont on parle. On d\u00e9finit alors :<br \/><br \/><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2b6e225d778ccd32cb2bd9cc4eaead9a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#98;&#117;&#108;&#108;&#101;&#116;\" title=\"Rendered by QuickLaTeX.com\" height=\"7\" width=\"8\" style=\"vertical-align: 1px;\"\/> A le point \u00e0 la surface de l&rsquo;eau se trouvant dans le r\u00e9servoir<br \/><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2b6e225d778ccd32cb2bd9cc4eaead9a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#98;&#117;&#108;&#108;&#101;&#116;\" title=\"Rendered by QuickLaTeX.com\" height=\"7\" width=\"8\" style=\"vertical-align: 1px;\"\/> B le point entre le r\u00e9servoir et la conduite<br \/><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2b6e225d778ccd32cb2bd9cc4eaead9a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#98;&#117;&#108;&#108;&#101;&#116;\" title=\"Rendered by QuickLaTeX.com\" height=\"7\" width=\"8\" style=\"vertical-align: 1px;\"\/> C le point \u00e0 la sortie du conduite.<\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\"><strong>1)<\/strong> La pression \u00e9tant une grandeur continue, au point A la pression est celle de l&rsquo;atmosph\u00e8re. Comme <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-379db1fc1f84b7ce56b92463183097f9_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#72;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"16\" style=\"vertical-align: 0px;\"\/> varie peu, il faut comprendre qu&rsquo;on se place dans le cas <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-769da1f438c47660b04b6647b1749873_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#116;&#101;&#120;&#116;&#98;&#102;&#123;&#115;&#116;&#97;&#116;&#105;&#113;&#117;&#101;&#32;&#100;&#97;&#110;&#115;&#32;&#108;&#101;&#32;&#114;&#92;&#39;&#101;&#115;&#101;&#114;&#118;&#111;&#105;&#114;&#32;&#117;&#110;&#105;&#113;&#117;&#101;&#109;&#101;&#110;&#116;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"335\" style=\"vertical-align: -3px;\"\/> (entre A et B). La pression se calcule alors avec l&rsquo;\u00e9quation de l&rsquo;hydrostatique des fluides : <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-24121ab31ba4d7e5ae578769e44b916a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#118;&#101;&#99;&#123;&#103;&#114;&#97;&#100;&#125;&#32;&#80;&#32;&#61;&#32;&#45;&#92;&#114;&#104;&#111;&#32;&#103;\" title=\"Rendered by QuickLaTeX.com\" height=\"22\" width=\"106\" style=\"vertical-align: -4px;\"\/> ; qui apr\u00e8s int\u00e9gration donne <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-6cfbb1c3bb2a1a5e8a6d4d233faea547_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#68;&#101;&#108;&#116;&#97;&#32;&#80;&#32;&#61;&#32;&#80;&#95;&#66;&#32;&#45;&#32;&#80;&#95;&#65;&#32;&#61;&#32;&#92;&#114;&#104;&#111;&#32;&#103;&#32;&#72;\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"178\" style=\"vertical-align: -4px;\"\/>. L&rsquo;application num\u00e9rique donne <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-76ff44497cd7844e94829c03a8fd81d8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#68;&#101;&#108;&#116;&#97;&#32;&#80;&#32;&#61;&#32;&#50;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#49;&#48;&#94;&#51;\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"108\" style=\"vertical-align: -1px;\"\/> Pa.<\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\"><strong>2)<\/strong> Le profil des vitesses \u00e9tant donn\u00e9, on utilise la d\u00e9finition du d\u00e9bit massique : <p class=\"ql-center-displayed-equation\" style=\"line-height: 42px;\"><span class=\"ql-right-eqno\"> &nbsp; <\/span><span class=\"ql-left-eqno\"> &nbsp; <\/span><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-1b07ed1517a26644591bd8bbee4b63bf_l3.png\" height=\"42\" width=\"237\" class=\"ql-img-displayed-equation quicklatex-auto-format\" alt=\"&#92;&#091;&#68;&#95;&#109;&#32;&#61;&#32;&#92;&#105;&#110;&#116;&#95;&#123;&#92;&#116;&#101;&#120;&#116;&#123;&#83;&#101;&#99;&#116;&#105;&#111;&#110;&#32;&#100;&#101;&#32;&#108;&#97;&#32;&#99;&#111;&#110;&#100;&#117;&#105;&#116;&#101;&#125;&#125;&#32;&#92;&#114;&#104;&#111;&#32;&#118;&#32;&#100;&#83;&#92;&#093;\" title=\"Rendered by QuickLaTeX.com\"\/><\/p><\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\"><strong>Attention<\/strong> : comme la vitesse <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-ef71511c70f0e4b25cc6bd69f3bc20c2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#118;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/> varie avec la position dans la conduite, l&rsquo;int\u00e9grale doit \u00eatre faite <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-4614a860fcca239d217eef6dcf727d03_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#116;&#101;&#120;&#116;&#98;&#102;&#123;&#112;&#114;&#111;&#112;&#114;&#101;&#109;&#101;&#110;&#116;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"103\" style=\"vertical-align: -4px;\"\/>. Pour cela :<br \/><br \/><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2b6e225d778ccd32cb2bd9cc4eaead9a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#98;&#117;&#108;&#108;&#101;&#116;\" title=\"Rendered by QuickLaTeX.com\" height=\"7\" width=\"8\" style=\"vertical-align: 1px;\"\/> dire \u00e0 l&rsquo;oral qu&rsquo;on se place dans un syst\u00e8me de coordonn\u00e9es cylindriques associ\u00e9 \u00e0 la conduite (faire un dessin si \u00e7a peut vous aider).<br \/><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2b6e225d778ccd32cb2bd9cc4eaead9a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#98;&#117;&#108;&#108;&#101;&#116;\" title=\"Rendered by QuickLaTeX.com\" height=\"7\" width=\"8\" style=\"vertical-align: 1px;\"\/> expliciter l&rsquo;\u00e9l\u00e9ment infinit\u00e9simal de surface <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-df040fa512b782d31e30d3745af29363_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#100;&#83;&#32;&#61;&#32;&#114;&#100;&#114;&#100;&#92;&#116;&#104;&#101;&#116;&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"89\" style=\"vertical-align: 0px;\"\/><br \/><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-2b6e225d778ccd32cb2bd9cc4eaead9a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#98;&#117;&#108;&#108;&#101;&#116;\" title=\"Rendered by QuickLaTeX.com\" height=\"7\" width=\"8\" style=\"vertical-align: 1px;\"\/> \u00e9crire les bornes des deux int\u00e9grales (sur <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-c409433a9e2dfcdb83360a974d243f18_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#114;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"8\" style=\"vertical-align: 0px;\"\/> et <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-356a08e839ab6974a16448e16e56745d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#116;&#104;&#101;&#116;&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"9\" style=\"vertical-align: 0px;\"\/>).<\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\">L&rsquo;int\u00e9grale prend alors la forme suivante : <p class=\"ql-center-displayed-equation\" style=\"line-height: 44px;\"><span class=\"ql-right-eqno\"> &nbsp; <\/span><span class=\"ql-left-eqno\"> &nbsp; <\/span><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-0744b68a4fb2e5f52b46e6dc610b1ba2_l3.png\" height=\"44\" width=\"216\" class=\"ql-img-displayed-equation quicklatex-auto-format\" alt=\"&#92;&#091;&#68;&#95;&#109;&#32;&#61;&#32;&#92;&#105;&#110;&#116;&#95;&#123;&#114;&#61;&#48;&#125;&#94;&#123;&#97;&#125;&#32;&#92;&#105;&#110;&#116;&#95;&#123;&#92;&#116;&#104;&#101;&#116;&#97;&#61;&#48;&#125;&#94;&#123;&#50;&#92;&#112;&#105;&#125;&#32;&#92;&#114;&#104;&#111;&#32;&#118;&#40;&#114;&#41;&#32;&#114;&#100;&#114;&#100;&#92;&#116;&#104;&#101;&#116;&#97;&#32;&#46;&#92;&#093;\" title=\"Rendered by QuickLaTeX.com\"\/><\/p><br \/>Cette int\u00e9grale se calcule facilement, et donne apr\u00e8s simplification : <p class=\"ql-center-displayed-equation\" style=\"line-height: 43px;\"><span class=\"ql-right-eqno\"> &nbsp; <\/span><span class=\"ql-left-eqno\"> &nbsp; <\/span><img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-c4906b77beb96afa0be18ddf5f02cc75_l3.png\" height=\"43\" width=\"123\" class=\"ql-img-displayed-equation quicklatex-auto-format\" alt=\"&#92;&#091;&#68;&#95;&#109;&#32;&#61;&#32;&#92;&#102;&#114;&#97;&#99;&#123;&#92;&#114;&#104;&#111;&#32;&#92;&#112;&#105;&#32;&#97;&#94;&#52;&#125;&#123;&#56;&#32;&#92;&#101;&#116;&#97;&#32;&#76;&#125;&#32;&#92;&#68;&#101;&#108;&#116;&#97;&#32;&#80;&#32;&#46;&#92;&#093;\" title=\"Rendered by QuickLaTeX.com\"\/><\/p><\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\"><strong>3)<\/strong> L&rsquo;\u00e9nonc\u00e9 donne implicitement le d\u00e9bit massique (masse par unit\u00e9 de temps) <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-cc8c9e0cc05d4402dfa1db8cf1b9648e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#68;&#95;&#109;&#32;&#61;&#32;&#109;&#97;&#115;&#115;&#101;&#47;&#116;&#101;&#109;&#112;&#115;&#32;&#61;&#32;&#48;&#46;&#48;&#49;&#49;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"221\" style=\"vertical-align: -5px;\"\/> kg.s<img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-772758df4d6faef4f1eded0d79cb93b1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#94;&#123;&#45;&#49;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"10\" width=\"16\" style=\"vertical-align: 5px;\"\/>. On isole <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-353d8843a56869470cc39f8575e0c785_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#101;&#116;&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"9\" style=\"vertical-align: -4px;\"\/> dans l&rsquo;\u00e9quation pr\u00e9c\u00e9dente : <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-1dfa4e3cb74136e889b786cd0d965f28_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#101;&#116;&#97;&#32;&#61;&#32;&#92;&#102;&#114;&#97;&#99;&#123;&#92;&#114;&#104;&#111;&#32;&#92;&#112;&#105;&#32;&#97;&#94;&#52;&#125;&#123;&#56;&#32;&#76;&#32;&#68;&#95;&#109;&#125;&#32;&#92;&#68;&#101;&#108;&#116;&#97;&#32;&#80;\" title=\"Rendered by QuickLaTeX.com\" height=\"27\" width=\"105\" style=\"vertical-align: -8px;\"\/><\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\">L&rsquo;application num\u00e9rique (pour gagner du temps, ne faire qu&rsquo;un ordre de grandeur) donne : <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-48b9aa718e032ec4c8152a77b7c3beb2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#101;&#116;&#97;&#32;&#61;&#32;&#57;&#46;&#51;&#92;&#116;&#105;&#109;&#101;&#115;&#32;&#49;&#48;&#94;&#123;&#45;&#51;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"113\" style=\"vertical-align: -4px;\"\/> Pl. (comme dans tout calcul, attention aux unit\u00e9s)<\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\">Cette valeur est un peu \u00e9lev\u00e9e mais coh\u00e9rente avec la viscosit\u00e9 de l&rsquo;eau tabul\u00e9e : <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-a823c4f26b841acee4a617057efe7e2e_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#101;&#116;&#97;&#32;&#61;&#32;&#49;&#48;&#94;&#123;&#45;&#51;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"69\" style=\"vertical-align: -4px;\"\/> Pl. On peut argumenter en disant que lorsque <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-379db1fc1f84b7ce56b92463183097f9_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#72;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"16\" style=\"vertical-align: 0px;\"\/> diminue, <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-b353aabe8d58f13dc1febe2c2094bb98_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#68;&#101;&#108;&#116;&#97;&#32;&#80;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"29\" style=\"vertical-align: 0px;\"\/> diminue \u00e9galement, donc le d\u00e9bit baisse un peu, ce qui donne l&rsquo;illusion que le fluide est plus visqueux.<\/p>\r\n\r\n\r\n\r\n<p style=\"text-align: justify;\"><strong>4)<\/strong> Pour d\u00e9terminer le type d&rsquo;\u00e9coulement, il faut calculer le nombre de Reynolds d\u00e9fini dans le cours par <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-ab180ca2cfbc2850b4a599a93ffe0993_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#82;&#101;&#32;&#61;&#32;&#92;&#114;&#104;&#111;&#32;&#92;&#99;&#100;&#111;&#116;&#32;&#92;&#116;&#101;&#120;&#116;&#123;&#118;&#105;&#116;&#101;&#115;&#115;&#101;&#125;&#92;&#99;&#100;&#111;&#116;&#32;&#92;&#116;&#101;&#120;&#116;&#123;&#116;&#97;&#105;&#108;&#108;&#101;&#32;&#99;&#97;&#114;&#97;&#99;&#116;&#46;&#125;&#32;&#47;&#32;&#92;&#101;&#116;&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"246\" style=\"vertical-align: -5px;\"\/>. Ici, on peut prendre la vitesse au centre du tube, et la taille caract\u00e9ristique est le rayon de la conduite <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-5c53d6ebabdbcfa4e107550ea60b1b19_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#97;\" title=\"Rendered by QuickLaTeX.com\" height=\"8\" width=\"9\" style=\"vertical-align: 0px;\"\/>. On obtient alors <img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-51ad0fcb9b90b41291bd1aa13a9b3e26_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#82;&#101;&#32;&#92;&#115;&#105;&#109;&#32;&#49;&#48;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"72\" style=\"vertical-align: -1px;\"\/>. On est donc en r\u00e9gime laminaire (<img loading=\"lazy\" src=\"https:\/\/groupe-reussite.fr\/ressources\/wp-content\/ql-cache\/quicklatex.com-dbfb762c9464ec4e6d0217feb9932d2d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#82;&#101;&#60;&#50;&#48;&#48;&#48;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"81\" style=\"vertical-align: 0px;\"\/>).<\/p>\r\n<p>Lire d&rsquo;autres contenus pour progresser :<\/p>\r\n<ul>\r\n<li><a href=\"https:\/\/groupe-reussite.fr\/ressources\/blog\/progresser-si-prepa-scientifique\/\">R\u00e9ussir en SI en pr\u00e9pa<\/a><\/li>\r\n<li><a href=\"https:\/\/groupe-reussite.fr\/ressources\/blog\/reussir-informatique-prepa\/\">R\u00e9ussir en informatique en CPGE<\/a><\/li>\r\n<li><a href=\"https:\/\/groupe-reussite.fr\/ressources\/blog\/reussir-tipe-prepa-scientifique\/\">R\u00e9ussir son TIPE en pr\u00e9pa<\/a><\/li>\r\n<li><a href=\"https:\/\/groupe-reussite.fr\/ressources\/blog\/colle-maths-prepa\/\">R\u00e9ussir en colle en pr\u00e9pa en maths<\/a><\/li>\r\n<li><a href=\"https:\/\/groupe-reussite.fr\/ressources\/blog\/oral-francais-prepa\/\">Progresser \u00e0 l&rsquo;oral en fran\u00e7ais en CPGE<\/a><\/li>\r\n<\/ul>\r\n","protected":false},"excerpt":{"rendered":"<p>2 petits exemples pour vous donner un aper\u00e7u de ce qui peut tomber aux concours en colle de physique<\/p>\n","protected":false},"author":7,"featured_media":34428,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[126],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.2.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Exemple de colle de physique en pr\u00e9pa tomb\u00e9e aux concours<\/title>\n<meta name=\"description\" content=\"2 petits exemples pour vous donner un aper\u00e7u de ce qui peut tomber aux concours en kholle de physique. 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