{"id":934,"date":"2021-10-19T16:07:58","date_gmt":"2021-10-19T14:07:58","guid":{"rendered":"https:\/\/web.umons.ac.be\/charleroi\/?p=934"},"modified":"2021-10-19T16:07:58","modified_gmt":"2021-10-19T14:07:58","slug":"14-10-21-le-retour-des-invites-de-lumons-les-mysteres-de-la-relativite-restreinte","status":"publish","type":"post","link":"https:\/\/web.umons.ac.be\/charleroi\/2021\/10\/19\/14-10-21-le-retour-des-invites-de-lumons-les-mysteres-de-la-relativite-restreinte\/","title":{"rendered":"14.10.21 &#8211; Le retour des Invit\u00e9s de l&rsquo;UMONS &#8211; Les myst\u00e8res de la relativit\u00e9 restreinte"},"content":{"rendered":"<blockquote>\n<h1 style=\"text-align: left\"><span style=\"font-size: 14pt\"><strong><span style=\"font-family: helvetica, arial, sans-serif\">Tout le monde a d\u00e9j\u00e0 entendu parler d\u2019Albert Einstein et de sa th\u00e9orie de la relativit\u00e9 restreinte. Cependant, cette th\u00e9orie reste tr\u00e8s myst\u00e9rieuse et ses pr\u00e9dictions extraordinaires semblent d\u00e9fier le bon sens. Il est cependant possible de pr\u00e9senter simplement certains des aspects les plus d\u00e9routants de cette th\u00e9orie au moyen \u00ab d\u2019exp\u00e9riences de pens\u00e9e \u00bb. Ce proc\u00e9d\u00e9 cher \u00e0 Einstein consiste \u00e0 imaginer une exp\u00e9rience et \u00e0 en tirer les cons\u00e9quences logiques. <\/span><\/strong><\/span><\/h1>\n<\/blockquote>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-938 alignleft\" src=\"https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/51Xgc5ip88L._SX376_BO1204203200_-227x300.jpg\" alt=\"\" width=\"227\" height=\"300\" srcset=\"https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/51Xgc5ip88L._SX376_BO1204203200_-227x300.jpg 227w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/51Xgc5ip88L._SX376_BO1204203200_-30x40.jpg 30w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/51Xgc5ip88L._SX376_BO1204203200_-45x60.jpg 45w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/51Xgc5ip88L._SX376_BO1204203200_-360x475.jpg 360w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/51Xgc5ip88L._SX376_BO1204203200_.jpg 378w\" sizes=\"auto, (max-width: 227px) 100vw, 227px\" \/><br \/>\n<span style=\"font-family: helvetica, arial, sans-serif;font-size: 12pt\">Claude Semay nous a expliqu\u00e9 les notions suivantes: partant du fait, d\u00e9montr\u00e9 exp\u00e9rimentalement, qu\u2019il existe une vitesse invariante dans l\u2019univers, la vitesse de la lumi\u00e8re dans le vide, on peut ainsi montrer que la simultan\u00e9it\u00e9 est une notion relative et que les mesures de dur\u00e9es doivent d\u00e9pendre de l\u2019observateur. Cela conduit \u00e0 mettre en \u00e9vidence le ph\u00e9nom\u00e8ne de dilatation du temps dont la connaissance nous permet de faire fonctionner correctement le syst\u00e8me GPS.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-family: helvetica, arial, sans-serif;font-size: 12pt\">Ce ph\u00e9nom\u00e8ne est bien illustr\u00e9 de mani\u00e8re plus spectaculaire par le fameux faux paradoxe des jumeaux de Langevin dont les \u00e2ges diff\u00e8rent apr\u00e8s qu\u2019un des fr\u00e8res ait entrepris un voyage \u00e0 une vitesse proche de celle de la lumi\u00e8re. Cela n\u2019est jamais qu\u2019une mani\u00e8re ludique de montrer la possibilit\u00e9 de voyager dans le temps vers le futur, mais pas vers le pass\u00e9.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-937 alignleft\" src=\"https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/41iYTwHuyDL._SX302_BO1204203200_-183x300.jpg\" alt=\"\" width=\"183\" height=\"300\" srcset=\"https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/41iYTwHuyDL._SX302_BO1204203200_-183x300.jpg 183w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/41iYTwHuyDL._SX302_BO1204203200_-30x49.jpg 30w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/41iYTwHuyDL._SX302_BO1204203200_-37x60.jpg 37w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/41iYTwHuyDL._SX302_BO1204203200_.jpg 304w\" sizes=\"auto, (max-width: 183px) 100vw, 183px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-family: helvetica, arial, sans-serif;font-size: 12pt\">Il est \u00e9galement possible de montrer que le ph\u00e9nom\u00e8ne de contraction des longueurs est une cons\u00e9quence directe de la dilatation du temps. Une autre cons\u00e9quence de la relativit\u00e9 restreinte est la formule, sans doute la plus connue de toute la physique,<strong> <em>E<\/em> = <em>m c<\/em><sup>2<\/sup><\/strong>. La mati\u00e8re est ainsi un formidable r\u00e9servoir d\u2019\u00e9nergie dont il est difficile de profiter. Les r\u00e9actions chimiques de notre corps peuvent convertir lors de la digestion une fraction infime de la nourriture en \u00e9nergie utilisable qui va nous permettre de vivre.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-940 alignleft\" src=\"https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/245308298_1707902302734394_4174891412798444924_n-225x300.jpg\" alt=\"salle\" width=\"225\" height=\"300\" srcset=\"https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/245308298_1707902302734394_4174891412798444924_n-225x300.jpg 225w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/245308298_1707902302734394_4174891412798444924_n-768x1024.jpg 768w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/245308298_1707902302734394_4174891412798444924_n-1152x1536.jpg 1152w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/245308298_1707902302734394_4174891412798444924_n-495x660.jpg 495w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/245308298_1707902302734394_4174891412798444924_n-30x40.jpg 30w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/245308298_1707902302734394_4174891412798444924_n-45x60.jpg 45w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/245308298_1707902302734394_4174891412798444924_n-360x480.jpg 360w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2021\/10\/245308298_1707902302734394_4174891412798444924_n.jpg 1536w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-family: helvetica, arial, sans-serif;font-size: 12pt\">Nous remercions vivement Claude Semay pour ce partage enrichissant. La soir\u00e9e s&rsquo;est conclue par un drink et un \u00e9change convivial. Tous les participants en mode &lsquo;Covid Safe Ticket&rsquo; \u00e9taient ravis de pouvoir se rencontrer \u00e0 nouveau.<\/span><\/p>\n<p><span style=\"font-family: helvetica, arial, sans-serif;font-size: 12pt\">La prochaine conf\u00e9rence aura lieu le 9.11.2021 dans les locaux du boulevard Joseph II et accueillera Diane Thomas et son collaborateur Lionel Dubois.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-837\" src=\"https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2020\/05\/Logo_UMONS_CHARLEROI-300x191.jpg\" alt=\"\" width=\"300\" height=\"191\" srcset=\"https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2020\/05\/Logo_UMONS_CHARLEROI-300x191.jpg 300w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2020\/05\/Logo_UMONS_CHARLEROI-1024x651.jpg 1024w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2020\/05\/Logo_UMONS_CHARLEROI-768x488.jpg 768w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2020\/05\/Logo_UMONS_CHARLEROI-1039x660.jpg 1039w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2020\/05\/Logo_UMONS_CHARLEROI-30x19.jpg 30w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2020\/05\/Logo_UMONS_CHARLEROI-60x38.jpg 60w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2020\/05\/Logo_UMONS_CHARLEROI-360x229.jpg 360w, https:\/\/web.umons.ac.be\/app\/uploads\/sites\/43\/2020\/05\/Logo_UMONS_CHARLEROI.jpg 1454w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Apr\u00e8s une longue p\u00e9riode d&rsquo;interruption suite \u00e0 la crise sanitaire, c&rsquo;est avec grand plaisir que nous avons repris le cycle de conf\u00e9rences, Les Invit\u00e9s de l\u2019UMONS, dans nos b\u00e2timents du Boulevard Joseph II \u00e0 Charleroi.<\/p>\n<p>La premi\u00e8re conf\u00e9rence a accueilli le Prof. Claude Semay, un habitu\u00e9 de notre cycle, dont les qualit\u00e9s p\u00e9dagogiques bien connues ont \u00e9t\u00e9 particuli\u00e8rement utiles, puisqu&rsquo;il nous a parl\u00e9 de la relativit\u00e9 restreinte d&rsquo;Albert Einstein. En effet, c&rsquo;est en 1921, il y a donc exactement un si\u00e8cle, que ce grand physicien a re\u00e7u le Prix Nobel de Physique.<\/p>\n","protected":false},"author":56,"featured_media":938,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[52,25,58],"tags":[],"class_list":["post-934","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-alumni","category-conferences-colloques","category-entreprises"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>14.10.21 - Le retour des Invit\u00e9s de l&#039;UMONS - Les myst\u00e8res de la relativit\u00e9 restreinte - UMONS Charleroi<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/web.umons.ac.be\/charleroi\/2021\/10\/19\/14-10-21-le-retour-des-invites-de-lumons-les-mysteres-de-la-relativite-restreinte\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"14.10.21 - Le retour des Invit\u00e9s de l&#039;UMONS - Les myst\u00e8res de la relativit\u00e9 restreinte - UMONS Charleroi\" \/>\n<meta property=\"og:description\" content=\"Apr\u00e8s une longue p\u00e9riode d&#039;interruption suite \u00e0 la crise sanitaire, c&#039;est avec grand plaisir que nous avons repris le cycle de conf\u00e9rences, Les Invit\u00e9s de l\u2019UMONS, dans nos b\u00e2timents du Boulevard Joseph II \u00e0 Charleroi.  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