{"id":3469,"date":"2017-09-21T12:45:32","date_gmt":"2017-09-21T10:45:32","guid":{"rendered":"http:\/\/www.zsvltava.cz\/fyzika\/?p=3469"},"modified":"2024-12-27T22:26:00","modified_gmt":"2024-12-27T21:26:00","slug":"jak-velky-je-jeden-joule","status":"publish","type":"post","link":"https:\/\/www.zsvltava.cz\/fyzika\/?p=3469","title":{"rendered":"Jak velk\u00fd je jeden Joule?"},"content":{"rendered":"<p><strong>Co maj\u00ed spole\u010dn\u00e9ho zvednut\u00ed lahve, kopnut\u00ed do m\u00ed\u010de nebo bliknut\u00ed \u017e\u00e1rovky? V\u0161echny tyto \u010dinnosti odhaluj\u00ed tajemstv\u00ed energie ukryt\u00e9 v jedin\u00e9m joulu. Jak velk\u00fd je vlastn\u011b 1 joul a co v\u0161echno dok\u00e1\u017ee? Poj\u010fme to zjistit!<\/strong><\/p>\n<p>Energii 1 Joule si snadno odvod\u00edme ze vztahu pro v\u00fdpo\u010det energie nebo pr\u00e1ce.<\/p>\n<p>Ze vztahu pro <a href=\"http:\/\/www.zsvltava.cz\/fyzika\/?p=3450\">pr\u00e1ci<\/a>:<\/p>\n<p>Pokud <span style=\"display: inline-block; border: 1px solid grey; padding: .2em 1em;\">W = F . s<\/span> tak <span style=\"display: inline-block; border: 1px solid grey; padding: .2em 1em;\">1 J = 1 N . 1 m<\/span><\/p>\n<p><strong>1 Joule je p\u016fsoben\u00ed s\u00edly o velikosti 1 Newtonu po dr\u00e1ze 1 metr<\/strong>. <br \/>(Za p\u0159edpokladu, \u017ee sm\u011br p\u016fsoben\u00ed je shodn\u00fd se sm\u011brem pohybu.)<\/p>\n<p>Jednodu\u0161\u0161\u00ed bude p\u0159edstava podle dosazen\u00ed do vztahu pro v\u00fdpo\u010det<br \/>\npotenci\u00e1ln\u00ed <a href=\"http:\/\/www.zsvltava.cz\/fyzika\/?p=1601\">energie<\/a>. (Jedn\u00e1 se vlastn\u011b o t\u00fd\u017e vztah.)<\/p>\n<p><span style=\"display: inline-block; border: 1px solid grey; padding: .2em 1em;\">E = m . g . h<\/span> &rArr; <span style=\"display: inline-block; border: 1px solid grey; padding: .2em 1em;\">1 J = 1 kg . 10 m\/s<sup>2<\/sup> . 0,1 m<\/span><\/p>\n<p><strong>1 Joule je energie pot\u0159ebn\u00e1 ke zvednut\u00ed 1kg t\u011blesa do v\u00fd\u0161ky 10 cm<\/strong>.<br \/>\n<em><small>P\u0159esn\u011bj\u0161\u00ed hodnota t\u00edhov\u00e9ho zrychlen\u00ed g je 9,81 m\/s<sup>2<\/sup><\/small>.<\/em><\/p>\n<p>Stejn\u011b tak z kinetick\u00e9 energie:<\/p>\n<p><span style=\"display: inline-block; border: 1px solid grey; padding: .2em 1em;\">E = 1\/2 . m . v<sup>2<\/sup><\/span> &rArr; <span style=\"display: inline-block; border: 1px solid grey; padding: .2em 1em;\">1 J = 0,5 . 2 kg . 1 m<sup>2<\/sup>\/s<sup>2<\/sup><\/span><\/p>\n<p><strong>1 Joule je energie t\u011blesa o hmotnosti 2 kg pohybuj\u00edc\u00edho se rychlost\u00ed 3,6 km\/h<\/strong>.<\/p>\n<p><a href=\"https:\/\/www.zsvltava.cz\/fyzika\/wp-content\/uploads\/2017\/09\/james-prescott-joule-2.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.zsvltava.cz\/fyzika\/wp-content\/uploads\/2017\/09\/james-prescott-joule-2.png\" alt=\"\" width=\"1458\" height=\"750\" class=\"aligncenter size-full wp-image-3483\" srcset=\"https:\/\/www.zsvltava.cz\/fyzika\/wp-content\/uploads\/2017\/09\/james-prescott-joule-2.png 1458w, https:\/\/www.zsvltava.cz\/fyzika\/wp-content\/uploads\/2017\/09\/james-prescott-joule-2-645x332.png 645w, https:\/\/www.zsvltava.cz\/fyzika\/wp-content\/uploads\/2017\/09\/james-prescott-joule-2-768x395.png 768w, https:\/\/www.zsvltava.cz\/fyzika\/wp-content\/uploads\/2017\/09\/james-prescott-joule-2-1024x527.png 1024w\" sizes=\"auto, (max-width: 1458px) 100vw, 1458px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Co maj\u00ed spole\u010dn\u00e9ho zvednut\u00ed lahve, kopnut\u00ed do m\u00ed\u010de nebo bliknut\u00ed \u017e\u00e1rovky? V\u0161echny tyto \u010dinnosti odhaluj\u00ed tajemstv\u00ed energie ukryt\u00e9 v jedin\u00e9m joulu. Jak velk\u00fd je vlastn\u011b &#8230;. <\/p>\n","protected":false},"author":1,"featured_media":3483,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42,46,44],"tags":[23,71],"class_list":["post-3469","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-8-rocnik-2","category-energie","category-prace-a-energie","tag-reseny-priklad","tag-vysvetleni"],"_links":{"self":[{"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/posts\/3469","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3469"}],"version-history":[{"count":0,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/posts\/3469\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/media\/3483"}],"wp:attachment":[{"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3469"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3469"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3469"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}