{"id":1272,"date":"2012-08-08T12:35:33","date_gmt":"2012-08-08T10:35:33","guid":{"rendered":"http:\/\/www.zsvltava.cz\/fyzika\/?p=1272"},"modified":"2025-04-10T07:45:51","modified_gmt":"2025-04-10T05:45:51","slug":"vypocet-vztlakove-sily","status":"publish","type":"post","link":"https:\/\/www.zsvltava.cz\/fyzika\/?p=1272","title":{"rendered":"P\u016fl tuctu p\u0159\u00edklad\u016f na v\u00fdpo\u010det vztlakov\u00e9 s\u00edly"},"content":{"rendered":"<ol type=\"1\" class=\"ns_priklady\">\n<li>D\u00edky p\u016fsoben\u00ed vztlakov\u00e9 s\u00edly se zdaj\u00ed b\u00fdt v\u011bci ve vod\u011b leh\u010d\u00ed. <strong>O kolik jsme pono\u0159eni po krk v mo\u0159i zd\u00e1nliv\u011b leh\u010d\u00ed?<\/strong><br \/>\nV\u00edme: hustota lidsk\u00e9ho t\u011bla je 985 kg\/m<sup>3<\/sup>, hustota mo\u0159sk\u00e9 vody je 1026  kg\/m<sup>3<\/sup>. Pr\u016fm\u011brn\u00e1 hmotnost hlavy je 4,6 kg.\n<\/li>\n<li>\n <strong>Jak velk\u00e1 vztlakov\u00e1 s\u00edla p\u016fsob\u00ed na vor<\/strong>, na kter\u00e9m sed\u00ed trose\u010dn\u00edk o hmotnosti 70 kg? Vor, kter\u00fd je pono\u0159en 8 cm pod hladinu vody tvo\u0159\u00ed 4 d\u0159ev\u011bn\u00e9 tr\u00e1my o rozm\u011brech: 120&nbsp;cm&nbsp;&times;&nbsp;15&nbsp;cm&nbsp;&times;&nbsp;15&nbsp;cm.\n<\/li>\n<li><strong>Jakou hmotnost\u00ed<\/strong> bude t\u0159eba zat\u00ed\u017eit pod vodou b\u00f3ji o objemu 35 000 cm<sup>3<\/sup> a hustot\u011b 200&nbsp;kg\/m<sup>3<\/sup>, pokud budeme cht\u00edt zabr\u00e1nit aby vyplavala a z\u016fstala zcela pod hladinou?<\/li>\n<li>Namaluj a popi\u0161 situaci z p\u0159\u00edkladu \u010d. 3 v grafick\u00e9m editoru.<\/li>\n<li>Lo\u010f Titanic, kter\u00e1 se p\u0159ed v\u00edce ne\u017e sto lety potopila, le\u017e\u00ed v hloubce 12 600 stop. <strong>Jak\u00fd panuje v t\u00e9to hloubce hydrostatick\u00fd tlak?<\/strong> <em>1 stopa = 30,48 cm<\/em><\/li>\n<li>Tv\u016frce filmu Titanic &#8211; James Cameron sestoupil 26. b\u0159ezna se svou ponorkou na dno Mari\u00e1nsk\u00e9ho p\u0159\u00edkopu &#8211; nejhlub\u0161\u00edho m\u00edsta Zem\u011b &#8211; do hloubky 10 898 metr\u016f. Po\u0159izoval z\u00e1b\u011bry dna pomoc\u00ed speci\u00e1ln\u00edch 3D kamer. <strong>Jak\u00e9 hydrostatick\u00e9 tlakov\u00e9 s\u00edle<\/strong> musely odolat objektivy kamer, jejich\u017e povrch byl p\u0159ibli\u017en\u011b 30 cm<sup>2<\/sup>?<br \/>\n<br \/><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.zsvltava.cz\/fyzika\/wp-content\/uploads\/2012\/03\/Challenger-Deep-Submarine-and-James-Cameron_641344.jpg\" alt=\"\" title=\"Challenger Deep Submarine\" width=\"475\" height=\"275\"\/>\n<\/li>\n<li>Iluzionista chce p\u0159edv\u00e9st trik, kter\u00fd spo\u010d\u00edv\u00e1 v tom, \u017ee vytvo\u0159\u00ed dojem, \u017ee stoj\u00ed na vodn\u00ed hladin\u011b. Chce k tomu pou\u017e\u00edt poylstyr\u00e9n, kter\u00fd m\u00e1 hustotu 20 kg\/m<sup>3<\/sup>. <strong>Jak\u00e9 mno\u017estv\u00ed (objem) polystyr\u00e9nu bude pot\u0159ebovat<\/strong>, kdy\u017e v\u00e1\u017e\u00ed 76 kg?<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>D\u00edky p\u016fsoben\u00ed vztlakov\u00e9 s\u00edly se zdaj\u00ed b\u00fdt v\u011bci ve vod\u011b leh\u010d\u00ed. O kolik jsme pono\u0159eni po krk v mo\u0159i zd\u00e1nliv\u011b leh\u010d\u00ed? V\u00edme: hustota lidsk\u00e9ho t\u011bla &#8230;. <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[90,40,59],"tags":[38,32],"class_list":["post-1272","post","type-post","status-publish","format-standard","hentry","category-kapaliny","category-priklady-pro-7-rocnik","category-tlak","tag-hydrostatika","tag-objem-a-hustota"],"_links":{"self":[{"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/posts\/1272","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=1272"}],"version-history":[{"count":0,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/posts\/1272\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1272"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1272"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1272"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}