{"id":1076,"date":"2012-08-21T13:26:29","date_gmt":"2012-08-21T11:26:29","guid":{"rendered":"http:\/\/www.zsvltava.cz\/fyzika\/?p=1076"},"modified":"2025-04-09T09:53:14","modified_gmt":"2025-04-09T07:53:14","slug":"priklady-na-vypocet-tlaku","status":"publish","type":"post","link":"https:\/\/www.zsvltava.cz\/fyzika\/?p=1076","title":{"rendered":"P\u0159\u00edklady na v\u00fdpo\u010det tlaku"},"content":{"rendered":"
    \n
  1. Jak\u00fdm tlakem p\u016fsob\u00ed\u0161 na zem, kdy\u017e stoj\u00ed\u0161?<\/li>\n
  2. K chozen\u00ed po sn\u011bhu se pou\u017e\u00edvaj\u00ed sn\u011b\u017enice. Maj\u00ed za \u00fakol zv\u011bt\u0161it plochu stopy. Pro\u010d? <\/li>\n
  3. St\u016fl m\u00e1 hmotnost 5 kg. Nohy stolu maj\u00ed \u010dtvercov\u00fd pr\u016f\u0159ez. U desky stolu m\u011b\u0159\u00ed hrana nohy 5 cm, u zem\u011b 4 cm. Jak\u00fdm tlakem p\u016fsob\u00ed st\u016fl na podlahu?<\/li>\n
  4. Vypo\u010d\u00edtej jak\u00fdm tlakem p\u016fsob\u00ed na zem d\u0159ev\u011bn\u00fd sloup z habru.
    M\u00e1 tvar kv\u00e1dru o rozm\u011brech 2 m x 30 cm x 30 cm.<\/li>\n
  5. \u0160pi\u010dka h\u0159eb\u00edku m\u00e1 obsah 0,1 mm2<\/sup>.\n
      \n
    1. Jak\u00fdm tlakem p\u016fsob\u00ed h\u0159eb\u00edk, kdy\u017e na n\u011bj dopadne kladivo silou 500 N?<\/li>\n
    2. Kdy\u017e p\u0159itla\u010d\u00edme \u0161pi\u010dku h\u0159eb\u00edku na prst, dok\u00e1\u017ee proniknout k\u016f\u017e\u00ed. Kdy\u017e stejnou silou p\u0159itla\u010d\u00edme opa\u010dn\u00fd konec, k\u016f\u017e\u00ed nepronikne. Pro\u010d?<\/li>\n<\/ol>\n<\/li>\n
    3. Tlak vzduchu v prost\u0159ed\u00ed, ve kter\u00e9m \u017eijeme, je p\u0159ibli\u017en\u011b 100 000 Pa. Plocha k\u016f\u017ee lidsk\u00e9ho t\u011bla je mezi 1,6 a 1,8 m\u00b2.\n
        \n
      1. Jakou silou na n\u00e1s prost\u0159ed\u00ed p\u016fsob\u00ed?<\/li>\n
      2. K p\u016fsoben\u00ed jak\u00e9 hmotnosti lze tuto s\u00edlu p\u0159irovnat?<\/li>\n<\/ol>\n<\/li>\n
      3. Vypo\u010dti p\u0159edchoz\u00ed p\u0159\u00edklad pro prost\u0159ed\u00ed na planet\u011b Mars. V sou\u010dasn\u00e9 dob\u011b je atmosf\u00e9rick\u00fd tlak na Marsu asi 6 a\u017e 7 milibar\u016f. Jednotka 1 bar odpov\u00edd\u00e1 10 000 Pa.<\/li>\n
      4. B\u011b\u017en\u00e1 pevnost skla v tlaku je kolem 500 MPa. (Hodnota ud\u00e1v\u00e1, jak\u00e9mu tlaku je sklo schopn\u00e9 odolat.)
        Jak t\u011b\u017ek\u00e9mu p\u0159edm\u011btu odol\u00e1 sklen\u011bn\u00e1 desti\u010dka o rozm\u011brech 15 cm × 15cm?<\/li>\n
      5. Z\u00e1kladn\u00edho vztahu pro v\u00fdpo\u010det tlaku vyu\u017e\u00edv\u00e1me, kdy\u017e brous\u00edme no\u017ee a sekery. Jak?<\/li>\n
      6. Vysv\u011btli, pro\u010d nen\u00ed pravda, \u017ee kdy\u017e led zamrzl\u00e9ho rybn\u00edku udr\u017eel \u010dlov\u011bka o v\u00e1ze 70 kg, mus\u00ed zaru\u010den\u011b udr\u017eet n\u011bkoho, kdo v\u00e1\u017e\u00ed pouze 50 kg.<\/li>\n<\/ol>\n

        + 11 \u0159e\u0161en\u00fdch p\u0159\u00edklad\u016f – ze Z\u0160 Jesenice<\/a>
        \n+         Kombinace zad\u00e1n\u00ed (8 + 1 p\u0159\u00edklad na v\u00fdpo\u010det tlaku bez zobrazen\u00e9ho \u0159e\u0161en\u00ed)<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

        Jak\u00fdm tlakem p\u016fsob\u00ed\u0161 na zem, kdy\u017e stoj\u00ed\u0161? K chozen\u00ed po sn\u011bhu se pou\u017e\u00edvaj\u00ed sn\u011b\u017enice. Maj\u00ed za \u00fakol zv\u011bt\u0161it plochu stopy. Pro\u010d? St\u016fl m\u00e1 hmotnost 5 …. <\/p>\n","protected":false},"author":1,"featured_media":2606,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[40,35,59],"tags":[],"class_list":["post-1076","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-priklady-pro-7-rocnik","category-sila","category-tlak"],"_links":{"self":[{"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/posts\/1076","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=1076"}],"version-history":[{"count":0,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/posts\/1076\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/media\/2606"}],"wp:attachment":[{"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1076"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1076"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1076"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}