{"id":3504,"date":"2025-09-25T08:00:31","date_gmt":"2025-09-25T06:00:31","guid":{"rendered":"http:\/\/www.zsvltava.cz\/fyzika\/?p=3504"},"modified":"2025-10-09T08:23:02","modified_gmt":"2025-10-09T06:23:02","slug":"vykon-jako-fyzikalni-velicina","status":"publish","type":"post","link":"https:\/\/www.zsvltava.cz\/fyzika\/?p=3504","title":{"rendered":"V\u00fdkon jako fyzik\u00e1ln\u00ed veli\u010dina"},"content":{"rendered":"

V\u00fdkon ozna\u010duejem velk\u00fdm P (power), jednotkou je Watt<\/a>.
\nV\u00fdkon ur\u010duje mno\u017estv\u00ed vykonan\u00e9 pr\u00e1ce za jednotku \u010dasu<\/strong>.<\/p>\n

  <\/span>   <\/span>\"\[<\/p>\n

Uveden\u00fd vztah je zcela v souladu s t\u00edm, jak v\u00fdkon vn\u00edm\u00e1me v b\u011b\u017en\u00e9m \u017eivot\u011b. P\u0159edstavme si 2 pracanty.<\/p>\n

\"\"<\/a>
\n(Autor obr\u00e1zku, d\u00edky: Vil\u00e9m Hor\u00e1\u010dek (Flickr)<\/small>)<\/p>\n

Maj\u00ed stejnou pr\u00e1ci. 1 z pracant\u016f zvl\u00e1dne svoji pr\u00e1ci 2x rychleji – tedy 2x d\u0159\u00edve.<\/p>\n

Pro konkr\u00e9tn\u011bj\u0161\u00ed p\u0159edstavu si dosa\u010fme: <\/p>\n

Oba vykonaj\u00ed stejnou pr\u00e1ci: W1<\/sub> = W2<\/sub> = 120 J
\nPrvn\u00ed pracant za t1<\/sub> = 60 s
\nDruh\u00fd pracant za polovi\u010dn\u00ed \u010das, tedy t2<\/sub> = 30 s<\/p>\n

  <\/span>   <\/span>\"\[<\/p>\n

  <\/span>   <\/span>\"\[<\/p>\n

  <\/span>   <\/span>\"\[(P_2=2.P_1)\]\"<\/p>\n

Stejn\u00e1 pr\u00e1ce za krat\u0161\u00ed \u010das = VY\u0160\u0160\u00cd V\u00ddKON.<\/strong><\/p>\n

Elegantn\u011bj\u0161\u00ed – obecn\u00e9 \u0159e\u0161en\u00ed:<\/h2>\n

  <\/span>   <\/span>\"\[P_1=\frac{W}{2t} \, \Rightarrow \, W=P_1.2t\]\"<\/p>\n

  <\/span>   <\/span>\"\[P_2=\frac{W}{t}=\frac{P_1.2t}{t}=2.P_1\]\"<\/p>\n

P2<\/sub> = 2.P1<\/sub> <\/p>\n

Znamen\u00e1, \u017ee v\u00fdkon druh\u00e9ho je 2 kr\u00e1t v\u011bt\u0161\u00ed ne\u017e v\u00fdkon prvn\u00edho (druh\u00fd pracoval 2x rychleji).<\/p>\n

– P\u0159\u00edklady k procvi\u010den\u00ed<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

V\u00fdkon ozna\u010duejem velk\u00fdm P (power), jednotkou je Watt. V\u00fdkon ur\u010duje mno\u017estv\u00ed vykonan\u00e9 pr\u00e1ce za jednotku \u010dasu.     Uveden\u00fd vztah je zcela v souladu s …. <\/p>\n","protected":false},"author":1,"featured_media":3511,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42,44],"tags":[71],"class_list":["post-3504","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-8-rocnik-2","category-prace-a-energie","tag-vysvetleni"],"_links":{"self":[{"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/posts\/3504","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=3504"}],"version-history":[{"count":11,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/posts\/3504\/revisions"}],"predecessor-version":[{"id":6168,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/posts\/3504\/revisions\/6168"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=\/wp\/v2\/media\/3511"}],"wp:attachment":[{"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3504"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3504"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zsvltava.cz\/fyzika\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3504"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}