{"id":72718,"date":"2022-08-01T07:00:00","date_gmt":"2022-08-01T10:00:00","guid":{"rendered":"https:\/\/vestibulares.estrategia.com\/portal\/?p=72718"},"modified":"2024-09-26T10:05:25","modified_gmt":"2024-09-26T13:05:25","slug":"primeira-lei-da-termodinamica","status":"publish","type":"post","link":"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/primeira-lei-da-termodinamica\/","title":{"rendered":"Primeira Lei da Termodin\u00e2mica: defini\u00e7\u00e3o, f\u00f3rmula e quest\u00f5es de vestibulares"},"content":{"rendered":"<p class=\"wp-block-paragraph\">A Primeira Lei da <span id=\"urn:enhancement-25993e1f-9fab-427d-ad3e-3397af16c13b\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/termodinamica\">Termodin&acirc;mica<\/span> parte do princ&iacute;pio de conserva&ccedil;&atilde;o de <span id=\"urn:enhancement-57f6d800-047c-4f28-915e-c2843cdc9b5d\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> em um sistema termodin&acirc;mico. Por meio de <span id=\"urn:enhancement-36a74d8b-cfd6-4c5f-9db7-c2a8d4144b0c\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/formulas-matematicas\">f&oacute;rmulas matem&aacute;ticas<\/span> e embasamento te&oacute;rico, essa lei versa sobre a varia&ccedil;&atilde;o da <span id=\"urn:enhancement-36149cdf-6351-4968-a548-fc31dc8c8d42\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> interna de um sistema, depois que ele realizou trabalho, tamb&eacute;m mensurando a quantidade de <span id=\"urn:enhancement-6d97f8f5-1365-4eb0-a2c1-45b974080654\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span> absorvida.&nbsp;<p class=\"wp-block-paragraph\">Continue lendo este artigo e entenda melhor a defini&ccedil;&atilde;o e as aplica&ccedil;&otilde;es da Primeira Lei da <span id=\"urn:enhancement-746328ea-86e7-424b-89a6-e1af281bfd81\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/termodinamica\">Termodin&acirc;mica<\/span>, tanto em termos de f&oacute;rmula, como em quest&otilde;es de vestibulares que cobram esse tema.&nbsp;<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">Navegue pelo conte\u00fado<\/p>\n<\/div><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/primeira-lei-da-termodinamica\/#Como-e-a-Primeira-Lei-da-Termodinamica\" >Como &eacute; a Primeira Lei da Termodin&acirc;mica?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/primeira-lei-da-termodinamica\/#Formula-da-1a-Lei-da-Termodinamica\" >F&oacute;rmula da 1&ordf; Lei da Termodin&acirc;mica<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/primeira-lei-da-termodinamica\/#Tabela-para-a-Primeira-Lei-da-Termodinamica\" >Tabela para a Primeira Lei da Termodin&acirc;mica<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/primeira-lei-da-termodinamica\/#Questao-de-vestibular-sobre-a-1a-Lei-da-Termodinamica\" >Quest&atilde;o de vestibular sobre a 1&ordf; Lei da Termodin&acirc;mica<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/primeira-lei-da-termodinamica\/#Treine-questoes-de-fisica-para-o-vestibular\" >Treine quest&otilde;es de f&iacute;sica para o vestibular!<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/primeira-lei-da-termodinamica\/#Veja-tambem\" >Veja tamb&eacute;m:<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-como-e-a-primeira-lei-da-termodinamica\"><span class=\"ez-toc-section\" id=\"Como-e-a-Primeira-Lei-da-Termodinamica\"><\/span>Como &eacute; a Primeira Lei da Termodin&acirc;mica?<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Para entender melhor a <span id=\"urn:local-annotation-972493\" class=\"textannotation disambiguated\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/primeira-lei-da-termodinamica\">Primeira Lei da Termodin&acirc;mica<\/span>, &eacute; preciso ter em mente o Princ&iacute;pio da Conserva&ccedil;&atilde;o das <span id=\"urn:enhancement-ad2579d7-b3b7-464e-830c-42cc7347e698\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">Energia<\/span>, muito importante para diversas &aacute;reas da <span id=\"urn:enhancement-ee55c031-b802-4b82-af40-b87f856dd5b3\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/fisica\">F&iacute;sica<\/span>.&nbsp;<\/p><p class=\"wp-block-paragraph\">Esse princ&iacute;pio que rege os estudos f&iacute;sicos transmite a ideia de que, em um <a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/termodinamica\/\" target=\"_blank\">sistema termodin&acirc;mico<\/a>, a <span id=\"urn:enhancement-6865eeb5-4103-4d12-ab73-67c635b67b40\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> nunca &ldquo;some&rdquo;: ela pode ser perdida para o meio em que se encontra, absorvida ou transformada por um corpo, mas sempre se mant&eacute;m na mesma quantidade.<\/p><p class=\"wp-block-paragraph\">A partir disso, a Primeira Lei da <span id=\"urn:enhancement-2c165cef-a363-4630-91b3-9be59cfa85d8\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/termodinamica\">Termodin&acirc;mica<\/span> aparece com uma formula&ccedil;&atilde;o <span id=\"urn:enhancement-71da8ab6-5ec7-48a3-988e-d2a87c6d8f83\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/matematica\">matem&aacute;tica<\/span> que resume essas informa&ccedil;&otilde;es. Ela trata de tr&ecirc;s grandes conceitos, que est&atilde;o muito presentes nas m&aacute;quinas t&eacute;rmicas: <span id=\"urn:enhancement-3f064f61-9693-46a8-9b0d-cd58c217945f\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> interna (U), trabalho (?) e <span id=\"urn:enhancement-e2766e6b-da44-45f4-b775-9d7bd086a640\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span>(Q).<\/p><p class=\"wp-block-paragraph\">A <span id=\"urn:enhancement-e347fc92-e816-4b04-97c0-31da3b5cf92b\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> interna de um corpo &eacute; aquela que est&aacute; presente no movimento e posi&ccedil;&atilde;o dos &aacute;tomos e mol&eacute;culas que o constituem.&nbsp;<\/p><p class=\"wp-block-paragraph\">Como sabemos da <span id=\"urn:enhancement-5197a6a7-2e5e-4724-9a9e-d657e25c9441\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/quimica\">qu&iacute;mica<\/span>, quando um corpo ganha temperatura, as part&iacute;culas at&ocirc;micas tornam-se mais agitadas, por isso a <span id=\"urn:enhancement-69ea0c32-a1ec-4b06-be57-95a8402228df\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> interna desse objeto estar&aacute; aumentando. Do lado oposto, quando a temperatura decresce, a movimenta&ccedil;&atilde;o dos &aacute;tomos diminui e a <span id=\"urn:enhancement-e3b13ca2-6c04-4a5a-93da-84ce67f33bca\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> interna ser&aacute; menor.&nbsp;<\/p><p class=\"wp-block-paragraph\">O trabalho realizado por um corpo diz respeito a uma transfer&ecirc;ncia de <span id=\"urn:enhancement-9192f5ce-8861-4d70-abc3-8e585326c0bf\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> com gera&ccedil;&atilde;o de uma <span id=\"urn:enhancement-c1e0d705-9e7d-4ce5-a5a6-058229972e57\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca\">for&ccedil;a<\/span>. Por exemplo, em m&aacute;quinas a vapor, o trabalho resulta na movimenta&ccedil;&atilde;o dos pist&otilde;es &mdash; causada pela expans&atilde;o do vapor dentro do sistema.&nbsp;<\/p><p class=\"wp-block-paragraph\">Por fim, a defini&ccedil;&atilde;o de <span id=\"urn:enhancement-d027d73c-d746-4e1c-8b2f-f58d479c671f\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span> &eacute; a <span id=\"urn:enhancement-24f10647-5dc7-4778-a875-da3450dae9d6\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> em tr&acirc;nsito em um ambiente. A n&iacute;vel de vestibular, essa grandeza &eacute; estudada pela <a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/calorimetria-no-enem\/\">calorimetria<\/a>, dada sua influ&ecirc;ncia nos <span id=\"urn:enhancement-d374e26e-ec02-4f00-abe0-6f2c61f6770e\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/estados-fisicos\">estados f&iacute;sicos<\/span> de um material, principalmente.<\/p><figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"cs-embed cs-embed-responsive\"><iframe title=\"F&iacute;sica para ENEM: No&ccedil;&otilde;es de Termodin&acirc;mica - Prof. Lucas Costa\" width=\"1200\" height=\"675\" src=\"https:\/\/www.youtube.com\/embed\/57eGG4v82CY?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<\/div><\/figure><h2 class=\"wp-block-heading\" id=\"h-formula-da-1&ordf;-lei-da-termodinamica\"><span class=\"ez-toc-section\" id=\"Formula-da-1a-Lei-da-Termodinamica\"><\/span>F&oacute;rmula da 1&ordf; Lei da Termodin&acirc;mica<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Agora que voc&ecirc; j&aacute; conhece todas os conceitos fundamentais para o entendimento da Primeira Lei da <span id=\"urn:enhancement-6bbd7f86-e92b-4dce-9351-0b8b5bc9b353\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/termodinamica\">Termodin&acirc;mica<\/span>, veja a f&oacute;rmula que resume todas essas ideias:<\/p><p class=\"wp-block-paragraph\">&Delta;U = Q &ndash; ?<\/p><p class=\"wp-block-paragraph\">&Delta;U &eacute; a varia&ccedil;&atilde;o da <span id=\"urn:enhancement-c871cabb-9a87-4718-9ded-c98ad55eeac0\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> interna, medida em calorias (cal) ou Joules (J)<\/p><p class=\"wp-block-paragraph\">Q &eacute; a medida do <span id=\"urn:enhancement-52408107-5824-44c7-8dab-c2c6a4829c83\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span>, nas unidades de calorias (cal) ou Joules (J)<\/p><p class=\"wp-block-paragraph\">? &eacute; o trabalho, tamb&eacute;m medido calorias (cal) ou Joules (J)<\/p><p class=\"wp-block-paragraph\">A f&oacute;rmula transmite uma s&oacute; ideia: &ldquo;A varia&ccedil;&atilde;o da <span id=\"urn:enhancement-0422806c-df7e-4cee-bc47-efaf1c115ae8\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> interna de um corpo &eacute; dada pela diferen&ccedil;a entre a quantidade de <span id=\"urn:enhancement-5b5678d4-a575-4510-8ece-e750767d11bc\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span> que ele recebeu, menos a quantidade de <span id=\"urn:enhancement-5528662b-2ed1-461a-9988-61897c6740fe\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> que foi transferida para o meio em forma de trabalho realizado&rdquo;.<\/p><p class=\"wp-block-paragraph\">Para elucidar: imagine que uma m&aacute;quina t&eacute;rmica recebeu um <span id=\"urn:enhancement-ee649540-3c73-41fc-ab88-258b2f1aa44b\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span> de 1200J. A partir disso, foi gerado vapor, que se expandiu e movimentou um pist&atilde;o, com um trabalho de 700J.<\/p><p class=\"wp-block-paragraph\">Note que ainda v&atilde;o sobrar 1200 &ndash; 700 = 500J (quinhentos Joules) para o corpo. Isso significa que ele absorver&aacute; essa &ldquo;sobra&rdquo; em forma de <span id=\"urn:enhancement-a156733c-6f0c-478e-90dd-6a58a24ed71f\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> interna, por isso a varia&ccedil;&atilde;o da <span id=\"urn:enhancement-fc1fd984-8c4c-4da7-9596-0920b4f3da40\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> interna ser&aacute; &Delta;U=500J.&nbsp;<\/p><p class=\"wp-block-paragraph\">Entender o que isso significa tamb&eacute;m &eacute; importante para as aplica&ccedil;&otilde;es da f&oacute;rmula da Primeira Lei da <span id=\"urn:enhancement-a64d8db5-3058-40c5-9bff-511725b5448e\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/termodinamica\">Termodin&acirc;mica<\/span>:<\/p><p class=\"wp-block-paragraph\">Quando &Delta;U&gt;0, o corpo ficou com uma quantidade a mais de <span id=\"urn:enhancement-60685a31-c683-476f-8798-28c0428ef340\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span> depois de todo o processo, ou seja, sua temperatura subiu.<\/p><p class=\"wp-block-paragraph\">Se &Delta;U&lt;0, significa que o corpo recebeu uma quantidade de <span id=\"urn:enhancement-1b8a4520-cf89-4968-9577-7f779c769af8\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span> menor do que o necess&aacute;rio para a realiza&ccedil;&atilde;o do trabalho. Assim, ele cedeu mais <span id=\"urn:enhancement-d5b9305a-b59b-4ba4-8155-915f7562c545\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> do que recebeu, ou seja, sua temperatura diminuiu.&nbsp;<\/p><p class=\"wp-block-paragraph\">Quando Q&gt;0, significa que o corpo est&aacute; absorvendo\/recebendo <span id=\"urn:enhancement-23250ea9-9dd3-46c7-9567-2c7dc19fd945\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span> do meio externo. Entretanto, se Q&lt;0, ele est&aacute; enviando <span id=\"urn:enhancement-f0dcda58-5ea7-40bf-9f02-f9d5d8a5ff82\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span> para o ambiente em que est&aacute; inserido.&nbsp;<\/p><p class=\"wp-block-paragraph\">Nos casos em que o sistema expande, o ?&gt;0 e ele est&aacute; realizando trabalho sobre o meio. Mas nas situa&ccedil;&otilde;es em que o sistema sofre contra&ccedil;&atilde;o do meio: ?&lt;0.<\/p><h2 class=\"wp-block-heading\" id=\"h-tabela-para-a-primeira-lei-da-termodinamica\"><span class=\"ez-toc-section\" id=\"Tabela-para-a-Primeira-Lei-da-Termodinamica\"><\/span>Tabela para a Primeira Lei da Termodin&acirc;mica<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Veja, na tabela abaixo, um resumo sobre o comportamento de cada grandeza em situa&ccedil;&otilde;es diferentes:<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" width=\"463\" height=\"472\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2022\/07\/image-4.png\" alt=\"Primeira Lei da Termodin&acirc;mica - tabela de grandezas\" class=\"wp-image-72719\" style=\"width:524px;height:534px\"><\/figure>\n<\/div><p class=\"wp-block-paragraph\">+ Veja tamb&eacute;m:<a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/diagrama-de-fases\/\" target=\"_blank\"> Diagrama de Fases: o que &eacute; e como interpretar<\/a><\/p><h2 class=\"wp-block-heading\" id=\"h-questao-de-vestibular-sobre-a-1&ordf;-lei-da-termodinamica\"><span class=\"ez-toc-section\" id=\"Questao-de-vestibular-sobre-a-1a-Lei-da-Termodinamica\"><\/span>Quest&atilde;o de vestibular sobre a 1&ordf; Lei da Termodin&acirc;mica<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Vamos resolver juntos uma quest&atilde;o sobre a Primeira Lei da <span id=\"urn:enhancement-171c0446-0594-49d0-b24a-a4b39267ab5f\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/termodinamica\">Termodin&acirc;mica<\/span>?<\/p><p class=\"wp-block-paragraph\">UECE 2015<\/p><p class=\"wp-block-paragraph\">Em um motor de carro convencional a primeira transforma&ccedil;&atilde;o de <span id=\"urn:enhancement-94d5736d-d7ec-4388-b269-a38785ef7bde\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> em trabalho ocorre dentro do cilindro que aloja o pist&atilde;o. De modo simplificado, pode-se entender esse sistema como um cilindro fechado contendo um &ecirc;mbolo m&oacute;vel, que &eacute; o pist&atilde;o. Em um dado instante a mistura ar e combust&iacute;vel sofre combust&atilde;o for&ccedil;ando os <span id=\"urn:enhancement-b0ab9af3-0d5e-4ab2-9279-e3a9b507829b\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/gases\">gases<\/span> resultantes dessa queima a sofrerem expans&atilde;o, movimentando o pist&atilde;o ao longo do <span id=\"urn:enhancement-7bfd8bcd-0c45-4038-b7c4-17b33242cf24\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/eixo-de-rotacao\">eixo<\/span> do cilindro.<\/p><p class=\"wp-block-paragraph\">&Eacute; correto afirmar que a energia t&eacute;rmica contida nos <span id=\"urn:enhancement-54c19ac9-ba36-438e-9216-7556718fc9c0\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/gases\">gases<\/span> imediatamente ap&oacute;s a combust&atilde;o &eacute;<\/p><p class=\"wp-block-paragraph\">a) parte transferida na forma de <span id=\"urn:enhancement-4b05b3ee-eec8-4bb2-8620-dfbeca5e2999\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span> para o ambiente e parte convertida em <span id=\"urn:enhancement-87545f41-1bd6-45ae-9157-790e95511e1f\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia-cinetica\">energia cin&eacute;tica<\/span> do pist&atilde;o.<br>b) totalmente transferida como <span id=\"urn:enhancement-1e217bbd-0aa2-4afd-bd80-f4e71114496a\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span> para o ambiente.<br>c) totalmente convertida em trabalho sobre o pist&atilde;o.<br>d) parte convertida em trabalho sobre o pist&atilde;o e o restante convertida em <span id=\"urn:enhancement-73a4b9b4-b53d-4c54-ab6d-61cfde1b687d\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia-cinetica\">energia cin&eacute;tica<\/span> tamb&eacute;m do pist&atilde;o.<\/p><p class=\"wp-block-paragraph\">O enunciado trata, puramente, da Primeira Lei da <span id=\"urn:enhancement-798ba68e-bec5-470c-92ea-a9796f50141a\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/termodinamica\">Termodin&acirc;mica<\/span>. Os <span id=\"urn:enhancement-ecd4e37b-6a7b-4974-9ad4-32c6c14f42e3\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/gases\">gases<\/span> que empurram o pist&atilde;o possuem certa energia t&eacute;rmica, que ser&aacute; transferida para os pist&atilde;o, gerando trabalho. Mas se lembrarmos a f&oacute;rmula &Delta;U = Q &ndash; ?, observamos que essa <span id=\"urn:enhancement-ae2885d8-58b5-4360-8915-7db0a897616e\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> tamb&eacute;m se altera devido a uma quantidade de <span id=\"urn:enhancement-2d6f490b-7e87-4708-afc4-bd5c1f98d2fd\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span> que ser&aacute; perdida no ambiente.<\/p><p class=\"wp-block-paragraph\">Vale ressaltar que nenhuma m&aacute;quina t&eacute;rmica consegue converter puramente o <span id=\"urn:enhancement-533dbb07-90b7-4e81-ad21-9454c6561301\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/calor\">calor<\/span> em trabalho, sem dissipa&ccedil;&atilde;o de <span id=\"urn:enhancement-a62864f8-fcfc-4076-911b-f54c0616eaa7\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/energia\">energia<\/span> para o meio. Assim, a alternativa correta &eacute; a letra A.<\/p><h2 class=\"wp-block-heading\" id=\"h-treine-questoes-de-fisica-para-o-vestibular\"><span class=\"ez-toc-section\" id=\"Treine-questoes-de-fisica-para-o-vestibular\"><\/span>Treine quest&otilde;es de f&iacute;sica para o vestibular!<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Um bom desempenho em quest&otilde;es exatas depende, principalmente, de conceitos bem consolidados e do desenvolvimento de racioc&iacute;nio l&oacute;gico. Para treinar essas habilidades, &eacute; importante fazer muitas quest&otilde;es <span id=\"urn:enhancement-992c7357-56be-4107-8c9c-ba4d49c7fca8\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/fisica\">f&iacute;sica<\/span>, <span id=\"urn:enhancement-afa78985-66c0-41f3-bddf-ee13add227de\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/quimica\">qu&iacute;mica<\/span> e <span id=\"urn:enhancement-cf9b83ad-f9c2-445a-9f4e-8b9dd0d81b5f\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/matematica\">matem&aacute;tica<\/span>. Conhe&ccedil;a o<a href=\"https:\/\/vestibulares.estrategiaeducacional.com.br\/\" target=\"_blank\"> banco de quest&otilde;es do Estrat&eacute;gia Vestibulares<\/a> e tenha acesso a uma diversidade de exerc&iacute;cios para refor&ccedil;ar seu conhecimento!<\/p><p class=\"wp-block-paragraph\"><a id=\"cta\" class=\"cta-imagem\" href=\"https:\/\/vestibulares.estrategia.com\/cursos\/\" target=\"blank\">\n                <img decoding=\"async\" width=\"100%\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/12\/EV4.jpg\" alt=\"CTA - Estrat\u00e9gia Vestibulares 4\" title=\"CTA - Estrat\u00e9gia Vestibulares 4\">\n        <\/a>\n\n\n\n<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Veja-tambem\"><\/span>Veja tamb&eacute;m:<span class=\"ez-toc-section-end\"><\/span><\/h2><ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/fisica\/leis-de-newton\/\">Leis de Newton: princ&iacute;pios, conceitos e aplica&ccedil;&otilde;es<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/fisica\/gravidade\/\">Gravidade: o que &eacute;, valor e muito mais!<\/a>&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/fisica\/termodinamica\/\">Termodin&acirc;mica: o que &eacute;, f&oacute;rmulas e leis<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/fisica\/calorimetria-no-enem\/\">Calorimetria no Enem: como cai?<\/a>&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/fisica\/hidrostatica\/\">Hidrost&aacute;tica: press&atilde;o, densidade e f&oacute;rmulas<\/a>&nbsp;&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/fisica\/principio-de-arquimedes\/\">Princ&iacute;pio de Arquimedes: o que &eacute;, peso aparente e f&oacute;rmulas<\/a>&nbsp;<\/li>\n\n\n\n<li>&#8203;&#8203;<a href=\"https:\/\/vestibulares.estrategia.com\/portal\/fisica\/prova-fisica-2-fase-unicamp-2020\/\">Resolu&ccedil;&atilde;o da prova de F&iacute;sica da 2&ordf; Fase da Unicamp 2020<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/fisica\/prova-fuvest-2020-fisica\/\">Resolu&ccedil;&atilde;o Comentada da prova de F&iacute;sica FUVEST 2020<\/a><\/li>\n<\/ul><\/p>\n","protected":false},"excerpt":{"rendered":"A Primeira Lei da Termodin&acirc;mica parte do princ&iacute;pio de conserva&ccedil;&atilde;o de energia em um sistema termodin&acirc;mico. Por meio&hellip;\n","protected":false},"author":23,"featured_media":73696,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[],"class_list":["post-72718","post","type-post","status-publish","format-standard","has-post-thumbnail","category-fisica"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Primeira Lei da Termodin\u00e2mica: defini\u00e7\u00e3o, f\u00f3rmula e quest\u00f5es<\/title>\n<meta name=\"description\" content=\"A Primeira Lei da Termodin\u00e2mica trata sobre a realiza\u00e7\u00e3o de trabalho a partir do recebimento do calor: conhe\u00e7a as teorias e f\u00f3rmulas!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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