{"id":16975,"date":"2024-09-21T16:34:08","date_gmt":"2024-09-21T19:34:08","guid":{"rendered":"https:\/\/xequematenem.com.br\/blog\/?p=16975"},"modified":"2024-09-21T16:34:10","modified_gmt":"2024-09-21T19:34:10","slug":"questao-124-enem-ppl-2017","status":"publish","type":"post","link":"https:\/\/xequematenem.com.br\/blog\/questao-124-enem-ppl-2017\/","title":{"rendered":"Quest\u00e3o 124 &#8211; ENEM PPL 2017"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">O aproveitamento da luz solar como fonte de energia renov\u00e1vel tem aumentado significativamente nos \u00faltimos anos. Uma das aplica\u00e7\u00f5es \u00e9 o aquecimento de \u00e1gua (\u03c1<sub>\u00e1gua<\/sub>= 1 kg\/L) para uso residencial. Em um local, a intensidade da radia\u00e7\u00e3o solar efetivamente captada por um painel solar com \u00e1rea de 1 m<sup>2<\/sup> \u00e9 de 0,03 kW\/m2 . O valor do calor espec\u00edfico da \u00e1gua \u00e9 igual 4,2 kJ\/(kg \u00b0C). Nessa situa\u00e7\u00e3o, em quanto tempo \u00e9 poss\u00edvel aquecer 1 litro de \u00e1gua de 20 \u00b0C at\u00e9 70 \u00b0C?&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) 490 s&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) 2 800 s&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) 6 300 s&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) 7 000 s&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">E) 9 800 s<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Solu\u00e7\u00e3o<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O fluxo de calor devido \u00e0 varia\u00e7\u00e3o de temperatura \u00e9 dado pela quantidade de calor dividido pelo tempo:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"132\" height=\"131\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-661.png\" alt=\"\" class=\"wp-image-16976 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 132px; --smush-placeholder-aspect-ratio: 132\/131;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Podemos relacionar a massa com sua densidade e volume m = \u03c1 \u00d7 V&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"98\" height=\"55\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-662.png\" alt=\"\" class=\"wp-image-16977 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 98px; --smush-placeholder-aspect-ratio: 98\/55;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">a quantidade de calor trocada ao se aquecer 1 litro de \u00e1gua de 20 \u00b0C at\u00e9 70 \u00b0C:&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"449\" height=\"32\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-663.png\" alt=\"\" class=\"wp-image-16978 lazyload\" title=\"\" data-srcset=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-663.png 449w, https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-663-300x21.png 300w\" data-sizes=\"(max-width: 449px) 100vw, 449px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 449px; --smush-placeholder-aspect-ratio: 449\/32;\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A placa possui \u00e1rea de 1 m<sup>2<\/sup>. Ent\u00e3o, dada sua Incid\u00eancia de 0,03 kW\/m\u00b2 sua pot\u00eancia \u00e9&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"198\" height=\"152\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-664.png\" alt=\"\" class=\"wp-image-16979 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 198px; --smush-placeholder-aspect-ratio: 198\/152;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Agora, isolando \u0394t podemos substituir os valores\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"251\" height=\"162\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-665.png\" alt=\"\" class=\"wp-image-16980 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 251px; --smush-placeholder-aspect-ratio: 251\/162;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Alternativa D<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>O aproveitamento da luz solar como fonte de energia renov\u00e1vel tem aumentado significativamente nos \u00faltimos anos. Uma das aplica\u00e7\u00f5es \u00e9 o aquecimento de \u00e1gua (\u03c1\u00e1gua= 1 kg\/L) para uso residencial. Em um local, a intensidade da radia\u00e7\u00e3o solar efetivamente captada por um painel solar com \u00e1rea de 1 m2 \u00e9 de 0,03 kW\/m2 . O [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[87,96],"tags":[],"area-do-conhecimento":[116,121],"assunto":[],"class_list":["post-16975","post","type-post","status-publish","format-standard","hentry","category-questoes-ppl","category-2017-questoes-ppl","area-do-conhecimento-ciencias-da-natureza-e-suas-tecnologias","area-do-conhecimento-fisica"],"_links":{"self":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16975","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/comments?post=16975"}],"version-history":[{"count":1,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16975\/revisions"}],"predecessor-version":[{"id":16981,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16975\/revisions\/16981"}],"wp:attachment":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media?parent=16975"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/categories?post=16975"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/tags?post=16975"},{"taxonomy":"area-do-conhecimento","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/area-do-conhecimento?post=16975"},{"taxonomy":"assunto","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/assunto?post=16975"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}