{"id":16821,"date":"2024-09-21T14:24:08","date_gmt":"2024-09-21T17:24:08","guid":{"rendered":"https:\/\/xequematenem.com.br\/blog\/?p=16821"},"modified":"2024-09-21T14:24:10","modified_gmt":"2024-09-21T17:24:10","slug":"questao-102-enem-ppl-2018","status":"publish","type":"post","link":"https:\/\/xequematenem.com.br\/blog\/questao-102-enem-ppl-2018\/","title":{"rendered":"Quest\u00e3o 102 &#8211; ENEM PPL 2018"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Para preparar um sopa instant\u00e2nea, uma pessoa aquece em um forno micro-ondas 500 g de \u00e1gua em uma tigela de vidro de 300 g. A temperatura inicial da tigela e da \u00e1gua era de 6 \u00b0C. Com o forno de micro-ondas funcionando a uma pot\u00eancia de 800 W, a tigela e a \u00e1gua atingiram a temperatura de 40 \u00b0C em 2,5 min. Considere que os calores espec\u00edficos do vidro e da sopa s\u00e3o, respectivamente, 0,2 cal\/g \u00b0C e 1,0 cal\/g \u00b0C , e que 1 cal = 4,2 J.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Que percentual aproximado da pot\u00eancia usada pelo micro-ondas \u00e9 efetivamente convertido em calor para o aquecimento?&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A) 11,8%&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) 45,0%&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) 57,1%&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) 66,7%&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">E) 78,4%<\/p>\n\n\n\n<p class=\"has-text-align-center has-large-font-size wp-block-paragraph\"><strong>Solu\u00e7\u00e3o<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A Pot\u00eancia \u00e9 calculada como<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"109\" height=\"56\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-579.png\" alt=\"\" class=\"wp-image-16825 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 109px; --smush-placeholder-aspect-ratio: 109\/56;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Em que \u0394t \u00e9 o tempo e a energia, essa energia \u00e9 a energia total recebida pelo conjunto sopa-vidro. Uma vez que a energia recebida foi convertida em calor, temos:\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"176\" height=\"50\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-578.png\" alt=\"\" class=\"wp-image-16824 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 176px; --smush-placeholder-aspect-ratio: 176\/50;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Em que Q \u00e9 dado por<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"98\" height=\"37\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-580.png\" alt=\"\" class=\"wp-image-16826 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 98px; --smush-placeholder-aspect-ratio: 98\/37;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">em que m \u00e9 a massa, c o calor espec\u00edfico e \u0394T a varia\u00e7\u00e3o de temperatura. Portanto,<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"309\" height=\"179\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-581.png\" alt=\"\" class=\"wp-image-16827 lazyload\" title=\"\" data-srcset=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-581.png 309w, https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-581-300x174.png 300w\" data-sizes=\"(max-width: 309px) 100vw, 309px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 309px; --smush-placeholder-aspect-ratio: 309\/179;\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Naturalmente, a pot\u00eancia convertida em calor durante o processo que levou 2,5 min, ou 150 s, pode ser calculada:&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"206\" height=\"53\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-582.png\" alt=\"\" class=\"wp-image-16828 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 206px; --smush-placeholder-aspect-ratio: 206\/53;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Se o microondas forneceu um total de 800 W, o percentual de pot\u00eancia convertida em calor \u00e9&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"141\" height=\"51\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-583.png\" alt=\"\" class=\"wp-image-16829 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 141px; --smush-placeholder-aspect-ratio: 141\/51;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Onde \u03bc<sub>ef<\/sub> \u00e9 a efici\u00eancia, dessa forma<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"169\" height=\"180\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-584.png\" alt=\"\" class=\"wp-image-16830 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 169px; --smush-placeholder-aspect-ratio: 169\/180;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Alternativa D<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Para preparar um sopa instant\u00e2nea, uma pessoa aquece em um forno micro-ondas 500 g de \u00e1gua em uma tigela de vidro de 300 g. A temperatura inicial da tigela e da \u00e1gua era de 6 \u00b0C. Com o forno de micro-ondas funcionando a uma pot\u00eancia de 800 W, a tigela e a \u00e1gua atingiram a [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[87,97],"tags":[],"area-do-conhecimento":[116,121],"assunto":[],"class_list":["post-16821","post","type-post","status-publish","format-standard","hentry","category-questoes-ppl","category-2018-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\/16821","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=16821"}],"version-history":[{"count":1,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16821\/revisions"}],"predecessor-version":[{"id":16831,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16821\/revisions\/16831"}],"wp:attachment":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media?parent=16821"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/categories?post=16821"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/tags?post=16821"},{"taxonomy":"area-do-conhecimento","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/area-do-conhecimento?post=16821"},{"taxonomy":"assunto","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/assunto?post=16821"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}