{"id":16234,"date":"2024-09-19T10:48:39","date_gmt":"2024-09-19T13:48:39","guid":{"rendered":"https:\/\/xequematenem.com.br\/blog\/?p=16234"},"modified":"2024-09-19T10:48:41","modified_gmt":"2024-09-19T13:48:41","slug":"questao-116-enem-2022","status":"publish","type":"post","link":"https:\/\/xequematenem.com.br\/blog\/questao-116-enem-2022\/","title":{"rendered":"Quest\u00e3o 116 &#8211; ENEM 2022"},"content":{"rendered":"\n<p>O manual de uma ducha el\u00e9trica informa que seus tr\u00eas n\u00edveis de aquecimento (morno, quente e superquente) apresentam as seguintes varia\u00e7\u00f5es de temperatura da \u00e1gua em fun\u00e7\u00e3o de sua vaz\u00e3o:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"312\" height=\"139\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-320.png\" alt=\"\" class=\"wp-image-16235 lazyload\" title=\"\" data-srcset=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-320.png 312w, https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-320-300x134.png 300w\" data-sizes=\"(max-width: 312px) 100vw, 312px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 312px; --smush-placeholder-aspect-ratio: 312\/139;\" \/><\/figure>\n\n\n\n<p>Utiliza-se um disjuntor para proteger o circuito dessa ducha contra sobrecargas el\u00e9tricas em qualquer n\u00edvel de aquecimento. Por padr\u00e3o, o disjuntor \u00e9 especificado pela corrente nominal igual ao m\u00faltiplo de 5 A imediatamente superior \u00e0 corrente m\u00e1xima do circuito. Considere que a ducha deve ser ligada em 220 V e que toda a energia \u00e9 dissipada atrav\u00e9s da resist\u00eancia do chuveiro e convertida em energia t\u00e9rmica transferida para a \u00e1gua, que apresenta calor espec\u00edfico de 4,2 Jg\u00b0C e densidade de 1 000 gl . O disjuntor adequado para a prote\u00e7\u00e3o dessa ducha \u00e9 especificado por:<\/p>\n\n\n\n<p>A) 60 A&nbsp;<\/p>\n\n\n\n<p>B) 30 A&nbsp;<\/p>\n\n\n\n<p>C) 20 A&nbsp;<\/p>\n\n\n\n<p>D) 10 A&nbsp;<\/p>\n\n\n\n<p>E) 5 A<\/p>\n\n\n\n<p class=\"has-text-align-center has-large-font-size\"><strong>Solu\u00e7\u00e3o<\/strong><\/p>\n\n\n\n<p>Para esse exerc\u00edcio, vamos precisar das seguintes equa\u00e7\u00f5es<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"202\" height=\"50\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-328.png\" alt=\"\" class=\"wp-image-16244 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 202px; --smush-placeholder-aspect-ratio: 202\/50;\"><\/figure>\n\n\n\n<p>onde Q \u00e9 a quantidade de calor, m \u00e9 a massa, c \u00e9 o calor espec\u00edfico, T \u00e9 a temperatura, P \u00e9 a pot\u00eancia e t \u00e9 o tempo.<\/p>\n\n\n\n<p>Substituindo Q na equa\u00e7\u00e3o da pot\u00eancia, temos:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"121\" height=\"47\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-327.png\" alt=\"\" class=\"wp-image-16243 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 121px; --smush-placeholder-aspect-ratio: 121\/47;\"><\/figure>\n\n\n\n<p>Teremos que converter a massa em fun\u00e7\u00e3o de sua densidade<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"110\" height=\"84\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-326.png\" alt=\"\" class=\"wp-image-16242 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 110px; --smush-placeholder-aspect-ratio: 110\/84;\"><\/figure>\n\n\n\n<p>Dessa forma:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"168\" height=\"58\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-325.png\" alt=\"\" class=\"wp-image-16241 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 168px; --smush-placeholder-aspect-ratio: 168\/58;\"><\/figure>\n\n\n\n<p>Em que V\/t \u00e9 a vaz\u00e3o da \u00e1gua (Z)<\/p>\n\n\n\n<p>\u00a0 \u00a0 <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"175\" height=\"43\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-324.png\" alt=\"\" class=\"wp-image-16240 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 175px; --smush-placeholder-aspect-ratio: 175\/43;\"><\/figure>\n\n\n\n<p>A vaz\u00e3o de 3 L\/min deve ser convertida para segundos, para se enquadrar no SI (Sistema Internacional de unidades).&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"207\" height=\"121\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-323.png\" alt=\"\" class=\"wp-image-16239 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 207px; --smush-placeholder-aspect-ratio: 207\/121;\"><\/figure>\n\n\n\n<p>Assim a pot\u00eancia apa o superquente ser\u00e1:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"202\" height=\"52\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-322.png\" alt=\"\" class=\"wp-image-16238 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 202px; --smush-placeholder-aspect-ratio: 202\/52;\"><\/figure>\n\n\n\n<p>Sabendo que a pot\u00eancia el\u00e9trica \u00e9 dada por<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"132\" height=\"164\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-321.png\" alt=\"\" class=\"wp-image-16237 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 132px; --smush-placeholder-aspect-ratio: 132\/164;\"><\/figure>\n\n\n\n<p>Em que i \u00e9 aproximadamente 30A<\/p>\n\n\n\n<p><strong>Alternativa B<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>O manual de uma ducha el\u00e9trica informa que seus tr\u00eas n\u00edveis de aquecimento (morno, quente e superquente) apresentam as seguintes varia\u00e7\u00f5es de temperatura da \u00e1gua em fun\u00e7\u00e3o de sua vaz\u00e3o: Utiliza-se um disjuntor para proteger o circuito dessa ducha contra sobrecargas el\u00e9tricas em qualquer n\u00edvel de aquecimento. Por padr\u00e3o, o disjuntor \u00e9 especificado pela corrente [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":16235,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,4],"tags":[],"area-do-conhecimento":[116,121],"assunto":[],"class_list":["post-16234","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-questoes-do-enem","category-4","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\/16234","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=16234"}],"version-history":[{"count":1,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16234\/revisions"}],"predecessor-version":[{"id":16245,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16234\/revisions\/16245"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media\/16235"}],"wp:attachment":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media?parent=16234"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/categories?post=16234"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/tags?post=16234"},{"taxonomy":"area-do-conhecimento","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/area-do-conhecimento?post=16234"},{"taxonomy":"assunto","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/assunto?post=16234"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}