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Um ciclo Diesel ideal operando com \"ar padrão frio\" é comprimido de 3 \text{L} para 0,15 \text{L} e, em seguida, é expandido o processo de fornecimento de calor a uma pressão constante para 0,45 \text{L}. Dessa maneira, a eficiência desse ciclo é:

","status","pending_classification","hasRelatedVideo","relatedVideos",[88],{"_89":90,"_108":109,"_30":124,"_143":144,"_162":125},"content",{"_22":91,"_36":92,"_93":-5,"_94":95,"_96":97,"_98":-5,"_24":99,"_102":103,"_104":103,"_105":-5,"_106":107},"162087be-594f-460e-bbdd-a339ac2f10ad","Calor Latente - Parte 1","description","content_type_id","1051eee7-c62e-4b2c-9900-77a29fcec080","resource_id","f2b62fc2-7079-40e7-a5b5-c4a9769b205d","user_id",{"_100":101},"external_id","3659","created_at","2025-08-20T12:27:41.608438+00:00","updated_at","content_group_id","slug","calor-latente-parte-1","prometheusData",{"_110":111,"_117":118,"_119":120,"_121":122,"_6":123},"provider",{"_22":112,"_113":114,"_115":116},"06f120be-2194-4548-8336-7ba44ffbae14","key","grupo_q_proteus","kind","proteus","reference","bf8aacba-3de9-4b10-961c-47ada80dfe8c","state","completed","thumbnail_url","https://proteus.grupoq.io/videos/bf8aacba-3de9-4b10-961c-47ada80dfe8c/thumbnailsthumb.0000000.jpg","https://proteus.grupoq.io/videos/bf8aacba-3de9-4b10-961c-47ada80dfe8c/levels.m3u8",[125],{"_22":126,"_36":127,"_38":128,"_129":130,"_131":132,"_102":133,"_104":133,"_24":134,"_106":128,"_141":142},"96193fa0-9495-45b2-81cc-b547604354af","Física Térmica - Termologia","fisica-termica-termologia","tag_group_id","c1ce2cf2-b217-4cc7-8182-81c56bd3522d","parent_id","c8ab2a95-fd84-4d6f-ade0-835d34ba00f9","2025-04-29T03:44:27.560682+00:00",{"_135":136,"_137":138,"_139":140},"childrenCount",10,"content_count",0,"question_count",8575,"children",[],"video",{"_22":97,"_145":92,"_93":-5,"_146":147,"_148":149,"_6":-5,"_150":-5,"_110":149,"_151":152,"_121":-5,"_153":-5,"_154":-5,"_155":-5,"_156":-5,"_24":157,"_158":138,"_159":-5,"_83":160,"_102":161,"_104":161},"title","duration",17,"source_type","prometheus","iframe_url","provider_video_id","748a4adb-ad8f-4c5f-88a9-bc522d3b4246","format","quality","file_path","file_size",{"_100":101},"views_count","last_played_at","draft","2025-08-19T11:56:22.11908+00:00","tag","similarQuestions",[165,195,213],{"_18":166,"_20":21,"_22":167,"_57":168,"_80":183,"_81":184,"_30":185},"112831da-be9c-458e-94cb-e8292d0dba12","3c0b9441-b878-4896-8bac-fa4ca61e3f13",[169,172,175,178,181],{"_22":170,"_61":62,"_63":171},"265bd71a-6749-41f5-b291-67efd646ca64","y'' + 2y' - 3y = 0",{"_22":173,"_61":66,"_63":174},"6d3c3a1d-8e80-4ff3-b97a-d5b5bca91940","6y'' - y' - y = 0",{"_22":176,"_61":70,"_63":177},"4168ac67-64fd-46ed-a69c-a01dbfcde7ea","y'' - 2y' + y = 0",{"_22":179,"_61":74,"_63":180},"cc7bc8df-6995-4264-ac5a-32ea9b4ed7db","9y'' + 6y' + y = 0",{"_22":166,"_61":78,"_63":182},"y'' - 2y' + 6y = 0","Somente em y''−2y'+6y=0 o polinômio característico r²−2r+6=0 tem Δ<0, gerando raízes complexas conjugadas (1±i√5) e, portanto, solução em termos de exponencial modulando seno e cosseno. Nos demais itens (a–d) o discriminante é ≥0, produzindo raízes reais (distintas ou repetidas).","

Resolva as seguintes EDOs determinando a solução geral e, quando houver condições iniciais do PVI, a solução particular.

(a) y'' + 2y' - 3y = 0

(b) 6y'' - y' - y = 0

(d) 9y'' + 6y' + y = 0

(e) y'' - 2y' + 6y = 0

(f) 4y'' + 9y = 0

(g) 6y'' - 5y' + y = 0; \\, y(0) = 4; \\, y'(0) = 0

(h) y'' + 4y' + 4y = 0; \\, y(-1) = 2; \\, y'(-1) = 1

(i) y'' + y = 0; \\, y\bigg(\\frac{\\pi}{3}\\bigg) = 2; \\, y'\\bigg(\\frac{\\pi}{3}\\bigg) = -4

(j) y'' - 2y' - 3y = 3e^{2t}

(k) y'' + 9y = t^2 e^{3t} + 6

(l) 2y'' + 3y' + y = t^2 + 3 \\sin(t)

(m) y'' + y' - 2y = 2t; \\, y(0) = 0; \\, y'(0) = 1

(n) y'' - 2y' + y = te^t + 4; \\, y(0) = 1; \\, y'(0) = 1

(o) y'' + 4y = 3 \\sin(2t); \\, y(0) = 2; \\, y'(0) = -1

",[186],{"_22":187,"_36":188,"_38":189,"_129":130,"_131":190,"_102":191,"_104":191,"_24":192,"_106":189},"6516bbbd-f2a3-4710-8382-702240b17836","Mecânica na Engenharia de Petróleo","mecanica-na-engenharia-de-petroleo","b787e438-0ab3-454c-ab43-5d3d14c2720d","2025-04-29T03:44:35.328997+00:00",{"_135":193,"_137":138,"_139":194},4,12302,{"_18":196,"_20":21,"_22":197,"_57":198,"_80":210,"_81":211,"_30":212},"6831a9b9-c9a4-4a76-bd7a-2ce98bfea875","93a32dd4-5fc6-4ccb-a76f-4724bf113742",[199,202,205,207],{"_22":200,"_61":62,"_63":201},"13e3f476-a0a5-421f-b47e-0969e8e9a7e0","

Verdadeiro, verdadeiro, falso

",{"_22":203,"_61":66,"_63":204},"c9a20855-d84b-4860-8b35-9784818282cf","

Falso, verdadeiro, verdadeiro

",{"_22":196,"_61":70,"_63":206},"

Verdadeiro, falso, verdadeiro

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Falso, falso, falso

","85,5 % decomposto → 14,5 % restante.\nN/N0 = 0,145 ⇒ t = ln(1/0,145)/(ln2/5730) ≈ 1,6×10⁴ anos.\nItens prováveis: (1) resta 14,5 % do C-14 (V); (2) idade ≈ 1,2×10⁴ anos ou 3 meias-vidas (F); (3) t½ do C-14 = 5730 anos (V). Sequência: V-F-V, correspondendo à alternativa c.","

Qual é a idade da madeira na qual 85,5\\% do C-14 se decompos?

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a) ????3 de ????4????5
b) ????2 de ????2????????2
c) ????1 de 2????????1
d) ????1 de 2????2????",[186],[186,235,242,252,259,266,267,275,281,286,292,299],{"_22":236,"_36":37,"_38":39,"_129":130,"_131":237,"_102":133,"_104":133,"_24":238,"_106":241},"6b6faf95-0e3a-4f58-abc8-e1444c48041d","92339f4f-ed20-4f4c-ad85-0c3de7e04ae0",{"_135":239,"_137":138,"_139":240},2,11846,"termodinamica-3",{"_22":243,"_36":244,"_38":245,"_129":130,"_131":246,"_102":247,"_104":247,"_24":248,"_106":251},"861ad829-750d-4a44-9569-2f18b430b4df","Engenharia Mecatrônica","engenharia-mecatronica","eb9315c5-bd04-4116-aa46-02c4fde320c0","2025-04-29T02:19:12.828432+00:00",{"_135":249,"_137":138,"_139":250},5,30614,"engenharia-mecatronica-1",{"_22":253,"_36":254,"_38":255,"_129":130,"_131":243,"_102":191,"_104":191,"_24":256,"_106":258},"88fe96b3-2a17-4198-90d5-ddda3d6f5d45","Mecânica","mecanica",{"_135":249,"_137":138,"_139":257},25741,"mecanica-3",{"_22":237,"_36":260,"_38":261,"_129":130,"_131":246,"_102":247,"_104":247,"_24":262,"_106":265},"Engenharia Mecânica","engenharia-mecanica",{"_135":263,"_137":138,"_139":264},11,36318,"engenharia-mecanica-2",{"_22":126,"_36":127,"_38":128,"_129":130,"_131":132,"_102":133,"_104":133,"_24":134,"_106":128},{"_22":268,"_36":269,"_38":270,"_129":130,"_131":-5,"_102":271,"_104":271,"_24":272,"_106":270},"9772e958-72c6-4499-ad47-877cf94d670d","Exatas","exatas","2025-04-29T01:56:45.284172+00:00",{"_135":273,"_137":138,"_139":274},18,135489,{"_22":276,"_36":37,"_38":39,"_129":130,"_131":187,"_102":277,"_104":277,"_24":278,"_106":280},"b21374de-aae5-4a4a-9bf3-0420e731797e","2025-04-29T04:00:14.680867+00:00",{"_135":138,"_137":138,"_139":279},8597,"termodinamica-5",{"_22":190,"_36":282,"_38":283,"_129":130,"_131":246,"_102":247,"_104":247,"_24":284,"_106":285},"Engenharia de Petróleo","engenharia-de-petroleo",{"_135":249,"_137":138,"_139":194},"engenharia-de-petroleo-1",{"_22":132,"_36":287,"_38":288,"_129":130,"_131":268,"_102":247,"_104":247,"_24":289,"_106":291},"Física","fisica",{"_135":263,"_137":138,"_139":290},13777,"fisica-4",{"_22":246,"_36":293,"_38":294,"_129":130,"_131":-5,"_102":295,"_104":295,"_24":296,"_106":294},"Engenharia","engenharia","2025-04-29T01:55:38.635246+00:00",{"_135":297,"_137":138,"_139":298},29,351586,{"_22":300,"_36":37,"_38":39,"_129":130,"_131":253,"_102":301,"_104":301,"_24":302,"_106":303},"f5967cbe-d751-4b40-81f2-04eb5dead2a9","2025-04-29T04:00:13.215003+00:00",{"_135":138,"_137":138,"_139":279},"termodinamica-4","tagsTree",[306,310],{"_22":268,"_36":269,"_38":270,"_129":130,"_131":-5,"_102":271,"_104":271,"_24":272,"_106":270,"_141":307},[308],{"_22":132,"_36":287,"_38":288,"_129":130,"_131":268,"_102":247,"_104":247,"_24":289,"_106":291,"_141":309},[125],{"_22":246,"_36":293,"_38":294,"_129":130,"_131":-5,"_102":295,"_104":295,"_24":296,"_106":294,"_141":311},[312,318,322],{"_22":243,"_36":244,"_38":245,"_129":130,"_131":246,"_102":247,"_104":247,"_24":248,"_106":251,"_141":313},[314],{"_22":253,"_36":254,"_38":255,"_129":130,"_131":243,"_102":191,"_104":191,"_24":256,"_106":258,"_141":315},[316],{"_22":300,"_36":37,"_38":39,"_129":130,"_131":253,"_102":301,"_104":301,"_24":302,"_106":303,"_141":317},[],{"_22":237,"_36":260,"_38":261,"_129":130,"_131":246,"_102":247,"_104":247,"_24":262,"_106":265,"_141":319},[320],{"_22":236,"_36":37,"_38":39,"_129":130,"_131":237,"_102":133,"_104":133,"_24":238,"_106":241,"_141":321},[],{"_22":190,"_36":282,"_38":283,"_129":130,"_131":246,"_102":247,"_104":247,"_24":284,"_106":285,"_141":323},[324],{"_22":187,"_36":188,"_38":189,"_129":130,"_131":190,"_102":191,"_104":191,"_24":192,"_106":189,"_141":325},[326],{"_22":276,"_36":37,"_38":39,"_129":130,"_131":187,"_102":277,"_104":277,"_24":278,"_106":280,"_141":327},[],"videoDislikes",{},"videoLikes",{},"actionData","errors"]

Comentários