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ฟิสิกส์โอลิมปิก วิทยาศาสตร์โอลิมปิก ข้อสอบแข่งขัน ข้อสอบชิงทุน => GRE - Physics => Topic started by: conantee on January 10, 2010, 06:15:18 AM



Title: GR9277.016
Post by: conantee on January 10, 2010, 06:15:18 AM
16. An engine absorbs heat at a temperature of 727 \mbox{ ^oC} and exhausts heat at a temperature of 527 \mbox{ ^oC}. If the engine operates at maximum possible efficiency, for 2000 joules of heat input the amount of work the engine performs is most nearly
(A) 400 \mbox{ J}
(B)  1450 \mbox{ J}
(C)  1600 \mbox{ J}
(D)  2000 \mbox{ J}
(E)  2760 \mbox{ J}