635_Physics ProblemsTechnical Physics

635_Physics ProblemsTechnical Physics - Chapter 22 P22.11...

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Chapter 22 637 P22.11 T c = 703 K T h = 2143 K (a) e T T c h = == 1440 2143 67 2% . (b) Q h 140 10 5 . J , WQ h eng = 0420 . P × = W t eng J s kW 588 10 1 58 8 4 . . P22.12 The Carnot efficiency of the engine is e T T c h = 120 0253 K 473 K . At 20.0% of this maximum efficiency, e 0 200 0 253 0 050 6 .. . af From the definition of efficiency e h eng = and Q W e h = eng kJ . kJ 10 0 00506 197 . P22.13 Isothermal expansion at T h = 523 K Isothermal compression at T c = 323 K Gas absorbs 1 200 J during expansion. (a) QQ T T ch c h = F H G I K J = F H G I K J = 1200 741 J 323 523 J (b) Q hc eng J J =−= = 1 200 741 459 bg P22.14 We use e T T c c h =− 1 as 0300 1 573 . K T h From which, T h ° 819 546 KC *P22.15 The efficiency is e T T Q
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