632_Physics ProblemsTechnical Physics

632_Physics ProblemsTechnical Physics - 634 Heat Engines...

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634 Heat Engines, Entropy, and the Second Law of Thermodynamics SOLUTIONS TO PROBLEMS Section 22.1 Heat Engines and the Second Law of Thermodynamics P22.1 (a) e W Q h === eng J 360 J 25 0 00694 . . or 694% . (b) QQW ch =− = = eng J J J 360 25 0 335 . P22.2 WQ Q hc eng J =−= 200 (1) e W Q Q Q h c h == = eng 10 3 0 0 . (2) From (2), QQ = 0700 . (3) Solving (3) and (1) simultaneously, we have (a) Q h = 667 J and (b) Q c = 467 J . P22.3 (a) We have e W Q Q Q Q h h c h = eng 2 5 0 . with Q c = 8 000 J, we have Q h = 10 7 . k J (b) Q eng J 2667 and from P = W t eng , we have t W = eng J 5000 J s s 0533 .. *P22.4
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