637_Physics ProblemsTechnical Physics

637_Physics ProblemsTechnical Physics - Chapter 22 *P22.19...

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Chapter 22 639 *P22.19 (a) e WW Q eQ Q h hh h = + = + eng1 eng2 1 11 22 1 Now QQQW Qe Q hch h h 211 1 1 ==− =− eng . So e e Q Q eee e h h = +− =+ 2 1 1 121 2 bg . (b) ee e e e T T T T T T T T T T T T T T T T T T T T i h c i i h c i i h c i i h c i c h c h =+− =− +− −− F H G I K J F H G I K J =− − −+ + − = − 2 2 1 1 The combination of reversible engines is itself a reversible engine so it has the Carnot efficiency. (c) With eng2 eng1 = , e Q W Q e = + == eng1 eng2 eng1 1 2 2 12 1 01 2 2 1 2 −= F H G I K J T T T T T T T T TTT TT T c h i h c h i h ihc ih c (d) ee T T T T T T i h c i ic h c 2 ==− =− = = P22.20 The work output is Wm eng train . m s = 1 2 500 2 . We are told e W Q h = eng 0200 1 2 2 . m s = m Q t h and e
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