Recall Problem 1.34, which concerned an ideal diatomic gas taken around a rectangular cycle on a PV diagram. Suppose now that this system is used as a heat engine, to convert the heat added into mechanical work.  (a)     Evaluate the efficiency of this engine for the case V2 = 3V1 , P2 = 2P1.  (b)     Calculate the efficiency of an "ideal" engine operating between the same  temperature extremes.

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