Fall 2006 7 Sm

An ideal heat engine is powered by two reservoirs of equal heat capacity C, which is temperature independent. As the engine works, the reservoirs gradually equilibrate. Find the overall efficiency of the engine from the starting point where the reservoirs are at temperatures T1 and T2 (T2 < T1) to the moment of complete equilibration. Efficiency is defined as the work done divided by the heat supplied by the hotter reservoir.

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Answer

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