Question: Write the ratios for the efficiency of a heat engine, the coefficients of performance of cooling for a refrigerator, and the coefficients of performance of

Write the ratios for the efficiency of a heat engine, the coefficients of performance of cooling for a refrigerator, and the coefficients of performance of heating a room using a heat pump in terms of $W, Q_{\text {in }}$, and $Q_{\text {our }}$. Make a generalization about the quantity on the top of each ratio and the quantity on the bottom of each ratio.

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