Essential University Physics: Volume 1 (4th Edition) Clone

Published by Pearson
ISBN 10: 0-134-98855-8
ISBN 13: 978-0-13498-855-9

Chapter 19 - Exercises and Problems - Page 362: 40

Answer

The answer is below.

Work Step by Step

We consider all of the energy flows in this situation. When the refrigerator is added to the cooling reservoir of the engine, the maximum that the energy saved can increase is the amount of energy that it takes to cool the reservoir. All of the other energy flows are the same. Thus, the refrigerator would have to be 100% efficient just to have no worse efficiency.
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