## Conceptual Physics (12th Edition)

Published by Addison-Wesley

# Chapter 18 - Think and Solve: 39

#### Answer

a. Wally is using the Celsius temperature scale instead of kelvins. His reservoirs are actually at 273 + 300 = 573K, and 273 + 25 = 298 K. b. The maximum/ideal efficiency = $\frac{573 K – 298 K}{573 K} = 0.48 = 48\%$.

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