## Conceptual Physics (12th Edition)

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 = $\frac{573 K – 298 K}{573 K} = 0.48 = 48\%$.