Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 20 - Entropy and the Second Law of Thermodynamics - Problems - Page 605: 23

Answer

$96.7$ $K$

Work Step by Step

The formula for efficiency is $1-\frac{T_c}{T_h}$. Since efficiency is 0.4 and temperature of cold reservoir is 290 K, the temperature of the hot reservoir is $483.3 K$. To get an efficiency of 0.5, we need the temperature of the hot reservoir to be $580 K$, so an increase of $96.7 K$
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