Answer
$W_b=40\ Btu$
Work Step by Step
For an isothermal system, the energy balance for the system reduces to:
$Q-W_b=0,\ \ \Delta U=mc_v\Delta T=0$
Since $Q=40\ Btu$
$W_b=40\ Btu$
Thermodynamics: An Engineering Approach 8th Edition
by Cengel, Yunus; Boles, Michael
Published by
McGraw-Hill Education
ISBN 10:
0-07339-817-9
ISBN 13:
978-0-07339-817-4
Chapter 4 - Energy Analysis of Closed Systems - Problems - Page 202: 4-74E
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