Answer
$\Delta U=52Btu$
Work Step by Step
Applying the energy balance:
$E_{in}-E_{out}=\Delta E_{system}$
$Q_{in}+W_{in}-Q_{out}-W_{out}=\Delta U$
$65Btu+0Btu-8Bt-5Btu=\Delta U$
Solving for $\Delta U$:
$\Delta U=52Btu$
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 2 - Energy, Energy Transfer, and General Energy Analysis - Problems - Page 100: 2-40E
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