Answer
$\Delta U=576\ kJ$
Work Step by Step
Since
$\Delta U=mc\Delta T$
With $m=80\ kg,\ c=3.6\ kJ/kg.K,\ \Delta T=2\ K$:
$\Delta U=576\ kJ$
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 204: 4-93
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