Answer
$W=216000lbf*ft=277.57Btu$
Work Step by Step
Knowing that: $1ton=2000lbm$
Then: $W=mgh=(3*2000lbm)*(32.2\frac{ft}{s^2})*(36ft)*(\frac{1lbf}{32.2\frac{lbm*ft}{s^2}}=216000lbf*ft$
$216000lbf*ft*(\frac{1Btu}{778.17lbf*ft})=277.57Btu$
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 98: 2-27E
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