Fundamentals of Engineering Thermodynamics 8th Edition

Published by Wiley
ISBN 10: 1118412931
ISBN 13: 978-1-11841-293-0

Chapter 2 - Problems: Developing Engineering Skills - Page 81: 2.2

Answer

Initial Potential Energy = $582kJ$ Change in Potential Energy = $-291kJ$

Work Step by Step

(a) Intial Potential Energy = $mgh$ Mass is the product of density and volume Potential Energy = $(\rho V)gh = 1000*2*9.7*30 = 582000 J = 582 kJ$ (b) Change in Potential Energy = $mg(z_2-z_1) = (\rho V)(z_2-z_1)=1000*2*9.7*(-15)=-291000J = -291kJ$
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