Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 18 - The Laws of Thermodynamics - Problems and Conceptual Exercises - Page 648: 91

Answer

(a) $-38J$ (b) $0$ (c) $-171J$ (d) $212J$ (e) $120J$

Work Step by Step

(a) According to the first law of thermodynamics $Q=\Delta U+W$ We plug in the known values to obtain: $Q=-38J+0$ $\implies Q=-38J$ (b) We know that $W=P\Delta V$ as $\Delta V=0$ $\implies W=P(0)$ $W=0$ (c) We know that $Q=\Delta U+W$ $\implies Q=-82J-89J$ $\implies Q=-171J$ (d) We know that $W=Q-\Delta U$ $\implies W=332J-120J$ $\implies W=212J$ (e) We know that $\Delta U_{C\rightarrow A}=-(\Delta U_{A\rightarrow B}+\Delta U_{B\rightarrow C})$ $\implies \Delta U_{C\rightarrow A}=-[(-38J)+(-82J)]=120J$
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