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 643: 1

Answer

(a) zero (b) zero (c) $-100J$

Work Step by Step

(a) We know that $\Delta U=Q-W$ We plug in the known values to obtain: $\Delta U=50J-50J=0J$ (b) As $\Delta U=Q-W$ We plug in the known values to obtain: $\Delta U=-50J-(-50J)=0J$ (c) $\Delta U=Q-W$ We plug in the known values to obtain: $\Delta U=-50J-50J=-100J$
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