Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 18 - Temperature, Heat, and the First Law of Thermodynamics - Problems - Page 543: 47a

Answer

$6$ cal

Work Step by Step

Since paths iaf and ibf begin and end at the same points, $\Delta U$ must be the same, so $Q- W$ must be the same. In process iaf, $Q-W = 50-20 = 30$ cal, so in process ibf, $36 - W = 30$, so $W = 6$.
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