Answer
$60 J$
Work Step by Step
Since the net change in internal energy is 0, all work done must come from heat input into the system. The area enclosed by the curve is $20 * 3 = 60J$, so this is the answer.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
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: 45
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