Answer
$40$ cal
Work Step by Step
By the First Law of Thermodynamics, $\Delta U = Q-W$. Considering path iaf, we see that $\Delta U = 30$, so $E_{int,f} = 40$ cal.
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: 47c
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