Answer
The heat flow out of the system was $~100~J$
Work Step by Step
We can find the heat flow:
$\Delta U = Q + W$
$Q = \Delta U - W$
$Q = 400~J - 500~J$
$Q = -100~J$
The heat flow out of the system was $~100~J$.
College Physics (4th Edition)
by Giambattista, Alan; Richardson, Betty; Richardson, Robert
Published by
McGraw-Hill Education
ISBN 10:
0073512141
ISBN 13:
978-0-07351-214-3
Chapter 15 - Problems - Page 567: 3
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