Essential University Physics: Volume 1 (3rd Edition)

Published by Pearson
ISBN 10: 0321993721
ISBN 13: 978-0-32199-372-4

Chapter 19 - Exercises and Problems: 18

Answer

Please see the work below.

Work Step by Step

We know that the heat absorbed from the water is $Q_c=mL_f$ We plug in the known values to obtain: $Q_c=(0.670)(334000)$ $Q_c=223780J$ For a refrigerator $COP=\frac{Q_c}{W}$ This can be rearranged as: $W=\frac{Q_c}{COP}$ We plug in the known values to obtain: $W=\frac{223780}{4.2}$ $W=53000J$
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