Answer
25 MJ
Work Step by Step
The energy used is 10 MJ. However, the process of harvesting that energy at the power plant is only 40% efficient. Thus, we find:
$ E= \frac {10 MJ}{.4}=25 MJ$
Essential University Physics: Volume 1 (3rd Edition)
by Wolfson, Richard
Published by
Pearson
ISBN 10:
0321993721
ISBN 13:
978-0-32199-372-4
Chapter 19 - Exercises and Problems - Page 352: 72
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