Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 7 - Plug and Chug: 40

Answer

Efficiency = $$\frac{energy \;output}{energy \;input} = \frac{40 J}{100 J} = 0.40 = 40\%$$
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