Conceptual Physics (12th Edition)

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

Chapter 7 - Reading Check Questions (Comprehension) - Page 126-127: 6

Answer

a. Same power. b. Twice the power to lift the lighter sack.

Work Step by Step

a. Power is work done divided by the time interval (page 112). The amounts of work done are the same, and the times are the same. The powers will be the same. b. If the same work is done in only half the time, the power required is doubled.
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