A man uses a rope and a system of pulleys to raise a 200-lb box to a height of 10 ft. He exerts a force of 60 lb on the rope and pulls a total of 40 ft of rope through the pulleys. (a) How much work does he perform? (b) By how much is the potential energy of the box increased? (e) If these answers are different, what do you think the reason is?
A man uses a rope and a system of pulleys to raise a 200-lb box to a height of 10 ft. He exerts a force of 60 lb on the rope and pulls a total of 40 ft of rope through the pulleys. (a) How much work does he perform? (b) By how much is the potential energy of the box increased? (e) If these answers are different, what do you think the reason is?
An Introduction to Physical Science
14th Edition
ISBN:9781305079137
Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
Publisher:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar Torres
Chapter4: Work And Energy
Section4.4: Power
Problem 4.3CE: A student expends 7.5 W of power in lifting a textbook 0.50 m in 1.0 s with a constant velocity. (a)...
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A man uses a rope and a system of pulleys to raise a 200-lb box to a height of 10 ft. He exerts a force of 60 lb on the rope and pulls a total of 40 ft of rope through the pulleys. (a) How much work does he perform? (b) By how much is the potential energy of the box increased? (e) If these answers are different, what do you think the reason is?
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