Answer to Question #78680 in Physics for Simon Swedi

Question #78680

A man uses a pulley system to raise a 150lb load to a height of 10ft. if he exerts a force on the rope
50lb through 35ft to accomplish the work;
a. How much work does he do?
b. What is the efficiency of the machine?

Expert's answer

W=Fg=(150)(10)=1500 ft lb.
η=1500/(50(35))=0.857 or 85.7%.

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