Question

A man uses a pulley system to raise a load of 100 kg to a height of 10 m. He exerts a force of 60 kg newton on the rope over a distance of 25m. What is the efficiency of the system? (g=10 Nkg-1)

Answer 1

Answer:

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Explanation:

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Answer 2

Explanation:

Given A man uses a pulley system to raise a load of 100 kg to a height of 10 m. He exerts a force of 60 kg newton on the rope over a distance of 25 m. What is the efficiency of the system?  

• Now a pulley system is used to raise a load of 100 kg to a height of 10 m.
• So work is done by the man
• So we have W = F x S
•                          = 60 x 25
•                        = 1500 kg-m
• Now W out = F out x d out
•                     = 100 x 10
•                     = 1000 kg-m
• So Efficiency = W out /W in
•                     = 1000 / 1500
•                   = 0.66
•                 = 66%

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