Question

A man has a mass of 80kg. He ties himself to one end of a rope which passes over a single fixed pulley. He pulls on the other end of the rope to let himself up at an average speed of 50 cm/s. what is the average useful power at which he is working?
a) 40 W
b) 0.39 kW
c) 4.0 kW
d) 39 kW​

Answer 1

Explanation:

A) 40 w

power = force × velocity

therefore

• force = weight = 80
• velocity = 50÷100 m/s

now solve

(80×50)÷100= 40

Answer 2

Answer:

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Explanation:

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