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Potential Energy Formulae

Q2)Use the fo...

Question

Q2)
Use the following information to answer the next question.
A woman pulls a bucket filled with water from a well in 12 seconds. The combined mass of the bucket and the water is 7 kg. The depth of the well is 21 metres.
What is the power used by the woman to pull the bucket?
116.04 W
120.05 W
122.08 W
115.03 W

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Solution

Dear Student,

m = M_b+M_w=7
Time taken to pull = 12 s
S = 21m
P = mg(dh/dt)
= 79.8(21/12)
= 120.05W

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