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  • Calculate the power of a crane in watts, which lifts a mass of 100 kg to a height of 10 m in 20s.

Calculate the power of a crane in watts, which lifts a mass of 100 kg to a height of 10 m in 20s.

Answers (1)

We know from the formula that, the power = work done/ time = \frac{Fds \cos \theta}{ time}

 F = mgh

mg = 100 \times 10 = 1000

h = 10 m

t = 20s

\theta =0, as the force and the displacement are in the same direction.

Hence, power = \frac{1000 \times 10 \cos 0}{20} = 500 watts

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infoexpert24

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