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Power, Force and Velocity

An electric m...

Question

An electric motor creates a tension of 4500 N in a hoisting cable and reels it in at the rate of 2 m/s. What is the power of the electric motor?

A

900 W

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B

225 W

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C

9 kW

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D

15 kW

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Solution

The correct option is C
9 kW

Power = Force x velocity

P = 4500 x 2 = 9000 W = 9 kW

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