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Power, Force and Velocity

An electric m...

Question

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

A

15 kW

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B

9 kW

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C

225 W

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D

9000 HP

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Solution

The correct option is B
9 kW

$P = F v = 4500 \times 2 = 9000 W = 9 k W$

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