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Q.

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

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a

9000 HP

b

15 kW

c

9 kW

d

225 W

answer is B.

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Detailed Solution

P=Fv=4500×2=9000W=9kW

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