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Q.

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

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a

15 kW

b

9 kW

c

225 kW

d

9000 kW

answer is B.

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Detailed Solution

Pinst=F→.V→=FV cosθ
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