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Question: An electric motor creates a tension of 4500 newton in a hoisting cable and reels it in at the rate o...

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

B

9 kW

C

225 W

D

9000 HP

Answer

9 kW

Explanation

Solution

P = Fv =4500×2=9000 W=9 kW= 4500 \times 2 = 9000 \mathrm {~W} = 9 \mathrm {~kW}