First slide

Power

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

Moderate

A

15 kW
B

9 kW
C

225 W
D

9000 HP

Solution

$P = Fv = 4500 \times 2 = 9000 W = 9 kW$

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