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/s, What is the power of this motor?

Moderate

A

25 kW
B

9 kw
C

225 watt
D

9000 hP

Solution

Power $= F \cdot v = 4500 \times 2 W = 9000 W = 9 kW$ .

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