Work Energy And Power Question 182

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 [MNR 1984]

Options:

A) 15 kW

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

C) 225 W

D) 9000 HP

Show Answer

Answer:

Correct Answer: D

Solution:

P $ =\frac{Workdone}{Time} $ = $ \frac{mgh}{t} $

$ =\frac{300\times 9.8\times 2}{3}=1960W $



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