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 $
