1.

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]

A.             15 kW
B.               9 kW             P = Fv \[=4500\times 2=9000\,W=9\,kW\]
C.             225 W
D.               9000 HP
Answer» E.


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