Q.

If the maximum load carried by an elevator is 1400 kg (600 kg – passenger + 800 kg – elevator), which is moving up with a uniform speed of 3 ms-1 and the frictional force acting on it is 2000 N, then the maximum power used by the motor is _______ kW (g=10 m/s2)           [2023]


Ans.

(48)

Pmax=Fmax×v

Fmax=1400 g+friction

          =14000+2000=16000

Pmax=16000×3=48000 W=48 kW