Question

Crane operated by an electric motor
has a mass of 500 kg. It raises a load of
300 kg vertically at a steady speed of
0.2 ms 1. The frictional force is
constant and equal to 1200 N.
Calculate what is the power required.
(Take g = 10 ms 2)

Answer 1

power= total force×velocoty
= (wieght + friction)×velocity
= (1200+300×10)×0.2
= 4200×0.2
= 820