Question

The input power to an electric motor is 200kw.
its efficiency is 80%. it operates a crane of efficiency
90%
if the crane u lifting a dead d 3.6tonns
the velocity with which the load moves is​

Answer 1

Answer:

ANSWER

Power with which crane lifts the load =0.8×0.9 × input power

P=0.8×0.9×200 kW

Now, P=

F

.

v

Here, F=mg (since there is no acceleration)

10

3

×0.8×0.9×200=3.6×10

3

×10×v

⇒v=4 m/s