Question

A crane can lift 5000 kg mass to the height 10m in 10 sec. What is its power?

Answer 1

Answer:

49kw

Explanation:

Power = Work/Time

In this case the work is equal to the change in gravitational potential energy, mgh.

W = mgh = (5000 kg)(9.8m/s^2)(10m) = 490000 J

The time is 10 seconds, so

Power = W/T = 490000J / 10s = 49000 J/s = 49000 W = 49 kW

Answer 2

it's your ans-

given,

mass = 5000 kg

distance = height = 10 m

time = 10 sec

by formula,

force = mg ( g = 9.8 or 10 )

= 5000 * 10

= 50000 N

Work = force * displacement

= 50000 * 10

= 500000 J

Power = work / time

=  500000 / 10

=   50000 Watt

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