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