Question

10.) If H.P.=746 and g=10m/s, then the
horse power of an engine which lifts
10,000 kg of load in 60 min. to a
height of 35 m is - *​

Answer 1

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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