Questions
A crane is used to lift 10,000 kg of coal from a mine 100 meter deep. Time taken by the crane is one hour. Assuming the efficiency of the crane to be 80%, the power of the crane in kW is
a
0.340
b
3.403
c
34.03
d
4.303
detailed solution
Correct option is B
Power =Wt=mght =(10000×9⋅8×100)J3600sec =98×10336J/s=9836kW η= Output Input or Input = Output η ∴ Input =9836×10080=3.403kWTalk to our academic expert!
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If force F is applied on a body and it moves with the velocity V, the power will be :
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