A crane lifts pallets of bricks, each of which weigh 5000N. the crane lifts each pallet a height of 30m. The crane takes 4 minutes to do this. How much useful power did the crane produces to lift the bricks?
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Answer:
Given : m=600kg h=20 m
Time of operation t=2 min =120 s
Work done in lifting a box W=mgh=600×10×20=120000
Power required P=
t
W
=
120
120000
=1000 watts
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