Calculate the height through which a crane can lift a load of 4t,when it's motor of4hp operates for 10s.
[g=10ms-2]
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h = 2 t = 10s
mass = m = At = 4 x 1000 = 4000kg
force F = mg = 4000 x 10N
work done = F x h = 4000 x 10h
Power = 4HP = 4 x 750w
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