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A lift is designed to carry a load of 40...

A lift is designed to carry a load of 4000 kg through 10 floors of a building, avarage 6m per floor, in 10s. Calculate the power of the lift.

Text Solution

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Total distance covered by the lift, `s= 10xx6 m = 60m`
time in which this disntane, `t =10s`
force exrted by the lift, `F = 4000 kg wt = 4000xx10N (1kg wt =10N)`
velocity of the lift `upsilon = (s)/(t) = (60m)/(10s) = 6m//s`
Power of the lift, `P = F upsilon =(4xx10^4N)(6m//s) = 24xx10^4W =240kW`
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