Electric Power Lift Work, Power, and Energy questions...?
1. A box that weighs 888 N is lifted a distance of 16.5 m straight up by a cable attached to a motor. The job is done in 10.0 s. What power is developed by the motor in watts and kilowatts?
2. An electric motor develops 89 kW of power as it lifts a loaded elevator 15.5 m in 42 s. How much force does the motor exert?
3. A 4500 kg helicopter accelerates upward at 2.0m/s(squared). What lift force is exerted by the air on the propellers?
Can anyone help me with any one of these questions?
Power = Work /time = force x distance /time
=888*16.5 /10= 1465.2 W.
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Power = force x distance/time
Force = Power *time /distance = 89000*42 /15.5
241 .1613 k N.
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To have an acceleration of 2 m/s^2, the net acceleration must be 9.8 +2 = 11.8 m/s^2.
The lift force = mass x net acceleration
F = 4500 x11.8 = 53100 N.
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