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the motor for a lift in a tall building uses 12000 watts of power .the lift and its passengers has a mass of 500kg the lift motor takes 10 seconds to rise the lift and its passengers through a height of 20 metres work out the efficiecy of the lift motor

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the motor for a lift in a tall building uses 12000 watts of power .the lift and its passengers has a mass of 500kg the lift motor takes 10 seconds to rise the lift and its passengers through a height of 20 metres work out the efficiecy of the lift motor
del
13 January 2011
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