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Reported Question / Answer
Q.) An elevator motor is used to lift 1000 N load to a height of 0.25 km. If the total amount of energy input is 1MJ, which one of the following pairs of values of energy wasted and efficiency are correct?
1)
Energy wasted = 500 kJ, Efficiency = 75 %
2)
Energy wasted = 750 kJ, Efficiency = 75 %
3)
Energy wasted = 750 kJ, Efficiency = 25 %
4)
Energy wasted = 500 kJ, Efficiency = 25 %
5)
NULL
Answer :
3
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