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10 September, 09:15

A water pump pumps 3 kg of water every second from the bottom of a well to the top of the well 50 m above. If the pump uses 2000 W of electrical power to accomplish the task, what is the efficiency of the pump

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  1. 10 September, 09:40
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    70%

    Explanation:

    Power = work / time

    P = mgh / t

    P = (3 kg) (9.8 m/s²) (50 m) / (1 s)

    P = 1470 W

    Efficiency = power out / power in

    e = 1470 W / 2000 W

    e = 0.735

    The efficiency of the pump is 0.735, or 73.5%.

    Rounded to one significant figures, the efficiency is 0.7, or 70%.
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