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11 July, 00:46

A fire engine must lift 30 kg of water a vertical distance of 20 m each second. What is the amount of power needed for the water pump for this fire hose?

P=W/t=Fd/t=mgd/t (30) (9.8) (20) / 1 = 5880 W is that right?

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  1. 11 July, 03:13
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    Power is the rate of doing work. It is the amount of energy consumed per unit time. Having no direction, it is a scalar quantity. We express it as follows:

    P = W / t

    where W = Fd

    F = mg

    Therefore,

    P = mgd / t

    P = (30) (9.81) (20) / 1 = 5886 W
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