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Average and Instaneous Power

A pump is use...

Question

A pump is used to lift $500$ kg of water from a depth of $80$ m in $10$ s. Calculate the power at which the pump works.

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Solution

$P o w e r = w o r k / t i m e$

$W o r k = m g h = 500 \times 10 \times 80 = 400000 J$

$P o w e r = w o r k / t i m e = 400000 / 10 = 40000 W$

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