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ICSE Class 8 Physics Question 10 of 25

Energy — Question 11

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Question

Question 11

A pump raises water by spending 4 x 105 J of energy in 10 s. Find the power of pump.

Answer

Given:
Work done by pump = Energy spent = 4 x 105 J or 400000 J
time = 10 s
Power = ?

Power = Work donetime taken\dfrac{\text{Work done}}{\text{time taken}}

= 40000010\dfrac{\text{400000}}{\text{10}}

= 40000 W or 4 x 104 W

So power spent by the pump = 4 x 104 W.