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Question 1. Asked on :12 January 2019:09:19:43 AM

#### How much time will a pump of 1 KW power take to lift 500 litre of water to a height of 40 m ? Given that density of water is 1 kg litre and g= 10 m s-2.

-Added by Akki chauhan Science » Work

Himanshi Verma

The potential energy to raise the water

=  mass of water (500kg, 1 liter of water is 1 kg) x gravitational pull(10m/s) x height (40m)

500kg x 10m/s x 40m= 200000 joules (work, potential energy)

.Power = work / time

Therefore time = work 200000joules/power 1kw= 1000joules/s)

time =  200000joules/1000joulse/s

= 200000/1000 s

= 200 s

-Answered by Himanshi Verma On 16 January 2019:05:59:15 PM

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