Asked/Added Questions From NCERT:

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

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


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