Q.5 How much time will a pump of 1 kW power takes to lift 500 kg of water to height of 40 m?
(g= 10m/s)
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Explanation:
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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