please solve q no 2.
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Given that,
Efficiency of engine = 80% = 0.8
1 HP = 746 Watt
Power of engine which is used = 746*0.8 = 596.8 W
Energy required to lift the water, E = mgh
= 20000*10*20 = 4000000 J
Time taken by pump = E/W = 4000000/596.8 = 6702.41 s = 1.862 hours
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