A water pump with a power of 40KW has a mechanical efficiency of 65%. If water from the river is pum

Total power=Pt=40kW*1h=40*10^3W*(3600s)=1.44*10^8J

Power used=0.65*(1.44*10^ 8)=9.36*10 ^7J

Useful work=mgh

m=Useful work/(gh)=(9.36*10^7)/(10* 10)=9.36*10^5kg=936t

The mass of water pumped per hour is 9.36*10^5kg, or 936 tonnes

The power of A water pump is 10 kW and its mechanical efficiency is 80%. So how many cubic meters of water can be pumped to a height of 1 m in one hour

P×T＝F×S

Power×time=force×distance

F=1500*48/8=9000 (Newton)

F is the gravity of the water, that is to say the G of the water,

From G=mg, we can obtain m=G/g=9000/9.8=918 (kilogram)

For 1L of water=1Kg=10N

1 Work done by lifting water = 10N ×80%×1h=10kw×80%×60×60s=2880000w =2880000 Nm

So 2880000÷10000=288 cubic meters of water can be pumped up to a height of 1 m.

This answer is my personal opinion and is for plain referencequely. Make your own judgment as to whether it is good or bad.