An engine pumps up 200kg of water through a height of 20m in 20 sec. The efficiency of the engine is 50% , what is the power of the engine ? (g=10m/ second square)
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Output power = mgh
t
= 5s
500kg×10 s²m/×10m
=10×10³Watt
=10kW
Effeciency=[ (Inputpower) (Outputpower ]×100
75=[ (Inputpower)10kW ]×100
Inputpower=1.33kW
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