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[Post New]7 Jun 2007 02:13:40 IST
    Subject: I am not getting the answer
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rakesh61 (1898)

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An engine pumps up 100 kg of water through a height of 10 m in 5 sec
efficiency of engine being 60 % what is power of engine
 
Ans 3.3 KW
 
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[Post New]7 Jun 2007 06:57:41 IST
    Subject: Re:I am not getting the answer
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iitkgp_bipin (6144)

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Work done in raising 100 kg water through a height of 10 m = mgh

Work = (100)(9.8)(10) = 9800 J

This work is done in 5 seconds.

Power needed = Work/Time = 9800/5 = 1960

Let the power of engine is P.
Since the efficiency is 60%.
Useful power = 60% of P = 0.6P

Hence 0.6P = 1960

P = 1960/0.6 = 3266.67 W

Bipin Kumar Dubey
Chemical Dept.
IIT Kharagpur

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