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Old Jan 12th 2010, 03:07 PM   #1
che
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Machine efficiency

Hey stuck on a problem and need some help,

A machine lifts a mass of weight (490.5N) through a height of 12m with 7.81KJ of energy exerted what is the efficiency of the machine.

Thanks

Che
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Old Jan 19th 2010, 10:28 AM   #2
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P=m.g.h
P=m.g* 10
P=490.5*10=5886 J ---- if efficiency was 100%

n=Theoretical E/Real E = 5880/7810= 75,3%
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