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Jan 12th 2010, 03:07 PM
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1
che
Junior Member
Join Date: Jan 2010
Posts: 5
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
Jan 19th 2010, 10:28 AM
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2
Corum
Junior Member
Join Date: Jan 2010
Posts: 11
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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