- #1

kabton14

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## Homework Statement

A engine used to raise a lift is 60% efficient, and the lift's mass is 2000kg. How much energy would be needed to raise it to 10m?

## Homework Equations

Efficiency = energy output/ energy input

***100**

## The Attempt at a Solution

E

_{P}=mgh = 2000*9.8*10= 196000 J.

Therefore, eff. = energy output/energy input *100 = (0.6=E

_{OUT}/196000

E

_{OUT}= 0.6*196000=117600 J

Am I on the right track?