What is the efficiency of a machine which does a work of 400 N when a work of 500 N is done on it?

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Solution

Efficiency $= \frac{output work}{input work}$
Given output work = 400 N
input work = 500 N

Efficiency $= \frac{400}{500} = 4 / 5$

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If the efficiency of a machine is $10 %$ and the work done on a machine is $2000 J$ , then what is the work done by the machine?

The efficiency of a machine is the ratio of the work done on the load by the machine to the work done on the machine by the effort.

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