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Question

The efficiency of a machine is 90%. If 100 J of work is done by the effort, how much work is obtained at the load of the machine?


A
50 J
loader
B
60 J
loader
C
90 J
loader
D
100 J
loader

Solution

The correct option is C 90 J
Given, 
Efficiency η=90100=0.9
Work done by effort or WInput=100 J
Work done by load (WOutput)=?

We know that,
η=WOutputWInput
WOutput=η×WInput
                   =0.9×100
                   =90 J

Physics

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