The total input energy given to a machine cannot be equal to the total output energy. Explain.?

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Solution

The total input energy given to a machine cannot be equal to the total output energy because it shows an ideal condition and no ideal condition exist, some amount of work is used to overcome friction.
So it will create a difference between input and output energy.
And hence, the total input energy given to a machine cannot be equal to the total output energy.

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