Question

Why is the efficiency of a real life machine is always less than 100%? Give two reasons.
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Answer 1

Explanation:

The percentage of the work input that becomes work output is the efficiency of a machine. Because there is always some friction, the efficiency of any machine is always less than 100 percent.

Here you go⚡

Answer 2

Answer:

The percentage of the work input that becomes work output is the efficiency of a machine. Because there is always some friction, the efficiency of any machine is always less than 100 percent