why is the efficiency of a machine always less than 100%
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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.
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1
Answer:
i . a part of input work is wasted in overcoming friction and
ii. a part of input work is wasted in moving the parts of the machine.
Therefore, the efficiency of a practical machine is always less than 100%
Explanation:
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