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Why is the efficiency of a machine always less than 100 percent?
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Why is the efficiency of a machine always less than 100 percent?

User MohammadL
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Answer:A

Step-by-step explanation:

User Simon Chadwick
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Because of friction the work done by a machine is always less than the work done on the machine thus there is always some friction the efficiency of any machine is always less than 100 percent.
User Evin
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