Computers

Question

Which is true about the efficiency

of machines?

A. Efficiency is always 100%.

B. Efficiency is greater than 100%.

C. Efficiency is less than 100% because of

friction.

D. Efficiency is always 0% because of mechanical

advantage.

Answer

C. Efficiency is less than 100% because of friction.

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The efficiency of machines is always less than 100% because of friction. Friction is the resistance to motion between two surfaces that are in contact with...