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Expression for the efficiency of the machine

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Reference no: EM131060049

An amount Q of energy is supplied to a machine. The machine does useful work W and an amount R of energy is wasted. Which one of the following is a correct expression for the efficiency of the machine?

A. W/Q
B. R/Q
C. (W+R)/Q
D. (W-R)/Q

Reference no: EM131060049

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