A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine? A. 92 percent B. 97 percent C. 94 percent D. 96 percent

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The efficiency of the machine is 94 percent. Efficiency = output power/input power ; E = 3,760/ 4,000 ; E = 0.94

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