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CQ 7-1: Suppose, during a certain period of time during its equilibrium state, 6000 joules of energy are transferred to a device, and the device

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CQ 7-1: Suppose, during a certain period of time during its equilibrium state, 6000 joules of energy are transferred to a device, and the device transfers out 4500 joules useful energy. What is the efficiency of the device? A. 100% B. 133% C. 75% D. 45% E. 25%

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