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13. A fossil fuel generator is being used to produce electricity. When 1000 kJ of energy is put into the system, 600 kJ of energy

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13. A fossil fuel generator is being used to produce electricity. When 1000 kJ of energy is put into the system, 600 kJ of energy is wasted, so that only 400 kJ of energy is available to do useful work. Using these measurements, calculate the efficiency and percent efficiency of the fossil fuel generator. (4 marks) TS

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