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A Carnot engine takes 5000 kcal of heat from a reservoir at 727°C and gives heat to a sink at 127°C. The work done by the engine is

1. 3 × 10 6 J
2. Zero
3. 12.6 × 10 6 J
4. 8.4 × 10 6 J

Correct answer: 12.6 × 10 6 J

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