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A hot cup of coffee is kept on the table. After some time it attains a thermal equilibrium with the surroundings. By considering the air molecules in the room as a thermodynamic system, which of the following is true? (a) ∆U > 0, Q = 0 (b) ∆U > 0, W < 0 (c) ∆U > 0, Q > 0 (d) ∆U = 0, Q > 0 |
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Answer» (c) ∆U > 0, Q > 0 |
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