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
Answer:C
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