$A$ sample of liquid in a thermally insulated container (a calorimeter) is stirred for $2 \ hr$ by a mechanical linkage to a motor in the surroundings. For this process:
- A$w < 0; q = 0; \Delta U = 0$
- B$w > 0; q > 0; \Delta U > 0$
- C$w < 0; q > 0; \Delta U = 0$
- D$w > 0; q = 0; \Delta U > 0$
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