A sample of liquid in a thermally insulated container (a calorimeter) is stirred by a motor. Taking liquid as a system for this process choose the appropriate option:
- Aw < 0; q = 0; ΔU = 0
- Bw > 0; q > 0; ΔU > 0
- Cw 0; ΔU = 0
- Dw > 0; q = 0; ΔU > 0
✓ Correct answer: D
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