Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will_________________?
Correct answer: A. Increase
- A. Increase
- B. Decrease
- C. Remain unchanged
- D. First fall and then rise
Explanation
A thermos flask greatly limits heat transfer, so the shaking work is dissipated internally as thermal energy and the tea temperature increases slightly. This assumes the flask is sufficiently insulated and the shaking is vigorous enough to produce measurable viscous dissipation.
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