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1st Law of Thermodynamics

What happens ...

Question

What happens when a thermos flask containing liquid is vigorously shaken? Will there be any change in the temperature of the liquid?

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Solution

When the thermos flask is shaken, work is done on the molecules of the liquid in the flask.
By the work-energy theorem, work done is equal to change in energy. And since work is done on the system, its temperature should increase

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