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A thermos bottle containing coffee is vi...

A thermos bottle containing coffee is vigorously shaken. Consider coffee as a system: Has its internal energy changed ?

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`DeltaQ=DeltaU+Delta` But `DeltaQ=0,thereforeDeltaU=-DeltaW`, here `DeltaW`is negative because work is done on the system. Now A [7 is positive, hence internal . energy of the system increases
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