A system absorbs $640 J$ heat and does work of $260 J$ , the change in internal energy of the system will be:

+ 380 J

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- 380 J

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+ 900 J

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- 900 J

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Solution

The correct option is A $+ 380 J$
The system absorbs $640 J$ and the work system does on surroundings is $260 J$ . Therefore by the first law of thermodynamics, the internal energy of the system increases by:
$△ U = q - W = (640 - 260) = + 380 J$ .

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