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A system absorbs 600 J of heat and work equivalent to 300 J on its surroundings. The change in internal energy is

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300 J

400 J

500 J

600 J

answer is A.

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Detailed Solution

We know that $∆$ = Q + W = 600 + (-300) = 300 J
W = - 300, because the work is done by the system

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