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Question

A system absorbs 500 J of heat and performs 200 J of work. What is the change in internal energy (Δ U)?

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Explanation

Using the first law: Δ U = q + w. Here, q = +500 J (heat absorbed), w = -200 J (work done by system), so Δ U = 500 - 200 = 300 J.

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