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Asked Dec 23, 2019
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What happens to the internal energy of a system when mechanical work is done on it? What happens to its temperature?

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Expert Answer

Step 1
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By the first law of thermodynamics: ..(1) ΔQΔUU+W

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Step 2
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The mechanical work on the system means the system compressed or work is negative. From equation (1): ΔQΔυU+W Δυ-Δ-W AU = AQ – (-W) Δυ- ΔQ+W %3D

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Step 3
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Hence the internal energy is increases. Now, by the specific heat a constant volume formula: AU = C_đT or, AU c dT

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