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The work done by a system is 10J, when 4...

The work done by a system is `10J`, when `40J` heat is supplied to it. Calculate the increase in the internal enegry of system.

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`W =- 10 J, q = 40 J`
From the first law, `DeltaU = q +w = 40 - 10 = 30J`
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