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A system does `40J` work on surrounding as well as gives out `20J` energy. Calculate the change in internal energy.

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A system does `40J` work on surrounding as well as gives out `20J` energy. Calculate the change in internal energy.
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`w=-40 J, q=-20 J`
`DeltaU=q+w`
`DeltaU=-20+(-40)=-60 J`
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