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Thermodynamics

Question

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In a process, 701 J of heat is absorbed by a system and 394 J of work is done by the system. What is the change in internal energy for the process?

Solution

Here,
q = +701 J, w = -394 J
According to first law of thermodynamics,
$increment straight U space equals space straight q space plus space straight w space equals space plus 701 straight J space plus space left parenthesis negative 394 space straight J right parenthesis space equals space plus 307 straight J$
i.e. internal energy of the system increases by 307J

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