Question

A system does 300 J of work at the same time that 1000 J of energy is transferred to the system as heat. What is the change in the system's internal energy?

Answer 1

The heat given q equals the work done, plus the change in internal energy of the gas or the change in internal energy equals the heat given minus the work done by the gas. So the change in internal energy is 1000 joules, minus 300 joules or the internal energy of the gas increases by 700 toutes.

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