In a certain thermodynamic process, 400 J of heat flows into a system, and at the same time the system expands against a constant external pressure of 8.00 × 10^4 Pa. If the volume of the system increases from 0.026 m^3 to 0.090 m^3, calculate the change in internal (thermal) energy of the system. If the internal (thermal) energy change is nonzero, be sure to indicate whether this energy change is positive or negative.

In a certain thermodynamic process, 400 J of heat flows into a system, and at the same time the system expands against a constant external pressure of 8.00 × 10^4 Pa. If the volume of the system increases from 0.026 m^3 to 0.090 m^3, calculate the change in internal (thermal) energy of the system. If the internal (thermal) energy change is nonzero, be sure to indicate whether this energy change is positive or negative.

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