A closed gaseous system undergoes a reversible process during which 25 BTU are rejected, the volume changing from 5 ft3 to 2 ft3, and the pressure remains constant at 50 psia. Find the change of internal energy.
∆U=Q−p∆V=14 BTU.∆U=Q-p∆V=14~BTU.∆U=Q−p∆V=14 BTU.
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