Three processes compose a thermodynamic cycle shown in the accompanying pV diagram of an ideal gas. Process 1 → 2 takes place at constant temperature. During this process 60 J of heat enters the syste

Question

Three processes compose a thermodynamic cycle shown in the accompanying pV diagram of an ideal gas. Process 1 → 2 takes place at constant temperature. During this process 60 J of heat enters the system. Process 2 → 3 takes place at constant volume. During this process 40 J of heat leaves the system. Process 3 → 1 is adiabatic. What is the change in internal energy of the system during process 3 → 1?

TestHub · Accepted Answer

1 → 2 isothermal: Δ U 12 ​ = 0 . 2 → 3 isochoric: Δ W = 0 ⇒ Δ Q 23 ​ = Δ U 23 ​ = − 40 J. Cyclic process: Δ U 12 ​ + Δ U 23 ​ + Δ U 31 ​ = 0 ⇒ 0 + ( − 40 ) + Δ U 31 ​ = 0 . Δ U 31 ​ = + 40 J.

Physics - Heat & Thermo Question with Solution | TestHub

Options:

Doubts & Discussion