Air of mass 2 kg is compressed reversibly and adiabatically from an initial state at 1.2 kPa, 28°C
to 2 MPa and then expanded at a constant pressure to the original volume.
(i) Sketch the process on the p-V plane;
(ii) Determine the heat and work transfer.
Take for air, assume R = 0.287 kJ/kgK and Cv = 0.713 kJ/kgK.
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