An isolated thermodynamic system, composed of an ideal gas, completes a cycle reversible consisting of an isothermal expansion (1-2), an isochoric cooling (2-3) and an adiabatic transformation (3-1). Knowing that V2= 3V1, and that = 7/5 = 1.4, Calculate:
a) The thermal efficiency of the cycle.
b) Is the gas monoatomic or diatomic cycle?
c) The change in entropy of the individual transformations of the system and in the whole cycle.
d) The change in entropy of the universe.
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