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In: Mechanical Engineering

Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 =...

Air undergoes a polytropic process in a piston–cylinder assembly from p1 = 1 bar, T1 = 295 K to p2 = 3 bar. The air is modeled as an ideal gas and kinetic and potential energy effects are negligible.
For a polytropic exponent of 1.2, determine the work and heat transfer, each in kJ per kg of air,
(1) assuming constant cv evaluated at 300 K.
(2) assuming variable specific heats.

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