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An ideal gas undergoes a cycle consisting of the following mechanically reversible steps: An adiabatic compression from Pu V1, T1 to P2, V2, T2 An isobaric expansion from P2, V2, T2 to P3 P2, Vs, T3 - An adiabatic expansion from P3, Vs, Ts to Pa, V4, T4 - A constant-volume process from Pa, V4, T4 to Pi, VV4, T1 (a) Sketch this cycle on a PV diagram (b) Derive an equation that expresses the thermal efficiency (n) of this process as a function ofy, Ti, T2 and Ts. Your final equation should not contain any pressure, mole or volume terms. (c) Calculate the efficiency of this process if the gas is Argon with Tl-300°C, T2-1200°C, and T,- 1700°C.

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