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(1) A cycle with ideal gas operates as follows:
(i) From an initial state (p₁, V₁) the gas is cooled at constant pressure to (p₁, V₂);
(ii) The gas is heated at constant volume to (p2, V₂);
(iii) The gas is expanded adiabatically back to (p₁, V₁).
Show that the efficiency of this cycle is
n=1-y
(V₁/V₂) - 1
(P₂/P₁) - 1*

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