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4. Consider a heat engine comprising two isochores and two isobars, as in the
diagram below. Suppose vertices 2 and 4 are connected by an isotherm of
temperature To, while the temperatures at vertices 1 and 3 are T₁ and T3,
respectively. Compute the efficiency of this cycle.
р
To 2
T₁ 1
3 T3
4 To
α

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