A closed system consisting of 14.5 lb of air undergoes a
Chapter 2, Problem 2.31(choose chapter or problem)
A closed system consisting of 14.5 lb of air undergoes a polytropic process from \(p_{1}=80 \mathrm{lbf} / \mathrm{in}^{2}, v_{1}=4 \mathrm{ft}^{3} / \mathrm{lb}\) to a final state where \(p_{2}=20 \mathrm{lbf} / \mathrm{in.}^{2}, v_{2}=11 \mathrm{ft}^{3} / \mathrm{lb}\). Determine the amount of energy transfer by work, in Btu, for the process.
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