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A cylinder with a piston restrained by a linear spring contains 4 lbm of carbon dioxide at 70 lbf/in.2, 750 F. It is cooled to 75 F, at which point the pressure is 45 lbf/in.2. Calculate the heat transfer for the process. 

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C.V. The carbon dioxide, which is a control mass. 

Continuity Eq.: m2 – m1 = 0

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