Question: A cylinder fitted with a piston restrained by a linear spring contains 2 lbm of R-22 at 220 F, 125 lbf/in 2. The system is

A cylinder fitted with a piston restrained by a linear spring contains 2 lbm of R-22 at 220 F, 125 lbf/in 2. The system is shown in Fig. P6.72 where the spring constant is 285lbf/in, and the piston cross-sectional area is 75 in 2. A valve on the cylinder is opened and R-22 flows out until half the initial mass is left. Heat is transferred so the final temperature of the R-22 is 30 F. Find the final state of the R-22, (P2, x2), and the heat transfer to the cylinder.

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