4-35 A piston-cylinder device initially contains steam Es at 200 kPa, 200°C, and 0.4 m³. At this state, a linear spring (Fox) is touching the piston but exerts no force on it. Heat is now slowly transferred to the steam, causing the pressure and the volume to rise to 250 kPa and 0.6 m³, respectively. Show the process on a P-V diagram with respect to saturation lines and determine (a) the final temperature, (b) the work done by the steam, and (c) the total heat trans- ferred. Answers: (a) 606°C, (b) 45 kJ, (c) 288 kJ О H₂O 200 kPa 200°C FIGURE P4-35