A piston-cylinder device contains 40 kg of water at 150 kPa and 30oC. The cross-sectional area of the piston is 0.1 m2. Heat is now added causing part of the water to evaporate. When the volume reaches 0.2 m3, the piston reaches a linear spring with a spring constant of 120 kN/m. More heat is added until the piston moves by another 25 cm. Determine.
(a) The final pressure.
(b) Temperature.
(c) The total heat transfer.