The spring-loaded piston-cylinder device shown in Fig. P4-43 is filled with 0.5 kg of wate...

The spring-loaded piston-cylinder device shown in Fig. P4-43 is filled with 0.5 kg of water vapor that is initially at 4 MPa and 400°C. Initially, the spring exerts no force against the piston. The spring constant in the spring force relation F = kx is k = 0.9 kN/cm and the piston diameter is D = 20 cm.The water now undergoes a process until its volume is one-half of the original volume. Calculate the final temperature and the specific enthalpy of the water.