Steam enters a nozzle at 4 MPa and 640°C with a velocity of 20 m/s. This process may be considered reversible and adiabatic. The nozzle exit pressure is 0.1 MPa. (a) Draw a sketch of this process. Include all known information. (b) What is the entropy change of the steam? (c) What is the exit temperature? (d) What is the exit velocity?