thermodynamics please help answer soon as possible im begging

QUESTION 2 [25 MARKS] a) Air enters an adiabatic turbine with the inlet and exit conditions are shown in Figure 2. The ratio of inlet area to exit area is 0.4. Determine the work done by the turbine (kJ/kg) T: = 387C P. - 4 MPa V: - 30 m's T: 177C P. - 2 MP Figure 2 [10 Marks) [CO2, PO2, C3] b) A rigid tank (1 m) contains water at 250 C with 40% quality. The tank is connected by a valve to supply line that carries the water at 5 MPa and 200 C. Now the valve is opened and the water is allowed to enter the tank. The valve is closed when the pressure and temperature in the tank reach 2 MPa and 150 C. respectively. Determine the heat transfer during the process (kJ). [15 Marks) [CO2, PO2, C3]