Determine the temperature, volume, and quality for one kg water under the following conditions: a. U = 3000 kJ/kg, P = 0.3 MPa

b. U = 2900 kJ/kg, P = 1.7 MPa

c. U = 2500 kJ/kg, P = 0.3 MPa

d. U = 350 kJ/kg, P = 0.03 MPa

Using steam tables, I think I got the values for a, but I am so confused about b-d

Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 k, 1 bar, with a volumetric flow rate of 0.25 m°/s, and exits at 325 k, 0.95 bar. the flow area is 0.04 m2. assuming the ideal gas model with k = 1.4 for the air, determine (a) the velocity at the inlet and exit, each in m/s, and (c) the rate of heat transfer, in kw flow rate, in kg/s, (b) the mass kg 0.3