Solve the below problem:
Q: Calculate the stagnation temperature and pressure for the following substances flowing through a duct:
(a) Helium at 0.25 MPa, 50°C, and 240 m/s
(b) Nitrogen at 0.15 MPa, 0°C, and 300 m/s; and
(c) Steam at 0.1 MPa, 350°C, and 480 m/s