PROBLEM 1.1 The air pressure and density at a point on the wing of a Boeing 747 are 1.10 x 105 N/m² and 1.20 kg/m³, respectively. What is the temperature at that point? PROBLEM 1.2 Using equations, determine the temperature, pressure and density of the air for a aircraft flying at 19.5 km. Is this aircraft subsonic or supersonic? PROBLEM 1.3 If an airplane is flying at an altitude where the actual pressure and temperature are 4.72 x 104 N/m² and 255.7 K, respectively, what are the pressure, temperature, and density altitudes? Hint: Use linear interpolation, tables and Ideal gas assumption.