Gas Dynamics (EME415) Model SolutionMidterm Exam #1 November, 2014 7-Term students Fall, 2014/15 Time Allowed: ONE hour Examiner: Adel A. Abdel-Rahman Answer the following questions (1) A projectile is flying with a velocity of 315 m/s in air (P = 45 kPa and T = 247 K). Calculate the Mach number of the projectile and the Mach angle of the pressure-disturbance cone. Sketch the pressure-disturbance pattern of the flow.
(2) At the seashore, you observe a high-speed aircraft moving overhead at an elevation of 2500 m. You hear the plane 6 seconds after it passes directly overhead. Using a nominal air temperature of - 4.5oC, estimate the Mach number and speed of the aircraft.