**Please do not use other websites answers, all of them wrong. **

(a) A flat plate is placed in a supersonic stream, aligned with the flow direction. Weak waves caused by roughness on the plate are observed. Determine the Mach number of the supersonic stream when the waves are at the following angles to the flow direction and comment on the trend found: (i) 60 (ii) 30 (iii) 15 (b). Consider a flat plate at an angle of attack to a Mach 2.8 airflow at 1 atm pressure. What is the maximum pressure that can occur on the plate surface and still have an attached shock wave at the leading edge? At what value of does this occur? [Note: Consider only the weak oblique shock solutions from the --M chart for this problem.]