Question by Prasanna Professor, I have a doubt regarding the problem 5(c) and 5(d) of assignment 4. I could solve a similar problem[l] where the stagnation pressure and temperature behind the reflected shock is calculated given the speed of the incident shock($v_s$). However, in problem 5, having calculated the required stagnation pressure and temperature to drive the gun tunnel, I am unable to calculate the incident shock speed. It seems I require either the speed of the air behind the incident shock or the speed of the reflected shock to solve the problem. Can this problem be solved without knowing these speeds in prior?
 Question by Prasanna Professor, I'm sorry for repeating the question I asked in class. For the problems in Assignment #6, if I use the weak oblique shock tables, I am able to use only the solution corresponding to the flow deflection angle($\delta$) which are multiples of 2($\delta$=2.0°,4.0°,6.0°...) as given in the table. Using the 'Family of Hodograph Shock Polars' chart, I am unable to use the solution corresponding to precise values of $\delta$, for example, $\delta$=9.1°, if I use a protractor. I could use a root finder program to calculate the wave angle corresponding to an incoming Mach number and a flow deflection angle, but I cannot use that in the quiz. How should I proceed with calculating the solution behind a weak oblique shock for different values of flow deflection angle $\delta$?
 $\pi$