Consider the purely subsonic flow in a convergent-divergent duct. the inlet, throat and exit area are l m^2, 0.7 m^2 and 0.85 m^2, respectively. if the inlet mach number and pressure are 0.3 and 0.8 times 10^5 n/m^2, respectively, calculate: a) m and p at the throat, (b) m and p at the exit.

If you visited mount shasta city (elevation 900 m [3000 ft.]) and found the outside air temperature to be 27°c (81°f), what would be the air temperature at the summit of mount shasta (elevation 4200 m [14,000 ft.]) at that moment-assuming that the temperature conditions with altitude change at an average, or normal, lapse rate?