Discussion
Air at \( 100 \) kPa and \( M = 2 \) expands to \( M = 3 \). The static pressure afterwards is
Answer: D
The static pressure ratio for this expansion is 0.213, so \( 100 \times 0.213 = 21.3 \) kPa. Nearly four fifths of the pressure has been given up in exchange for one unit of Mach number, and none of it has been lost to entropy: the stagnation pressure is untouched.
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