Nitrogen at (25 mathrm{psia}) and (850^{circ} mathrm{R}) is flowing at a Mach number of 2.54. After expanding

Question:

Nitrogen at $25 \mathrm{psia}$ and $850^{\circ} \mathrm{R}$ is flowing at a Mach number of 2.54. After expanding around a smooth convex corner, the velocity of the nitrogen is found to be $4000 \mathrm{ft} /$ sec. Through how many degrees did the flow turn?

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