Discussion
A flat plate is set at \( 5 \) degrees incidence in a stream at \( M = 2 \). By linearised theory its lift coefficient is nearest to
Answer: A
The Ackeret result gives \( c_l = 4\alpha/\sqrt{M^2-1} \). Here \( \alpha = 0.0873 \) radians and \( \sqrt{3} = 1.732 \), so \( c_l = 4 \times 0.0873 / 1.732 = 0.202 \). The distractor 0.548 is the subsonic two pi alpha value, which does not apply above Mach one.
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