Discussion
Match the theory in List I with the quantity it predicts in List II.
List I
A. Thin airfoil theory
B. Kutta-Joukowski theorem
C. Kelvin's theorem
D. Bernoulli's equation
List II
1. Lift per unit span from circulation
2. Conservation of circulation and the starting vortex
3. Lift curve slope of two pi per radian
4. The relation between local pressure and local speed
Select the correct match.
Answer: D
Each result belongs to a distinct step of the classical argument: Bernoulli relates pressure to speed, Kutta-Joukowski converts circulation into lift, Kelvin explains where the circulation comes from, and thin airfoil theory supplies the slope.
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