a) Angle of attack of the wing and the angle of attack
b) Angle of attack of the wing and the angle of attack of the vertical tail
c) Angle of attack of the wing and the angle of incidence
d) Angle of incidence and the angle of attack of the vertical tail
Answer: b
Explanation: The two major sources of change in the aerodynamic forces and moments applied to an aircraft are the angle of attack of the wing and the angle of attack of the vertical tail. The two angles are important to maintain the center of gravity of an aircraft.
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