Discussion
Assertion (A): A cambered airfoil has a negative zero-lift angle of attack.
Reason (R): Camber allows a section to generate lift at zero geometric incidence.
Select the correct answer from the options below.
Answer: D
Both are true and connected: because the cambered section already lifts at zero incidence, it must be pitched nose-down before the lift vanishes, giving a negative zero-lift angle. A symmetric section reaches zero lift at zero degrees.
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