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← Nature & AnimalsWhich lift reduction occurs when bird feathers separate?
A)Stall speed increases dramatically✓
B)Airflow becomes completely laminar
C)Boundary layer thickness diminishes
D)Turbulence intensity immediately decreases
💡 Explanation
Lift degrades because flow separation increases parasitic drag; this is profile drag, therefore the stall speed rises leading to lift stall, rather than a decrease because cohesion along the structure is failing.
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