Discussion
Assertion (A): Dimpling a golf ball reduces its drag.
Reason (R): The dimples trip the boundary layer turbulent, so separation moves aft and the wake narrows.
Select the correct answer from the options below.
Answer: C
Both statements are true and the second is the reason for the first. Deliberately bringing on the drag crisis at a lower Reynolds number collapses the pressure drag, which dominates for a bluff body. The friction penalty is trivial beside the saving, and the ball flies about twice as far.
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