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Dimples on a golf ball reduce its drag by

  • A.Making the surface effectively smoother
  • B.Increasing the ball's frontal area
  • C.Tripping the layer turbulent to delay separation
  • D.Reducing the skin-friction coefficient

Answer: C

The dimples force transition at a lower Reynolds number than a smooth ball would manage, bringing on the drag crisis deliberately. The wake narrows, pressure drag falls, and the ball flies perhaps twice as far as a smooth one would. Friction rises, but it is a small price.

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