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Assertion (A): Horizontal buoyancy must be subtracted from a measured drag.

Reason (R): The tunnel's own wall boundary layers thicken along the test section.

Select the correct answer from the options below.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: A

Both are true and the second explains the first. The thickening walls contract the effective area, so the pressure falls downstream and pushes the model rearward exactly as a buoyancy force would. Slightly diverging walls remove the gradient at source.

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