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Assertion (A): Shear flow analysis of a wing box must account for the section being closed.

Reason (R): A closed section under shear has no free edge at which the flow is known.

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 statements are true and the second explains the first. Treating the box as open would leave the redundant constant unaccounted for and give a distribution that does not satisfy compatibility, misplacing the shear flows around the section.

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