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Assertion (A): The boom idealisation neglects the booms' own centroidal second moments of area.

Reason (R): The transfer term dominates because the booms sit far from the neutral axis.

Select the correct answer from the options below.

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

Answer: D

Both are true and the second explains the first. A boom of 500 square millimetres at 100 millimetres contributes five million in transfer against a few thousand of its own, so dropping the latter changes nothing of consequence.

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