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The step in shear flow at a boom is proportional to

  • A.The skin thickness
  • B.Its first moment about the neutral axis
  • C.The boom area alone
  • D.The distance from the neutral axis alone

Answer: B

The step is the shear force over the second moment of area, times the boom's first moment about the neutral axis. A boom on the neutral axis therefore produces no step at all, whatever its area, which is a useful check on a calculation.

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