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Which statement about a two-cell box under torque is TRUE?

  • A.Both cells must twist at the same rate
  • B.Both cells must carry the same shear flow
  • C.The cells can be analysed independently
  • D.The shared web carries the sum of the two flows

Answer: A

Correct answer: Both cells must twist at the same rate

The two cells share a web and belong to one structure, so compatibility requires them to have the same rate of twist. That condition, together with equilibrium of the total torque, is what determines how the shear flow divides between them. The flows are generally unequal, and the shared web carries their difference, not their sum.

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