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Discussion

A student solves a closed section by cutting it at a different place from the textbook and gets a different distribution. The most likely explanation is

  • A.That closed sections have no unique solution
  • B.That the section must be symmetric for the method to work
  • C.An arithmetic error, since the cut position cannot change the answer
  • D.That the cut position genuinely changes the result

Answer: C

The redundant flow restored after the cut compensates exactly for it, so the final distribution is independent of where the cut was made. A discrepancy therefore points to an error, most often in the compatibility integral.

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