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Modal responses are combined by the square root of the sum of squares because the peaks

  • A.occur simultaneously in all modes
  • B.do not occur at the same instant
  • C.are always of opposite sign
  • D.are equal in every mode

Answer: B

Adding the peaks directly would assume they coincide, which they do not, so the result would be unrealistically large. The square root of the sum of squares is the statistical estimate for modes with well separated periods.

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