Multiple choice technology

Formula to calculate number of indeterminancy in the structure where m - number of members, j - number of joints, r - number of reactions

  1. m+j = 2r

  2. m+j = r

  3. m+2j = r

  4. m+3j = r
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C Correct answer
Explanation

For a 2D truss structure, the formula m + 2j = r is derived from stability conditions where m equals members, j equals joints, and r equals reaction components. This relationship determines structural determinacy.

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