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Q: .
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  • A. 100 t compressive
  • B. 100 t tensile
  • C. zero
  • D. indeterminate
Correct Answer: Option C - The fore in member DC is zero. Note–If three members form a truss joint for which two of the members are collinear and there is no external load or reaction at that joint, then the third non-collinear member is a zero force member.
C. The fore in member DC is zero. Note–If three members form a truss joint for which two of the members are collinear and there is no external load or reaction at that joint, then the third non-collinear member is a zero force member.

Explanations:

The fore in member DC is zero. Note–If three members form a truss joint for which two of the members are collinear and there is no external load or reaction at that joint, then the third non-collinear member is a zero force member.