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.