Consider a Truss Designed to Support Some Maximum Weight W

Multiple Choice

Consider a truss designed to support some maximum weight W on a frictionless, horizontal surface. The truss has three straight members joined as in the letter "A," and all members of the truss are weightless. W is placed at the apex of the truss. The force(s) at the center of the horizontal cross member is (are)

A) compressional.
B) tensional.
C) either of the above, depending on the vertical location of the horizontal cross member.
D) none of the above.