Question

Select the correct answer to the following multiple-choice questions. Briefly explain your choice.

7. If we use a plane of symmetry to solve a stress-analysis problem for just have of the geometry, and the plane of symmetry the reaction forces will be
    A) all zero,
    B) parallel to the plane of symmetry,
    C) orthogonal to the plane of symmetry,
    D) none of the above.

Answer 1

(C) orthogonal to thw plane of symmetry.

Note that when we are doing a 2D analysis and consider a plane of symmetry, is always orthogonal to the plane on qhich all the forces lie. Thus the forces' plane and the plane of symmetry are orthogonal.