3) A hinge is a double constraint which restraints:a)a translation and a rotation in the plane;b)a rotation in the plane;c) two translations in the plane.4) The Mohr's arbelos is the region in the plane of the special stress components σ- which defines:a) all and the only possible stress states in the neighborhood of a point of a continuum, at varyingnormal vector in that point;b) among the possible stress states defined in the neighborhood of a point of a continuum, only thosewhich are principal;c) all the possible stress states in the neighborhood of a point of a continuum for which the stresstensor is diagonal.5) The first invariant of the stress tensor is a measure of:a) the volume deformation about a point of a body;b) the deviatoric component of the stress tensor in a point of a body;c) the average normal stress component in a point of a body.

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