1) The Huber-Hencky-von Mises strength criterion:a) takes the deviatoric component of the second invariant of the stress tensor as reference quantity toassess whether the stress state in a 3D body is inside a safe domain or not;b) is always safer than the Tresca-Guest strength criterion;c)sometimes it can be stricter than the Tresca-Guest strength criterion.2) Given the following system of beams, the left rotation of the cross section in B, via Mohr's Theorem andCorollaries, yields:a) Bleft=16 PL²3 EJLBEFL/2L/2L/2L/23PL²b) Bleft16 EJc) None of the others.

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