고체역학 (Beer) — Shearing Stresses in Beams: Problem 6.97

6.97 A plate of thickness \( t \) is bent as shown and then used as a beam. For a vertical shear of 600 lb, determine (a) the thickness \( t \) for which the maximum shearing stress is 300 psi, (b) the corresponding shearing stress at point \( E \). Also sketch the shear flow in the cross section.