고체역학 (Beer) — Shearing Stresses in Beams: Problem 6.36

6.35 and 6.36 An extruded aluminum beam has the cross section shown. Knowing that the vertical shear in the beam is 150 kN, determine the shearing stress at (a) point a, (b) point b. Note: Problem 6.36 refers to the second cross-section diagram where the total width and height are both 80 mm.