a cantilevered beam is loaded as shown. The cross section at the wall is shown, with points of interest A (at the top), B (at the center), and C (midway between A and B). (a) Sketch the stress elements at points A, B. and C. Calculate the magnitudes of the stresses acting on the stress elements. Do not neglect transverse shear stress. (b) Find the maximum shear stresses (i.e., from Mohr's circle) for the stress elements at A, B, and C. (c) Assuming the critical stress element is the one with the largest maximum shear stress from part (b), which point is critical? (d) If the length of the beam is varied from longer to shorter, the critical stress ele- ment will switch from point A to point B. At what length does this happen? 2 KN 50 mm 200 mm blem 3-46 50 mm Cross section at wall