4) The frame supports the distributed loading of X (N/m). Determine the normal and shear stresses at point D that act perpendicular and parallel, respectively, to the grain.The grain at this point makes an angle of 30 with the horizontal as shown. X (N/m) 75 mm 1200 200 mm D -1.5 m- H 100 mm X=165 4 m 1.5 m 30 1 m 60 30 mm 100 mm 50 mm