20.8 (USCS units) The shear strength of a certain work material = 50,000 lb/in². An orthogonal cutting operation is performed using a tool with rake angle = 20° at a

cutting speed = 100 ft/min, chip thickness before the cut = 0.015 in, and width of cut = 0.150 in. The resulting chip thickness ratio = 0.50. Determine(a) the shear plane angle, (b) shear force, (c) cutting force and thrust force, and (d) friction force.