3. A 6-kip force is applied to the machine element AB at point A as shown. Knowing that the uniform thickness of the element is 0.8 in, determine the normal and shearing stresses at (a) point a, (b) point b, and (c) point c. 1.5 in. 1.5 in. B 8 in. 8 in. 6 kips 8 in.