A lever subjected to a downward static force of 400 lbs. is keyed to a 1-in round bar as shown in the figure. (a) Determine the values of the principal stresses at point A. Point A is located on the top surface of the round bar as shown in the figure. (b) The bar has a yield strength of 94 kpsi. Based on a static load, and using point A as the critical point, find the factor of safety by using the distortion-energy theory. (c) Find the factor of safety using the maximum -shear-stress theory. Should the result be greater or less than that obtained in part (b)? Why? A 9-- 1" D. F= 400 lb