4. The following structure is made of AISI 1006 cold-drawn steel (Sy=280MPa) and it is loaded by the forces F=0.55 kN, P=8.0 kN and T=30 Nm. The factor of safety for a machine element depends on the particular point selected for the analysis. Using Tresca failure theory, determine the factor of safety for points A and B. 15 points B 100 mm 20-mm D. T X