A simply supported beam of 0.25-m height, 0.1-m width and 1.5-m span is subjected to a uniform loading of 60 kN/m. Determine the factor of safety for this loading according to (a) the maximum distortion energy theory (von Mises) and (b) the maximum shearing stress theory (Tresca). Use σy = 28 MPa. Note: Bending is the dominant stress to consider.