You are an engineering intern at a manufacturer of mechanical tools, your senior engineer asked you to evaluate the stresses on a newly-design utility hook, shown in Figure.6, to confirm it's not exceeding its yield strength. The hook dimensions are (d, D;, L) = (20, 75, 250) mm. The task can be completed by calculating the stresses at the inner and outer surfaces of section A A when the load is F = 4 kN. L A D; F D Figure.6: Utility hook