Q.4.: ( \( \mathbf{2 0} \) pts.): The figure shows a bracket machined out of steel having \( S_{\text {ut }}=\mathbf{6 0} \) kpsi ; the bracket has a rectangular cross sectional area of \( 0.5 \mathrm{in} \times 1 \mathrm{in} \) and subjected to the variable loading shown. Calculate the fatigue factor of safety for infinite life at point \( B \) using Goodman method. Neglect any possible stress concentration. Note: dimensions are not to scale