Beer & Johnston — Stress and Strain—Axial Loading: Problem 2.95

2.95 A hole is to be drilled in the plate at \(A\). The diameters of the bits available to drill the hole range from \(\frac{1}{2}\) to \(1\frac{1}{2}\) in. in \(\frac{1}{4}\)-in. increments. If the allowable stress in the plate is \(21 \text{ ksi}\), determine (a) the diameter \(d\) of the largest bit that can be used if the allowable load \(P\) at the hole is to exceed that at the fillets, (b) the corresponding allowable load \(P\).