고체역학 (Beer) — Stress and Strain—Axial Loading: Problem 2.15

2.15 A single axial load of magnitude $P = 15 \text{ kips}$ is applied at end $C$ of the steel rod $ABC$. Knowing that $E = 30 \times 10^6 \text{ psi}$, determine the diameter $d$ of portion $BC$ for which the deflection of point $C$ will be $0.05 \text{ in.}$