고체역학 (Beer) — Stress and Strain—Axial Loading: Problem 2.46

2.46 The rigid bar $AD$ is supported by two steel wires of $\frac{1}{16}\text{-in.}$ diameter ($E = 29 \times 10^6 \text{ psi}$) and a pin and bracket at $D$. Knowing that the wires were initially taut, determine (a) the additional tension in each wire when a $120\text{-lb}$ load $\mathbf{P}$ is applied at $B$, (b) the corresponding deflection of point $B$.