(Solved): The rigid horizontal bar \( A D \) is supported by two steel wires of \( 1 / 4 \)-in diameter \( \ ...

The rigid horizontal bar \( A D \) is supported by two steel wires of \( 1 / 4 \)-in diameter \( \left(E=29 \times 10^{6} \mathrm{psi}\right) \) and a pin and bracket at \( A \). Knowing that the wires were initially taut, determine the magnitude of the deflection of point \( D \) when a 400 -lbs load \( \mathbf{P} \) is applied at \( D \).