A$.$ For cuestions $1$ through $4,$ consider tho truss below loaded with a vertical loud of $800$ lb a joint A and a vortiou excarnal hinge as shown. The mombor lengths and some of the real forces are as shown in the accompanying table. Tako AE as constant.

Tho trblo is employed to computo the vertical deflection at point $B.$

$\backslash$table$[[$Member$,$Length $($in$),L,N(k),n(k),NnL$