$*2-56.$ Three forces act on the bracket. Determine the magnitude and direction $$ of $F_2$ so that the resultant force is directed along the positive $u$ axis and has a magnitude of $50$ lb $.$

$2-57.$ If $F_2=150lb$ and $=55,$ determine the magnitude and direction measured clockwise from the positive $x$ axis, of the resultant force of the three forces acting on the bracket.

Probs. $2-56/57$