A man raises a joist $($length $=l)$ by pulling a rope attached to point $B.$ The centre of mass is located at the centre of the

beam and the system is at equilibrium.

Hints:

The reaction does not necessarily act along the joist.

This question can be solved without the use of simultaneous equations $($Use $3$ Force Bodies$).$

Given the information in the table above, determine:

the angle of the resultant reaction, $,$ at point $A$ if at that point the ledge acts as a rough surface.

$[$degrees$],(3$ sigfig, measured anti$-$clockwise from the positive $x-$axis $-Z)$