The right$-$angle boom, which carries the $300-kg$ cylinder, is supported by three cables and a ball$-$and$-$socket joint at $O$ attached to the vertical $x-y$ surface. Draw the free body diagram of the boom on the body to the right, only need to show forces.

Then, determine the tensions in three cables $AC,BD$ and $BE$ and the reactions at $O.$

FBD