14:10
Vector Mechanics for Engineers: Statics and Dynamics
Before the trunk of a large tree is felled, cables $A B$ and $B C$ are attached as shown. Knowing that the tensions in cables $A B$ and $B C$ are $555 \mathrm{~N}$ and $660 \mathrm{~N},$ respectively, determine the moment about $O$ of the resultant force exerted on the tree by the cables at $B$.