(Solved): An old wooden telephone pole with a single cross member was blown off center during a recent storm. ...

An old wooden telephone pole with a single cross member was blown off center during a recent storm. To temporarily stabilize the telephone pole, a repair crew has attached a cable from the end of the cross member to an eye-ring stake anchored in the ground. (Figure 3 ) If the origin $O$ of a coordinate system is placed where the pole meets the ground, the point where the cross member is attached to the pole is $A(?1.60,2.30,23.4)\mathrm{ft}$ and the point where the cable is attached to the end of the cross member is $B(?1.60,?2.70,26.4)\mathrm{ft}$. The cable's direction is $\{1.00\mathbf{i}?1.00\mathbf{j}?1.00\mathbf{k}\}$ and it has a tension of $135\mathrm{lb}$. What is $M_{\mathrm{a}}$, the moment that tends to twist the telephone pole due to the tension in the cable applied at point $B$ ? Express your answer numerically in pound-feet to three significant figures.