Question

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(−2.00,1.80,23.4)ft and the point where the cable is attached to the end of the cross member is B(−2.00,−3.20,26.4)ft. The cable's direction is {1.00i−1.00j−1.00k} and it has a tension of 195 lb . What is Ma, the moment that tends to twist the telephone pole due to the tension in the cable applied at point B?

Answer 1