Prob. 4.3-2. In Fig. P4.3-2 a mechanic (not shown) is using an X-style lug wrench to remove an automobile wheel by ex- erting equal forces P downward at C and upward

at D. This creates a pure torque on arm AB, which is a rod 0.5 in. in diameter and 6.0 in. in length. (See also Fig. 4.1 at the begin- ning of this chapter.) The total length between the forces at C and D is 2b = 15 in. (a) Because the lug nut at A is very