24 @ %= InFig 12-41,a climber with a weight of 533.8 N is held by a belay rope connected to her climbing harness and belay device; the force of the rope on her has a line of action through her center of mass. The indi- cated angles are #=40.0 and = 30.0. If her feet are on the verge of sliding on the vertical wall, what is the coefficient of static friction between her climbing shoes and the wall? 25 ssM WWW In Fig. 12-42, what magnitude of (constant) force F ap- plied horizontally at the axle of the wheel is necessary to raise the wheel over a step obstacle of height h = 3.00 cm? The wheel's radius is r = Figure 12-40 Problem 23. Figure 12-41 Problem 24