1. A 70.0-kg climber is supported in the "chimney" by the friction forces exerted on his shoes and back. The static coefficients of friction between his shoes and the wall, and between his back and the wall, are 0.80 and 0.60, respectively. What is the minimum normal force he must exert? Assume the walls are vertical and that the static friction forces are both at their maximum. Ignore his grip on the rope.
2. Three blocks on a frictionless horizontal surface are in contact with each other. A force, F, is applied to block A (mass A). Each block has a mass of 10 kg. (a) Draw a free-body diagram for each block. Determine (b) the acceleration of the system (c) the net force on each block, and (d) the force of contact that each block exerts on its neighbor.