Solved: In Fig. 12-37, a 55 kg rock climber is in a

Chapter , Problem 22

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In Fig. 12-37, a 55 kg rock climber is in a lie-back climb along a fissure, with hands pulling on one side of the fissure and feet pressed against the opposite side. The fissure has width w = 0.20 m, and the center of mass of the climber is a horizontal distance d = 0.40 m from the fissure. The coefficient of static friction between hands and T 11 1 rock is ILl = 0.40, and between boots Fig. 12-37 22. and rock it is fL2 = 1.2. (a) What is the least horizontal pull by the hands and push by the feet that will keep the climber stable? (b) For the horizontal pull of (a), what must be the vertical distance h between hands and feet? If the climber encounters wet rock, so that ILl and fL2 are reduced, what happens to (c) the answer to (a) and (d) the answer to (b)?