The 70.0-kg climber in Fig. 4-72 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 ver- tical and that the static friction forces are both at their maximum. Ignore his grip on the rope. FIGURE 4–72 Problem 89.

The 70.0-kg climber in Fig. 4-72 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 ver- tical and that the static friction forces are both at their maximum. Ignore his grip on the rope. FIGURE 4–72 Problem 89.

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Chapter1: Units, Trigonometry. And Vectors

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Question

The 70.0-kg climber in Fig. 4-72 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 ver-
tical and that the static friction
forces are both at their maximum.
Ignore his grip on the rope.
FIGURE 4–72
Problem 89.

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