Physics
7th Edition
ISBN: 9780321733627
Author: Douglas C. Giancoli
Publisher: PEARSON
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Chapter 4, Problem 23P
Arlene is to walk across a “high wire" strung horizontally between two buildings 10.0 m apart. The sag in the rope when she is at the midpoint is 10.0°, as shown in Fig. 4-47. If her mass is 50.0 kg, what is the tension in the rope at this point?
Figure 4-47
Problem 23.
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4-54. The spool has a mass of 200 kg and rests against the
wall and on the floor. If the coefficient of static friction at B
is (4)e = 0.3, the coefficient of kinetic friction is
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0.4 m
0.1 m
A stone hangs by a fine thread from the ceiling, and a
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the stone (Fig. 4–36). If a person gives a sharp pull on the
dangling thread, where is the thread likely to break:
below the stone or above it? What if the person gives a
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FIGURE 4-36
Question 9.
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.
Chapter 4 Solutions
Physics
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