Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 4, Problem 7P
To determine
The magnitude of horizontal force exerted on the boat.
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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.
Three mountain climbers who are roped together in a line
are ascending an icefield inclined at 31.0° to the horizontal
(Fig. 4-69). The last climber slips, pulling the second
climber off his feet. The first climber is able to hold them
both. If each climber has a mass of 75 kg, calculate the ten-
sion in each of the two sections of rope between the three
climbers. Ignore friction between the ice and the fallen
climbers.
31.0°
FIGURE 4-69 Problem 83.
3-39. A "scale" is constructed with a 4-ft-long cord and the 10-lb block D. The cord is fixed to a pin at A and passes over two small pulleys. Determine the weight of the suspended block B if the system is in equilibrium when s=1.5 ft
Chapter 4 Solutions
Physics Fundamentals
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