Physics
7th Edition
ISBN: 9780321733627
Author: Douglas C. Giancoli
Publisher: PEARSON
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Chapter 4, Problem 20P
A box weighing 77.0 N rests on a table. A rope tied to the box runs vertically upward over a pulley and a weight is hung from the other end (Fig. 4-45). Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley weighs (a) 30.0 N, (b) 60.0 N, and (c) 90.0 N.
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ODI
48. (II) A small box is held in place against a rough vertical
wall by someone pushing on it with a force directed upward
at 28° above the horizontal. The coefficients of static and
kinetic friction between the box and wall are 0.40 and
0.30, respectively. The box slides down unless the applied
force has magnitude 23 N. What is the mass of the box?
49. (II) Two crates, of mass 65 kg and 125 kg, are in contact and
at rest on a horizontal surface (Fig. 4-57). A 650-N force
is exerted on the 65-kg crate. If the coefficient of kinetic
friction is 0.18, calculate (a) the acceleration of the sys-
tem, and (b) the force that each crate exerts on the other.
(c) Repeat with the crates reversed.
650 N
65 kg 125 kg
FIGURE 4-57
Problem 49.
50. (II) A person pushes a 14.0-kg lawn mower at constant
speed with a force of F = 88.0 N directed along the handle,
which is at an angle of 45.0° to the horizontal (Fig. 4-58).
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A 12-kg crate rests on a horizontal surface and a boy pushing it with a force that is 30° below
the horizontal. If the coefficient of static friction is 0.4, the minimum magnitude force he
needs to start the crate moving (in N) is ? g = 10 m/s2
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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.
Chapter 4 Solutions
Physics
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Problem 21.
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