(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?

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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).
the bed
of abou
56. (II) A
erates c
impedi
friction
57. (II) Th
m
FIGURE 4-5
Problems 57
58. (II) A b
plane sh
go? (b)
Transcribed Image Text: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). the bed of abou 56. (II) A erates c impedi friction 57. (II) Th m FIGURE 4-5 Problems 57 58. (II) A b plane sh go? (b)
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