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10–83.
Solve Prob. 10–75 using Mohr’s circle.
998
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•10–85.
Solve Prob. 10–79 using Mohr’s circle.
1000
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10–86.
Solve Prob. 10–80 using Mohr’s circle.
1001
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10–87.
Solve Prob. 10–81 using Mohr’s circle.
1002
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10–90. Determine the mass moment of inertia Ix of the
right circular cone and express the result in terms of the
total mass m of the cone. The cone has a constant density r.
y
y ⫽ –hr x
r
x
h
1005
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z
10–94. Determine the mass moment of inertia Iy of the
solid formed by revolving the shaded area around the y axis.
The density of the material is r. Express the result in terms
of the mass m of the semi-ellipsoid.
a
2
z2 ⫽ 1
y ⫹ ––
––
2
a
b2
b
y
x
1009
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8–6. The 180-lb man climbs up the ladder and stops at the
position shown after he senses that the ladder is on the verge
of slipping. Determine the coefficient of static friction between
the friction pad at A and ground if the inclination of the ladder
is u = 60° and the wall at B is smooth.The center of gravity for
the man is at G. Neglect the weight of the ladder.
B
G 10 ft
u
3 ft
688
A
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8–10. The uniform 20-lb ladder rests on the rough floor
for which the coefficient of static friction is ms = 0.8 and
against the smooth wall at B. Determine the horizontal
force P the man must exert on the ladder in order to cause
it to move.
B
5 ft
8 ft
P
5 ft
A
6 ft
692