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PROBLEM 8.8
Considering only values of
less than 90, determine the smallest value of
required to start the block moving to the right when (a) 75 lb,W
(b) 100 lb.W
PROBLEM 8.9
Knowing that θ = 40°, determine the smallest force
P
for which equilibrium of the
7.5-kg block is maintained.
PROBLEM 8.10
Knowing that P = 100 N, determine the range of values of θ for which equilibrium
of the 7.5-kg block is maintained.
PROBLEM 8.10 (Continued)
100 N 73.575 N
sin
sin 114.23
s
Copyright © McGraw-Hill Education. Permission required for reproduction or display.
PROBLEM 8.11
The 50-lb block A and the 25-lb block B are supported by an incline
that is held in the position shown. Knowing that the coefficient of
static friction is 0.15 between the two blocks and zero between block
B and the incline, determine the value of
for which motion is
impending.
Copyright © McGraw-Hill Education. Permission required for reproduction or display.
PROBLEM 8.12
The 50-lb block A and the 25-lb block B are supported by an incline
that is held in the position shown. Knowing that the coefficient of
static friction is 0.15 between all surfaces of contact, determine the
value of
for which motion is impending.
PROBLEM 8.13
Three 4-kg packagesA, B, and C are placed on a conveyor belt that
is at rest. Between the belt and both packages A and C the
coefficients of friction are
0.30
s
and
0.20;
k
between
package B and the belt the coefficients are
0.10
s
and
0.08.
k
The packages are placed on the belt so that they are in contact with
each other and at rest. Determine which, if any, of the packages will
move and the friction force acting on each package.
PROBLEM 8.13 (Continued)
PROBLEM 8.14
Solve Problem 8.13 assuming that package B is placed to the right of
both packages A and C.
PROBLEM 8.13
Three 4-kg packagesA, B, and C are placed on a
conveyor belt that is at rest. Between the belt and both packages A
and C the coefficients of friction are
0.30
s
and
0.20;
k
between package B and the belt the coefficients are
0.10
s
and
0.08.
k
The packages are placed on the belt so that they are in
contact with each other and at rest. Determine which, if any, of the
packages will move and the friction force acting on each package.
PROBLEM 8.14 (Continued)
