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PROBLEM 11.52 (Continued)
PROBLEM 11.53
A farmer wants to get his hay bales into the top loft of
his barn by walking his horse forward with a constant
velocity of 1 ft/s. Determine the velocity and
acceleration of the hay bale when the horse is 10 ft
away from the barn.
PROBLEM 11.54
The motor M reels in the cable at a constant rate of 100 mm/s. Determine
(a) the velocity of load L, (b) the velocity of pulley B with respect to load L.
PROBLEM 11.55
Collar A starts from rest at t = 0 and moves upward with a constant acceleration of
3.6 in./s2. Knowing that collar B moves downward with a constant velocity of 18 in./s,
determine (a) the time at which the velocity of block C is zero, (b) the corresponding
position of block C.
PROBLEM 11.56
Block A starts from rest at t 0 and moves downward with a constant acceleration
of 6 in./s
2
. Knowing that block B moves up with a constant velocity of 3 in./s,
determine (a) the time when the velocity of block C is zero, (b) the corresponding
position of block C.
PROBLEM 11.57
Block B starts from rest, block A moves with a constant
acceleration, and slider block C moves to the right with a
constant acceleration of
2
75 mm/s .
Knowing that at
2 st
the
velocities of B and C are 480 mm/s downward and 280 mm/s to
the right, respectively, determine (a) the accelerations of A and
B, (b) the initial velocities of A and C, (c) the change in position
of slider block C after 3 s.
PROBLEM 11.57 (Continued)
PROBLEM 11.58
Block B moves downward with a constant velocity of 20 mm/s.
At
0,t
block A is moving upward with a constant acceleration,
and its velocity is 30 mm/s. Knowing that at
3 st
slider block
C has moved 57 mm to the right, determine (a) the velocity of
slider block C at
0,t
(b) the accelerations of A and C, (c) the
change in position of block A after 5 s.
PROBLEM 11.58 (Continued)
PROBLEM 11.59
The system shown starts from rest, and each component moves with a constant
acceleration. If the relative acceleration of block C with respect to collar B is 60
2
mm/s
upward and the relative acceleration of block D with respect to block A is
2
110 mm/s
downward, determine (a) the velocity of block C after 3 s, (b) the
change in position of block D after 5 s.
