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PROBLEM 15.104
Using the method of section 15.3, solve Problem 15.38.
PROBLEM 15.38 An automobile travels to the right at a
constant speed of 48 mi/h. If the diameter of a wheel is 22 in.,
determine the velocities of Points B, C, D, and E on the rim of
the wheel.
PROBLEM 15.105
A 5-m steel beam is lowered by means of two cables
unwinding at the same speed from overhead cranes. As the
beam approaches the ground, the crane operators apply brakes
to slow the unwinding motion. At the instant considered the
deceleration of the cable attached at B is
2
2.5 m/s ,
while that
of the cable attached at D is
2
1.5 m/s .
Determine (a) the
angular acceleration of the beam, (b) the acceleration of points
A and E.
PROBLEM 15.106
For a 5-m steel beam AE the acceleration of point A is
2
2 m/s
downward and the angular acceleration of the beam is
2
1.2 rad/s
counterclockwise. Knowing that at the instant
considered the angular velocity of the beam is zero, determine
the acceleration (a) of cable B, (b) of cable D.
PROBLEM 15.107
A 900-mm rod rests on a horizontal table. A force P applied as
shown produces the following accelerations:
2
3.6 m/s
A=a
to
the right,
2
6 rad/s
α
=
counterclockwise as viewed from above.
Determine the acceleration (a) of Point G, (b) of Point B.
PROBLEM 15.108
In Problem 15.107, determine the point of the rod that (a) has
no acceleration, (b) has an acceleration of
2
2.4 m/s
to the right.
PROBLEM 15.109
Knowing that at the instant shown crank BC has a constant angular
velocity of 45 rpm clockwise, determine the acceleration (a) of Point A,
(b) of Point D.
PROBLEM 15.109 (Continued)
PROBLEM 15.110
End A of rod AB moves to the right with a constant velocity of 6 ft/s. For the
position shown, determine (a) the angular acceleration of rod AB, (b) the
acceleration of the midpoint G of rod AB.
PROBLEM 15.110 (Continued)
PROBLEM 15.111
An automobile travels to the left at a constant speed of 72 km/h.
Knowing that the diameter of the wheel is 560 mm, determine
the acceleration (a) of Point B, (b) of Point C, (c) of Point D.
