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PROBLEM 16.27
The 8-in.-radius brake drum is attached to a larger flywheel that is not
shown. The total mass moment of inertia of the drum and the flywheel is
2
14 lb ft s⋅⋅
and the coefficient of kinetic friction between the drum and
the brake shoe is 0.35. Knowing that the angular velocity of the flywheel
is 360 rpm counterclockwise when a force P of magnitude 75 lb is
applied to the pedal C, determine the number of revolutions executed by
the flywheel before it comes to rest.
PROBLEM 16.28
Solve Problem 16.27, assuming that the initial angular velocity of the
flywheel is 360 rpm clockwise.
PROBLEM 16.27 The 8-in.-radius brake drum is attached to a larger
flywheel that is not shown. The total mass moment of inertia of the drum
and the flywheel is
2
14 lb ft s⋅⋅
and the coefficient of kinetic friction
between the drum and the brake shoe is 0.35. Knowing that the angular
velocity of the flywheel is 360 rpm counterclockwise when a force P of
magnitude 75 lb is applied to the pedal C, determine the number of
revolutions executed by the flywheel before it comes to rest.
PROBLEM 16.29
The 100-mm-radius brake drum is attached to a flywheel which is not
shown. The drum and flywheel together have a mass of 300 kg and a
radius of gyration of 600 mm. The coefficient of kinetic friction between
the brake band and the drum is 0.30. Knowing that a force P of magnitude
50 N is applied at A when the angular velocity is 180 rpm counterclockwise,
determine the time required to stop the flywheel when a = 200 mm and
b = 160 mm.
PROBLEM 16.29 (Continued)
PROBLEM 16.30
The 180-mm radius disk is at rest when it is placed in contact with a belt
moving at a constant speed. Neglecting the weight of the link AB and
knowing that the coefficient of kinetic friction between the disk and the
belt is 0.40, determine the angular acceleration of the disk while slipping
occurs.
PROBLEM 16.30 (Continued)
PROBLEM 16.31
Solve Problem 16.30, assuming that the direction of motion of the belt is
reversed.
PROBLEM 16.30 The 180-mm disk is at rest when it is placed in contact
with a belt moving at a constant speed. Neglecting the weight of the link
AB and knowing that the coefficient of kinetic friction between the disk
and the belt is 0.40, determine the angular acceleration of the disk while
slipping occurs.
PROBLEM 16.32
In order to determine the mass moment of inertia of a flywheel of radius
600 mm, a 12-kg block is attached to a wire that is wrapped around the
flywheel. The block is released and is observed to fall 3 m in 4.6 s. To
eliminate bearing friction from the computation, a second block of mass 24 kg
is used and is observed to fall 3 m in 3.1 s. Assuming that the moment of the
couple due to friction remains constant, determine the mass moment of inertia
of the flywheel.
PROBLEM 16.32 (Continued)
PROBLEM 16.33
The flywheel shown has a radius of 20 in. a weight of 250 lbs, and a radius of
gyration of 15 in. A 30-lb block A is attached to a wire that is wrapped around
the flywheel, and the system is released from rest. Neglecting the effect of
friction, determine (a) the acceleration of block A, (b) the speed of block A after
it has moved 5 ft.
