A flexible belt placed around a rotating drum of 4-inch radius acts as a brake when the arm ABCD is pulled down by the force P. The coefficient of kinetic friction between the belt and the drum is 0.2. Determine the force P that would result in a braking torque of 400-lb : in., assuming that counterclockwise. Neglect the weight of the brake arm. the drum is rotating

International Edition---engineering Mechanics: Statics, 4th Edition
4th Edition
ISBN:9781305501607
Author:Andrew Pytel And Jaan Kiusalaas
Publisher:Andrew Pytel And Jaan Kiusalaas
Chapter7: Dry Friction
Section: Chapter Questions
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3. A flexible belt placed around a rotating drum of 4-inch radius acts
as a brake when the arm ABCD is pulled down by the force P. The
coefficient of kinetic friction between the belt and the drum is
0.2. Determine the force P that would result in a braking torque
that
of
in.,
the
is
assuming
counterclockwise. Neglect the weight of the brake arm.
400-lb.
drum
rotating
60
60
D.
B
-2 in.
4 in.
2 in.-
Transcribed Image Text:3. A flexible belt placed around a rotating drum of 4-inch radius acts as a brake when the arm ABCD is pulled down by the force P. The coefficient of kinetic friction between the belt and the drum is 0.2. Determine the force P that would result in a braking torque that of in., the is assuming counterclockwise. Neglect the weight of the brake arm. 400-lb. drum rotating 60 60 D. B -2 in. 4 in. 2 in.-
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