The speed of the brake drum shown is controlled by a belt attached to the control bar AD. A force P with a magnitude of 25 lb is applied to the control bar at A. Determine the magnitude of the couple being applied to the drum knowing that the coefficient of kinetic friction between the belt and the drum is 0.25, that a = 4 in., and that the drum is rotating at a constant speed (a) counterclockwise, (b) clockwise.
The speed of the brake drum shown is controlled by a belt attached to the control bar AD. A force P with a magnitude of 25 lb is applied to the control bar at A. Determine the magnitude of the couple being applied to the drum knowing that the coefficient of kinetic friction between the belt and the drum is 0.25, that a = 4 in., and that the drum is rotating at a constant speed (a) counterclockwise, (b) clockwise.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A
P
-24 in.
B
r = 8 in.
C
E
D
Fig. P8.115, P8.116, and P8.117
Transcribed Image Text:8.115 The speed of the brake drum shown is controlled by a belt attached
to the control bar AD. A force P with a magnitude of 25 lb is applied
to the control bar at A. Determine the magnitude of the couple being
applied to the drum knowing that the coefficient of kinetic friction
between the belt and the drum is 0.25, that a = 4 in., and that the drum
is rotating at a constant speed (a) counterclockwise, (b) clockwise.
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