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Homework Statement
The area of the piston in the master cylinder is 1.8cm^2, and that of the piston in the brake cylinder is 6.4cm^2. The coefficient of friction between shoe and wheel drum is .50. If the wheel has a radius of 34cm, determine the frictional torque about the axle when a force of 44N is exerted on the brake pedal.
(Pedal)--[master cylinder]-----[brake cylinder]-----(shoe)Wheel drum
Homework Equations
torque=rF
F1=(A1/A2)F2
F=(mu)*normal force
1.8cm^2=1.8X10^-4m^2
6.4cm^2=6.4X10^-4m^2
radius=34cm=.34m
The Attempt at a Solution
I solved for F2 and got 12.4N. Is this the force that the shoe exerts on the wheel drum?
If that is correct, how do i go about solving for the torque?
thank you