A stationary bicycle is raised off the ground, and its front
wheel (m = 1.3 kg) is rotating at an angular velocity of 13.7 rad/s
(see the drawing). The front brake is then applied for 3.0 s, and
the wheel slows down to 4.1 rad/s. Assume that all the mass of the
wheel is concentrated in the rim, the radius of which is 0.34 m.
The coefficient of kinetic friction between each brake pad and the
rim is μk = 0.85. What is the magnitude of the normal force that
each brake pad applies to the rim?