The lightweight wheel on a road bike has a moment of inertia of 0. 097 kg⋅m2. A mechanic, checking the alignment of the wheel, gives it a quick spin; it completes 5 rotations in 2. 4 s. To bring the wheel to rest, the mechanic gently applies the disk brakes, which squeeze pads against a metal disk connected to the wheel. The pads touch the disk 7. 1 cm from the axle, and the wheel slows down and stops in 1. 4 s.
What is the magnitude of the friction force on the disk?
