A uniform, hollow, cylindrical spool has inside radius
Chapter 10, Problem 94(choose chapter or problem)
A uniform, hollow, cylindrical spool has inside radius R/2, outside radius R, and mass M (Fig. P10.94). It is mounted so that it rotates on a fixed, horizontal axle. A counterweight of mass m is connected to the end of a string wound around the spool. The counterweight falls from rest at t 5 0 to a position y at time t. Show that the torque due to the friction forces between spool and axle is tf 5 Rcmag 2 2y t 2 b 2 M 5y 4t 2 d
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