The radius of the 2-kg disk is R = 80 mm. Its moment of inertia is I = 0.0064 kg-m2. What...

The radius of the 2-kg disk is R = 80 mm. Its moment of inertia is I = 0.0064 kg-m2. What minimum coefficient of static friction is necessary for the disk to roll, instead of slip, on the inclined surface? (See Active Example 18.2.)