Problem 4. (25 points)

The thin disk below turns on a massless arm B by way of a smooth bearing that keeps the axes

of D and B aligned. The arm is hinged to the shaft driven at a constant angular speed 2 by a

motor. The system is set up so that the arm is horizontal when the disk contacts the ground as

shown. Assuming the disk of mass m rolls without slipping, find the force reactions and the moment

reactions exerted by the arm on the bearings at point C in terms of the given dimensions, the mass,

the normal force acting on the disk, the friction forces acting on the disk and the angular speed .

FRAME F

YA

X

ク

도

FROME I