A uniform disk turns at 3.3 rev/s around a frictionless central axis. A nonrotating rod, of the

Question:

A uniform disk turns at 3.3 rev/s around a frictionless central axis. A nonrotating rod, of the same mass as the disk and length equal to the disk's diameter, is dropped onto the freely spinning disk, Fig. 8-56. They then turn together around the axis with their centers superposed. What is the angular frequency in rev/s of the combination?