The disk weighs 32 lb and has a radius of gyration of 9 in R

The disk weighs 32 lb and has a radius of gyration of 9 in. Rod AB weighs 8 lb and the collar at A has a negligible weight.

In the position shown, it has an angular velocity of 60 rpm clockwise.

Determine the angular velocity of the disk (in rpm), when Point B is directly below Point C. (Enter only number, no unit.)