Determine the angular momentum of rod AB in Prob. 21-22 about its mass center at the ins...

Determine the angular momentum of rod AB in Prob. 21-22 about its mass center at the instant shown. Assume the angular velocity of the rod is directed perpendicular to the axis of the rod.

Prob. 21-22:

The 4-lb rod AB is attached to the disk and collar using ball-and-socket joints. If the disk has a constant angular velocity of 2 rad/s, determine the kinetic energy of the rod when it is in the position shown. Assume the angular velocity of the rod is directed perpendicular to the axis of the rod.