The disk of a portable sander rotates at the constant rate 1 = 4400 rpm as shown.

The disk of a portable sander rotates at the constant rate ω1 = 4400 rpm as shown. Determine the angular acceleration of the disk as a worker rotates the sander about the z axis with an angular velocity of 0.5 rad/s and an angular acceleration of 2.5 rad/s2, both clockwise when viewed from the positive z axis.