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**1. Homework Statement**

A disk with a radial line painted on it is mounted on an axle perpendicular to it and running through its center. It is initially at rest, with the line at theta 0 = -90°. The disk then undergoes constant angular acceleration. After accelerating for 3.1 s, the reference line has been moved part way around the circle (in a counterclockwise direction) to theta f = 130°.

Given this information, what is the angular speed of the disk after it has traveled one complete revolution (when it returns to its original position at -90°)?

**2. Homework Equations**

w = lim(change in theda)/(change in time)

**3. The Attempt at a Solution**

change in theda is 140 degrees

change in time is 3.1 seconds