A grindstone of radius 4.0 m is initially spinning with an angular speed of 8.0 rad/s. The angular speed is then increased to 12 rad/s over the next 4.0 seconds. Assume that the angular acceleration is constant.
-What is the average angular speed of the grindstone?
A)0.5 rad/s
B)2.0 rad/s
C)4.0 rad/s
D)8.0 rad/s
E)10 rad/s

Question

Quizplus · Accepted Answer

The average angular speed is the mean of the initial and final angular speeds: (8.0 rad/s + 12 rad/s) / 2 = 10 rad/s.

A Grindstone of Radius 4