A Grindstone of Radius 4

question 4

Multiple Choice

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

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