A Grindstone of Radius 4

question 10

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 magnitude of the angular acceleration of the grindstone?

• A)0.50 rad/s²
• B)1.0 rad/s²
• C)4.5 rad/s²
• D)9.0 rad/s²
• E)18 rad/s²

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