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"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? "
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"a grindstone of radius 4.0 m is initially spinning with an angular speed of 8.0 rad/s. the angular...
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