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A group of students observes that a wooden block (m = 0.40 kg) on the end of a string with a radius of 0.7 meters makes 9 rotations in 20.7 seconds when twirled.

a)What is the block's tangential (linear) speed?

b)What is the block's angular speed?

1 answer

a. v=2PIr/(9/20.7)

b. angular speed=v/r

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