Asked by Anonymous

A 0.45-kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.3-m on a frictionless horizontal surface.
If the maximum speed of the ball is 14.7 m/s, how long does it take the ball to make on rotation if it is moving at its maximum speed?
Answered by Damon
circumference = 2 pi R


time in seconds
= distance / speed = 2 pi (1.3) /14.7
Answered by Anonymous
Ohhhhhhh...
so we use the CIRCUMFERENCE, not the RADIUS. Got it. Thank you so much!
Answered by Damon
Yes, unless it makes a wild plunge for the center of the circle :)
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