Physics

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?

  1. 2
asked by Anonymous
  1. circumference = 2 pi R


    time in seconds
    = distance / speed = 2 pi (1.3) /14.7

    posted by Damon
  2. Ohhhhhhh...
    so we use the CIRCUMFERENCE, not the RADIUS. Got it. Thank you so much!

    posted by Anonymous
  3. Yes, unless it makes a wild plunge for the center of the circle :)

    posted by Damon

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