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Homework Help: Rotational Kinematics

  1. Nov 13, 2004 #1
    Hi! I'm not sure where to start on this question and I would be very thankful if somebody could help me on it:

    At a mini golf course, a golf ball passes through a windmill. The windmill has 8 blades and rotates at an angular speed of 1.25 rad/s. The opening between successive blades is equal to the width of a blade. A golf ball of diameter 4.50 x 10^-2 m is just passing by one of the rotating blades. What must the minimum speed of the ball be so it won't be hit by the next blade?
  2. jcsd
  3. Nov 13, 2004 #2


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    Hint 1: How long does it take the golf ball to travel 4.5 cm at a given speed?

    Hint 2: How long is the opening available for the ball to pass through?
  4. Nov 13, 2004 #3
  5. Nov 13, 2004 #4
    Thank you guys for trying to help me! Now I'm gonna attempt to do it. :D
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