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Homework Help: Simple rotational motion point problem

  1. Dec 2, 2011 #1
    Two points are on a disk that rotates about an axis perpendicular to the plane of the disk at its center. Point B is 2.00 times as far from the axis as point A.

    If the linear speed of point is V, then the linear speed of point A is

    I know the speed of A must be less and i think its V/4. Is this right?
  2. jcsd
  3. Dec 2, 2011 #2


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    Science Advisor

    Yes, it is slower, no, it not V/4.

    Suppose the distance from the center of the disk to point A is R so the distance from the center to point B is 2R. How far does each travel in one rotation? Remember that the both complete one rotation in the same time.
  4. Dec 2, 2011 #3
    ok. i think its V/2?
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