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Angular velocity help

  1. Oct 24, 2005 #1
    angular velocity help!!!!!!!

    Hi, I need help with the following 2 questions. My answers have *********
    next to them. Any help is appreciated. Thank you.



    1. A disk is rotating at a constant rate about a vertical axis through its center. Point Q is twice as far from the center of the disk as point P is. The angular velocity of Q at a given time is
    Choices:
    a) twice as big as P's
    b) the same as P's *******************
    c) half as big as P's
    d) none of the above

    i belive it's the same as P's, since and poing on radius r, has the same velocity on any point on the radius line.

    2. When a disk rotates counterclockwise at a constant rate about a vertical axis through its center, the tangential acceleration of a point on the rim is
    Choices:
    a) positive.
    b) zero. *******************
    c) negative.
    d) impossible to determine without more information.

    i belive it's zero, since it's rotating at a constant rate, which means the acceleration is zero.

    Any help is appreciated. Thank you.
     
    Last edited: Oct 24, 2005
  2. jcsd
  3. Oct 24, 2005 #2

    Tom Mattson

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    Staff Emeritus
    Science Advisor
    Gold Member

    According to the PF Global Guidelines (to which you agreed), you have to show your work before you can receive help.
     
  4. Oct 24, 2005 #3
    work is show to my answers.
     
  5. Oct 25, 2005 #4
    anyone????????
     
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