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Homework Help: Non-uniform circular motion

  1. Oct 17, 2009 #1
    1. The problem statement, all variables and given/known data

    A spinning disk has an angular velocity (Va) of 2 rad/s and an angular acceleration (Aa) of 3 rad/s2. A point on the disk (x) is 1 m from the center of the disk. What is the magnitude of this point x's acceleration in m/s2?

    Is it the sum of the the tangential acceleration plus the centripetal acceleration?

    3. The attempt at a solution

    Using the angular acceleration and point x's radius I found it's acceleration to be 3 m/s^2

    Then, using Ac = V2 / r, I found the centripetal acceleration to be 4 m/s2.

    Now that I have these values do I add their scalar values or their vector values?
    Last edited: Oct 17, 2009
  2. jcsd
  3. Oct 17, 2009 #2


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    The two vectors are not in the same direction. So ........?
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