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Homework Help: Rotational Kinematics of a disk

  1. Jan 31, 2008 #1
    1. The problem statement, all variables and given/known data

    A disk with a radial line painted on it is mounted on an axle perpendicular to it and running through its center. It is initially at rest, with the line at q0 = -90.0°. The disk then undergoes constant angular acceleration. After accelerating for 3.15 s, the reference line has been moved part way around the circle (in a counterclockwise direction) to qf = 130°.

    Given this information, what is the angular speed of the disk after it has traveled one complete revolution (when it returns to its original position at -90.0°)?

    2. Relevant equations

    http://www.ajdesigner.com/phpcircularmotion/centripetal_acceleration_equation.php

    3. The attempt at a solution

    Not sure I know have to use Rotational Kinematics to find the angular velocity first.
     
  2. jcsd
  3. Jan 31, 2008 #2

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    You have to use only the eqns of Rotational Kinematics, not dynamics.
     
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