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Homework Help: The Equations of Rotational Kinematics

  1. Oct 13, 2008 #1
    1. A spinning wheel on a fireworks display is initially rotating in a counterclockwise direction. The wheel has an angular acceleration of -4.00rad/s2. Because of this acceleration, the angular velocity of the wheel changes from its initial value to a final value of -25.0rad/s. While this change occurs, the angular displacement of the wheel is zero. Find the time required for the change in the angular velocity to occur.

    2. W=Wo+xt

    3. The answer is suppose to be 12.5s..
    OK the initial velocity is what I don't have, i know that its going to be negative.. In order for me to get the Initial angular velocity, i need the Time, which I also don't have.. I don't know how to answer with two unknowns.
  2. jcsd
  3. Oct 13, 2008 #2
    hello lol
  4. Oct 14, 2008 #3
    bump bump bump
  5. Oct 14, 2008 #4
    bumping again for the 2nd day :)
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