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Homework Help: Rotational Kinematics

  1. Nov 15, 2009 #1
    A solid ball with a diameter of 22 cm rolls along a horizontal surface as shown without slipping at a constant acceleration. It initially (t=0) has an angular velocity of 11 rad/s and 10 seconds later has an angular velocity of 3 rad/s.
    (a)What is its angular acceleration? rad/s2
    (b)What is the linear (translational) displacement of the ball? m
    (c)How long (from t=0) will it take to stop? sec

    I got -.8 rad/s^2
    15.4 m
    and 13.75 seconds

    Im so confused, can someone help me please????
  2. jcsd
  3. Nov 16, 2009 #2


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    Welcome to PF!

    Hi BlakeEdwards! Welcome to PF! :smile:

    (try using the X2 tag just above the Reply box :wink:)

    erm :redface: … you've used diameter instead of radius. :wink:
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