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Physic tangential and Angular Acceleration need help

  1. Sep 27, 2008 #1
    1. The problem statement, all variables and given/known data
    In a Beams ultracentrifuge, a 20.3 cm long rotor is suspended magnetically in a vacuum. Since there is no mechanical connection to the rotor, the only friction is the air resistance due to the few air molecules in the vacuum. If the rotor is spinning with an angular speed of 4.9 105 rad/s and the driving force is turned off, its spinning slows down at an angular rate of 0.39 rad/s2.

    (a) For a point at the end of the rotor, find the initial speed.
    105 m/s
    (b) For a point at the end of the rotor, find the tangential acceleration component.
    m/s2
    (c) For a point at the end of the rotor, find the maximum radial acceleration component.
    m/s2
    I could not figure out a and c please help

    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Sep 28, 2008 #2

    cristo

    User Avatar
    Staff Emeritus
    Science Advisor

    How did you calculate (a)?

    What equations do you know involving acceleration?
     
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