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Homework Help: Acceleration problem

  1. Apr 8, 2009 #1
    1. The problem statement, all variables and given/known data

    A wheel is spinning at 43rpm with its spin axis vertical. After 15s , it's spinning at 62rpm with its axis horizontal. Find (a) the magnitude of its average angular acceleration.

    2. Relevant equations

    [tex]\alpha[/tex] = [tex]\varpi[/tex] /t

    attempt :

    change in omega is 2pi/60 (62-43)
    t = 15
    so divide them to get rad/s/s
    1.3 * 10^-1
  2. jcsd
  3. Apr 8, 2009 #2


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    Homework Helper

    First of all find the angular momentum L.
    Then find the rate of change of angular momentum.
    Note that L is a vector.So when you find change in L, you have to use vector subtraction. Finally equate it to I*alpha.
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