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Homework Help: Angular acceleration

  1. Dec 3, 2008 #1
    1. The problem statement, all variables and given/known data
    wheel rotates w constant acceleration 3.65rad/s2
    angular speed is 3.00 rad/s at t=0
    a)what angle does wheel rotate between t=0 and t=3.67s?
    b)what is angular speed of wheel at 4.1s?


    2. Relevant equations
    wt+1/2alphat
    (3.00rad/s)(3.67t)+1/2(3.65rad/s2)(3.67)2=17.70rad
    17.70rad*360degrees/628rad=1014.65degrees

    w=w0+alpha t
    3.00rad/s+3.65rad/s2(4.1s)=17.97rad/s

    3. The attempt at a solution
    a=1014.65 degrees
    b=17.97rad/s
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



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

    alphysicist

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    Homework Helper

    Hi dr2112,

    I don't believe this is correct. The final t needs to be squared:

    [tex]
    \Delta\theta = \omega_0 t + \frac{1}{2}\alpha t^2
    [/tex]
     
  4. Dec 14, 2008 #3
    Ok how is 1.60 m/s^2 for tangential and 8.61 m/s^2 for total acceleration?
     
  5. Dec 15, 2008 #4

    alphysicist

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    Homework Helper

    Is this for a different problem, or is there more to the problem in your first post?
     
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