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Non uniform circular motion of a disc

  1. Oct 11, 2009 #1
    1. The problem statement, all variables and given/known data
    When powered up, a disk drive starts at rest and spins up with non-uniform acceleration. this lasts for 1.66 seconds after which it does not accelerate any more. how fast is it spinning at .87 seconds?
    alpha(i)=605 rad/s^2
    B=1.89
    Radius=2.03 cm


    2. Relevant equations

    alpha=alpha(i)sin(Bt)

    3. The attempt at a solution

    i don't know how to relate the tangential acceleration into my velocity. I know that At^2=Ar^2+At^2 and At^2=v^2/r, but i can't finish this. please help!
     
  2. jcsd
  3. Oct 11, 2009 #2

    Astronuc

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    Staff: Mentor

  4. Oct 11, 2009 #3
    so if i understand you correctly, i just need to integrate to achieve my answer?
     
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