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Homework Help: Angular Velocity of an arm

  1. May 20, 2010 #1
    1. The problem statement, all variables and given/known data
    Compute the angular velocity (ω) when the arm reaches 45 degrees

    equation = ω^2 = ωi^2 + 2α(Δθ)

    α = 196.85

    2. Relevant equations
    equation = ω^2 = ωi^2 + 2α(Δθ)

    3. The attempt at a solution

    2(196.85)(45) ??

    what do i use for ωi^2? or is it just 0
  2. jcsd
  3. May 21, 2010 #2


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    Homework Helper

    If they said it is at rest then use zero, if they said nothing, then I'd assume it to be at rest initially.
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