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Homework Help: How to find angular acceleration

  1. Nov 16, 2008 #1
    1. The problem statement, all variables and given/known data
    A propeller slows from 450 rev/min to 200 rev/min in 3.50 s. What is its angular acceleration?

    2. Relevant equations
    ac = v^2/r
    and v = rw

    3. The attempt at a solution
    I know this is probably a simple problem, but what do the variables in the relevant equations refer to?
  2. jcsd
  3. Nov 16, 2008 #2
    Here are some more relevant equations:

    [tex]\frac{1 rev}{min}=\frac{1 rev}{60 s}=\frac{\pi rad}{30 s}[/tex], and
    [tex]\vec{\alpha}_{ave}=\frac{\Delta\vec{\omega}}{\Delta t}[/tex].
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