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Homework Help: Angular Acceleration Question

  1. Nov 12, 2008 #1
    1. The problem statement, all variables and given/known data

    A wheel is spinning at 800 rad/s. A torque is applied to the wheel until it stops spinning 14 seconds later. What is the angular acceleration, and how many revolutions did it go through?

    v=800 read/s
    t=14 s

    2. Relevant equations

    angular acceleration = delta w / delta t
    1 revolution = 360 degrees = 2 pi rad

    3. The attempt at a solution

    delta w/delta t = 800/14 = 57.1 rads/s2

    57.1 / 2 pi = 9.09 revolutions
  2. jcsd
  3. Nov 13, 2008 #2


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    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi badula ! Welcome to PF! :smile:

    (have a pi: π and a delta: ∆ and an omega: ω :wink:)
    Hint: you can use the usual linear equations of motion for uniform acceleration …

    it's just like a linear speed of 800 m/s, stopping after 14 s, but with rad instead of m. :wink:
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