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Homework Help: Angular acceleration in revs/s^2

  1. Apr 18, 2009 #1
    http://img15.imageshack.us/img15/858/masteringf.jpg [Broken]

    my attempt,

    [tex]\alpha[/tex]= dw/dt

    550-150 = 400 rev/min change

    400/3.5 = 114 revs

    that wasn't right so i tried
    114*60, which gives -6857 revs^-2

    can someone help please? i'm not sure if i've got this whole revolution thing correct in my head lol
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Apr 18, 2009 #2


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    550-150 = 400 rev/min change
    Convert rev/min to rev/s
  4. Apr 18, 2009 #3
    why does angular acceleration come out right whether you use Angular velocity or revolutions?

    [tex]\alpha[/tex] = w/t

    [tex]\alpha[/tex] = revolutions/t
  5. Apr 18, 2009 #4


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    You can express angular velocity either in rev/min or rad/s.
    In the problem α should be rev/s^2. So you have to convert rev/min to rev/s.
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