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posted by  tomanj on 11/6/2009 7:48:24 PM  |  status: Closed  |  Earned Karma: 45

Rotational Kinematics

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N/A N/A N/A N/A 11/9/2009 at 10:00:00 AM
Question Details:
8. An automatic drier spins wet clothes at an angular speed of 5.2 rad/s. Starting from rest, the drier reaches it's operating speed with an average angular acceleration of 4.0 rad/s2. How long does it take the drier to come up too speed?
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posted by Roger Bravo(MND) on 11/6/2009 7:55:50 PM  |  status: Live
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Response Details:
   First equation for angular motion is
   ω   =   ω0   +   α * t
   ω   =   final angular speed   =   5.2   rad/s,   ω0   =   initial angular speed   =   0,  
    α   =   angular acceleration   =   4.00 rad/s2
   =>   5.2   =   0   +   4.0 * t
   time   t   =   5.2 / 4.0   =   1.30   s
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