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posted by  tomanj on 11/6/2009 7:51:58 PM  |  status: Closed  |  Earned Karma: 45

Rotational Kinematics 2

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9. An electric fan is running on HIGH. After the LOW button is pressed, the angular speed of the fan decreases to 83.8 rad/s in 1.75 s. The deceleration is 4.0 read/s2. Determine the intial angular speed of the fan.
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posted by Justin_08 on 11/6/2009 7:57:38 PM  |  status: Live
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Response Details:

   Given that the final angular velocity is ω2 = 83.8 rad/s
    time taken is t = 1.75s
    deceleration is α = - 4 rad/s2
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 From the equation of motion 
            α = ( ω2 - ω1 ) / t
          ω1 = ω2 - αt
               = 90.8 rad/s
 
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