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Homework Help: Circular Decceleration

  1. Jul 9, 2005 #1
    Problem:

    The turntable of a record player rotates at a rate of 50.7 rev/min and takes 92.7s to come to rest when switched off.

    Calculate the magnitude of its angular acceleration. Answer in units of rad/s^2.

    Solution:

    First I converted rev/min to rad/s. Which I got to be 5.309 rad/sec. Then I found the constant average decceleration which would be the decceleration because it is a constant decceleration.

    A(avg)
    =
    The Change in Velocity
    ---------------------
    The Change in Time

    My soultion, which is wrong, is -.0573. What am I doing wrong?
     
    Last edited: Jul 9, 2005
  2. jcsd
  3. Jul 9, 2005 #2
    Ha!

    Well, it was asking for the magnitude... so the solution was .0573 not -.0573.
     
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