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Finding tangential acceleration of a rotating disk

  1. Aug 8, 2017 #1
    1. The problem statement, all variables and given/known data
    Attached.

    2. Relevant equations
    Tangenital acceleration=r*alpha

    3. The attempt at a solution

    I thought it was just simply r*alpha=2*20=40 (choice A), but the answer key says choice B. I'm not really sure where I could have went wrong or its possible that there is a mistake in the answer key. P Q.png Any insight would be very helpful. Thanks.
     
  2. jcsd
  3. Aug 8, 2017 #2

    BvU

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    Stick to answer A. Key's wrong.
     
  4. Aug 8, 2017 #3

    CWatters

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  5. Aug 8, 2017 #4
    Thanks.
     
  6. Aug 8, 2017 #5

    scottdave

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    I calculate 79 m/s² for the centripetal acceleration (towards the center).
     
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