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Radians question

  1. Mar 26, 2015 #1
    1. The problem statement, all variables and given/known data
    upload_2015-3-26_21-30-49.png

    2. Relevant equations


    3. The attempt at a solution
    So, I got the answer to be 126 radians BUT my answer was wrong because it was suppose to be NEGATIVE 126 radians. Can someone explain why my answer was suppose to be negative?
     
  2. jcsd
  3. Mar 27, 2015 #2

    haruspex

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    The wagon is moving in the +x direction. Which way will the wheels rotate? What is the usual convention for the sign of a rotation in planar co-ordinates?

    (That said, I think it could me made clearer that a signed value is wanted, not just a magnitude.)
     
  4. Mar 27, 2015 #3
    wheels will rotate clockwise.
     
  5. Mar 27, 2015 #4

    haruspex

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    Yes, and what is usually taken as the positive direction for a rotation in the plane?
     
  6. Mar 27, 2015 #5
    I thought it didn't matter which direction you set to be positive or negative.
     
  7. Mar 27, 2015 #6

    haruspex

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    The standard convention, e.g. in polar co-ordinates, is anticlockwise positive.
     
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