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Angular velocity of bicycle wheel

  1. Apr 29, 2015 #1
    1. The problem statement, all variables and given/known data
    A bicycle rider is moving with a velocity of 13.0 m/s. What is the angular velocity of his wheels if they have a diameter of 0.660m? Assume the wheels are rolling without slipping.

    a) 39.4 m/s
    b) 19.7 m/s
    c) 39.4 s-1
    d) 4.29 s-1
    e) none of the above

    2. Relevant equations
    v = ω r

    3. The attempt at a solution
    ω = v/r
    ω = (13m/s) / (0.330m) = 39.4 s-1
    This problem was given on a test, I put "c" and got it wrong. It seems very straightforward and I'm not sure where I went wrong. Is there a mistake in my work? Im thinking it was most likely a mistake with the grading machine but I just wanted someone to confirm before I talked to the teacher. Thanks.
     
  2. jcsd
  3. Apr 29, 2015 #2

    phyzguy

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    Your answer looks correct to me.
     
  4. Apr 29, 2015 #3

    haruspex

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    Yes, your answer is definitely correct. Note that you almost don't need the question. Just looking at the choice of answers, and assuming each wrong answer corresponds to a single likely error, (c) stands out as the common theme.
     
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