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No slip wheel, distance covered, find revolutions

  1. Oct 21, 2011 #1
    The radius of each wheel on a bicycle is 0.400 m. The bicycle travels a distance of 3.0 km. Assuming that the wheels do not slip, how many revolutions does each wheel make?

    This problem seems so simple but none of the possible answers available seems correct.

    My work

    r = 0.4 m
    x = 3 km = 3000 m

    # of revolutions = x / [(2)(Pi)(r)] = 3000 / (2 x 3.14 x 0.4) ~119.4 m?

    -------------------------
    Below are the answers to choose from

    8.4 × 10-4 revolutions


    1.2 × 103 revolutions


    Since the time of travel is not given, there is not enough information for a solution.


    6.0 × 103 revolutions


    2.4 × 102 revolutions
     
  2. jcsd
  3. Oct 21, 2011 #2

    gneill

    User Avatar

    Staff: Mentor

    I think you slipped a decimal place in your calculation. Also, revolutions are not measured in units of meters.
     
  4. Oct 21, 2011 #3
    that is the weirdest thing. i think i calculated that about 4 times before getting frustrated and posting here. thank you so much!
     
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