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Homework Help: How fast will the pebble be travelling with respect to the center of the wheel

  1. Feb 27, 2010 #1
    1. The problem statement, all variables and given/known data

    A 24.6 g pebble is stuck in the thread of a 28.7 in tire. If the tire can exert an inward radial friction force of up to 19.3 N on the pebble, how fast will the pebble be travelling with respect to the center of the wheel when it flies out tangentiall?

    2. Relevant equations

    a = v^2 / r

    3. The attempt at a solution

    I got:

    19.3 N = (m*v^2)/r => v^2 = (19.3 * r) / m = (19.3N * 0.36449 m) / 0.0246 kg = 16.9 m/s = final answer = INCORRECT ????

    This problem is supposed to be easy, but I dont know what I'm doing wrong here. Anyone?
     
  2. jcsd
  3. Feb 28, 2010 #2
    I can't see what's wrong with it.
     
  4. Feb 28, 2010 #3
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