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Could someone help me solve this problem?

  1. Oct 19, 2014 #1
    Your roommate is working on his bicycle and has the bike upside down. He spins the 60-cm-diameter wheel, and you notice that a pebble stuck in the tread goes by four times every second. What is the centripetal force? i know the speed is 7.5 m/s and the equation is a=v^2/r but it keeps on giving me the incorrect answer of 1.875. Help!!
  2. jcsd
  3. Oct 19, 2014 #2
    I mean acceleration my b
  4. Oct 19, 2014 #3
    Please do not post those sorts of questions in this forum. This section is for introductions only. :)
  5. Oct 19, 2014 #4


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    Staff: Mentor

    melopelo, please post your homework in the proper homework section.

    Thank you.
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