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Homework Help: Centripetal force

  1. Nov 7, 2004 #1
    a small object is placed 10cm from the center of a phonograph turntable. it is observed to remain on the table when it rotates at 33 1/3 rev/min but slides off when it rotates at 45 rev/min. Calculate the centripetal force.

    if anyone has any ideas what so ever they are greatly appreciated as i am all out.
  2. jcsd
  3. Nov 7, 2004 #2
    use: Fc=4π2mr/T
    however, you need a mass. Force is mass times acceleration. Without a mass, I'm not sure how you would find a force.
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