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Homework Help: Rock whirling in vertical circle

  1. Dec 4, 2005 #1
    a rock whirls in a vertical circle of radius 8m. acceleration of gravity 9.8m/s^2

    what must the speed be to have tangential=radial acceleration when the string makes a 37 angle with respect to the vertical?

    is it Wsinangel=ma

    v=Wsinangle*r/m)^1/2 ?
  2. jcsd
  3. Dec 4, 2005 #2


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    Homework Helper

    If W is mg, then yes.

    v² = gr.sin@
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