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Homework Help: Uniform Circular Motion Problem. Help!

  1. Oct 13, 2016 #1
    1. The problem statement, all variables and given/known data
    A stone tied to a string with length 1.10 m is whirled in a circle both horizontally and vertically with the same constant speed. In the vertical case the maximum tension in the string is 15.0% larger than the tension that exists when the string was horizontal. Determine the speed of the stone.

    2. Relevant equations
    a = v2/r

    3. The attempt at a solution
    for horizontal, my equation was Fc = mv2/r

    for vertical, my equation was Fc = Ft - mg, because at the bottom of the vertical circle fg is present
    mv2/r = 0.15Ft - mg

    I dont know how to take this further
  2. jcsd
  3. Oct 13, 2016 #2


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    Science Advisor
    Homework Helper
    Gold Member

    Consider the horizontal case in more detail. There are vertical forces too. You should be able to find a relationship between the speed, the string length, and the tension.
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