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String rotating to make a cone, find period and tension

  1. Mar 6, 2010 #1

    s3a

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    1. The problem statement, all variables and given/known data
    "A mass m = 16.0 kg is attached to the lower end of a massless string of length L = 71.0 cm. The upper
    end of the string is held fixed. Suppose that the mass moves in a circle at constant speed, and that the
    string makes an angle theta = 25deg with the vertical, as shown in the figure."
    (See attachment on page 2)


    2. Relevant equations
    T = 2pi*r/v


    3. The attempt at a solution
    I found tension = (16)(9.8)/(cos25deg) (not sure if this is the correct answer though but I think it is)

    T = 2pi*r/v I found radius = 0.71m * (sin25deg)
    but I need to find velocity I'm guessing so that I can get period T.

    Any help would be greatly appreciated!
    Thanks in advance!
     

    Attached Files:

  2. jcsd
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