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Circular Motion and time

  1. Oct 13, 2008 #1

    MRD

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    1. The problem statement, all variables and given/known data
    The mass m = 10 kg and is attached to a string L = 0.027m, the mass moves in a circle and makes an angle of 32 deg. with the vertical, how long does it take to complete one revolution?


    2. Relevant equations

    radius = Lsin(angle)
    v=2pi(r)/T
    F= max (where F = Tx = -Ty)
    -Ty = m(v^2/r)

    3. The attempt at a solution
    I tried solving for velocity with T = 1, is this right?
    If the angle is wrt the vertical, does that mean I have to take 90 - the angle, inorder to change it wrt the horizontal and then use that angle to solve for radius?
    Any help would be great. Thanks.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 13, 2008 #2
    What do you mean T = 1? Do you mean T as the period or the tension?
    Yes, 90 - angle of vertical = angle from horizontal.

    You say F = Tx = -Ty

    Is T tension?
    Why does Tx = -Ty?
     
  4. Oct 13, 2008 #3

    MRD

    User Avatar

    T is the period
    I was going to use -Ty to solve the equation if I do not change the angle
    but so far I have tried to use the equation Fnet = ma
    Fnet = Tsin angle = ma
    a = v^2/r
    r = Lsin angle
    Tsin (angle) = m (v^2)/r(sin angle)^2 is this right?
     
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