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Homework Help: Find the radius

  1. Feb 13, 2012 #1
    1. The problem statement, all variables and given/known data

    A block of mass m1=2kg is attached to a cord. The cord goes down through a hole in the table and is attached to mass m2=4 kg hanging below the table. The 2 kg mass moves on the table in a circle at a speed of 3.5 m/s the table top is friction less and there is no friction between the cord and the side of the hole. What is the radius of the circle if the 4 kg mass remains at rest?

    2. Relevant equations

    Sum of force x direction m1: T=mv^2/r

    Sum of forces y direction m1: N-mg=mv^2/r

    Sum of forces x direction m2: Mg-t= Mv^2/r

    3. The attempt at a solution

    I have tried to use this equations and i cannot come up wit the solution. Do i have my equation correctly in this problem?
  2. jcsd
  3. Feb 14, 2012 #2
    I guess you use orbital length to get the answer :P
    Last edited: Feb 14, 2012
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