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Homework Help: 2 masses connected by a pulley

  1. Sep 18, 2007 #1
    1. The problem statement, all variables and given/known data

    Mass m1=28.1 kg is on a horizontal surface, connected to mass m2= 6.70 kg by a light string as shown. The pulley has negligible mass and no friction. A force of 231.3 N acts on m1 at an angle of 29.5o.

    2. Relevant equations

    I can't seem to get the correct answer for this one.
    I get this equation for the horizontal forces on m1:

    m1a = Fcos(theta) -T -ukm1g +ukFsin(theta)

    And this one for the vertical forces on m2:

    m2a = T -m2g

    I can combine these equations and solve for a, but that
    doesn't seem to be working out for me. Any suggestions?

    3. The attempt at a solution

    I plugged in all of the numbers, but it does not seem to be working out
  2. jcsd
  3. Sep 19, 2007 #2


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    Homework Helper

    Seems right to me. What is the coefficient of friction? What number do you get for a?
  4. Sep 19, 2007 #3
    you posted this on lon capa too.. how did you get T ??
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