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Homework Help: Tension problem

  1. Sep 18, 2010 #1
    1. The problem statement, all variables and given/known data
    2. There are four masses hanging by a rope from the
    ceiling, as shown in the figure. Two of the tensions
    and three of the masses have been measured.
    Show that the fourth mass can be expressed as
    m4 =[m1T2/(T1 − T2)]− m2 − m3.

    2. Relevant equations
    F=ma, F1=-F2, T=ma

    3. The attempt at a solution
    I think that (m1+m2+m3+m4)g=T1 and (m2+m3+m4)g=T2
    I tried solving for g and substituting and try and solve for m4 but I just find it impssible to do.
  2. jcsd
  3. Sep 19, 2010 #2


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    Science Advisor
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    Gold Member

    We can't help you unless we see the figure that goes with this question.
  4. Sep 19, 2010 #3
    I tried copying and pasting from a pdf file but it didn't work but it's really easy actually I already figured it out, :). Thanks anyways.
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