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Find the placement for 4th mass

  1. Jun 25, 2015 #1
    1. The problem statement, all variables and given/known data
    a meter stick is initially balanced on a fulcrum at its midpoint. you have four identical masses. three of them are placed at the following locations: 25 cm, 45 cm, and 90 cm. where should the fourth mass be placed in order to balance the meter stick?

    2. Relevant equations
    T=rxF ; m1r1+m2r2=m3r3=m4r4
    each mass is identical but the problem does not give a mass.

    3. The attempt at a solution
     
    Last edited: Jun 25, 2015
  2. jcsd
  3. Jun 25, 2015 #2

    haruspex

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    Please fill in the template. List any equations/principles you have been taught which you suspect are relevant and show your thinking so far.
     
  4. Jun 25, 2015 #3

    haruspex

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    Don't let that stop you. Just fill in the masses as an unknown m and trust that if there is no mistake in the question then m will disappear later.
    Is there a typo in there?
    What values for r1, etc. should you plug in?
     
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