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Homework Help: Turning effects of forces 4

  1. Jul 4, 2009 #1
    Turning effects of forces 3

    1. The problem statement, all variables and given/known data
    A ruler of an unknown mass is 52.0cm long. To find out its mass, you put a stone of 100g on the ruler 3.0cm from its end and balance the ruler on a sharp edge. The ruler is balanced when the supporting edge is 15.0cm from its end. Calculate the mass of the ruler.

    2. Relevant equations
    I know that the force of the stone is 0.981N. But what do I have to do to find out the force pointing downward of the ruler, so that I can find the mass...?
    Last edited: Jul 4, 2009
  2. jcsd
  3. Jul 4, 2009 #2


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    Staff Emeritus
    Science Advisor
    Gold Member

    Re: Turning effects of forces 3

    This question is very similar to your other thread, turning forces 4 and can be tackled in a very similar manner.
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