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Center of Mass Question!

  1. Mar 9, 2013 #1

    dgx

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    1. The coordinates of the center of mass for the extended object shown in the figure are (L/4, −L/5). What are the coordinates of m1? (Assume m1 = 7 kg, m2 = 3 kg, and m3 = 5 kg. Use any variable or symbol stated above as necessary.)



    2.



    3. I too the centroid cordinates and substracted them from each corresponding x and y value in each coordinate. Then, distributed the mass to each corresponding coordinate...ie 7(x,y) = (7x,7y), then solved for x and y. My answer was (L/7, -21L/10). But its wrong. Anybody have any insight?
     
  2. jcsd
  3. Mar 9, 2013 #2
    Hello dgx!
    Can you upload the diagram for us?
     
  4. Mar 9, 2013 #3

    dgx

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    http://www.tiikoni.com/tis/view/?id=b95408f [Broken]

    http://www.tiikoni.com/tis/view/?id=b95408f [Broken]

    thanks
     
    Last edited by a moderator: May 6, 2017
  5. Mar 9, 2013 #4
    Use the definition of the centre of mass.
    You will get 1 equation for the x-direction and 1 for the y-direction.
    Each of these equations will only have 1 unknown.

    If you post your working we can see what you did.
     
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