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Having trouble with a center of mass problem

  1. Oct 31, 2012 #1
    1. The problem statement, all variables and given/known data

    See the attachment below. The solution is stated to be number 4 (option a). I am having trouble understanding this. It seems that a majority of the sculpture's mass (in terms of its y-component) is well below the vertical component of point 4, and hence should lower the CM from where 4 is. I know the question asks for the "most likely" choice, but 3 seems more appropriate, no?


    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

    Last edited: Oct 31, 2012
  2. jcsd
  3. Oct 31, 2012 #2
    I agree. It's a very bad question. None of those points are anywhere near where I would expect the CoM.

    You can prove the point by making a model out of card.
     
  4. Oct 31, 2012 #3

    CWatters

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    Can't possibly be "4" for the reason you state. I'm not convinced 2 or 3 is right either as too much area above those points.
     
  5. Oct 31, 2012 #4

    haruspex

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    I'd put it about half way between 3 and 4. Very sloppily constructed question.
     
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