I haven’t had much chance to sit and think about this, but that’s no reason to keep my readers away from it. Elke Stangl has been pondering a probability problem regarding three intersecting lines on a plane, a spinoff of a physics problem about finding the center of mass of an object by the method of pinning it up from a couple different points and dropping the plumb line. My first impulse, of turning this into a matrix equation, flopped for what were as soon as I worked out a determinant obvious reasons, but that hardly means I’m stuck just yet.
nebusresearch 
Thanks a lot for the pingback! I feel better now as the puzzle does not seem to be very easy to solve :-)
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I have got very interesting comments by other physicists on my blog – including a promising solution. I have appended my post now with a drawing related to this idea.
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Oh, that’s great. I’m glad you are getting useful comments; I keep finding I can’t quite put enough focus on the problem for my tastes.
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