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I think the simplest answer to this question is a thought experiment.
Suppose you have a long rod, one end of which is up against a box, the other
end is free, e.g.:
_____________
| | _very_ long rod (longer than this)
| box |==========================================<--Force
| |
_____________|___________|____________
You apply a force to one end of the rod. Will the box move right away?
Next question: does this invalidate Newton's 3rd Law?
:)
Mike Thayer
Laboratory for Astrophysics & Space Research
The University of Chicago
thayer@odysseus.uchicago.edu | http://astro.uchicago.edu/home/web/thayer/