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Actually, I think the original graph (of e^(-x)), goes from +infinity (for x approaches -infinity) to approaching zero (for x approaches +infinity)
(and of course the graph crosses the x=0 point at y=1)
Rotating would yield y= -infinity to y approaches zero
(for x=<-infinity, +infinity>).
I would have no idea on the "center of mass" value, I do not know the concept.
Edit: I think I misunderstood Frozen North's post, we probably share the same notion of the graph.
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