On 29 Mar 2006 14:11:40 GMT, in uk.sci.astronomy ,
(Richard Tobin) wrote:

Consider two blades, one moving up the y axis at 1 m/s, the other with
its edge at a very small angle to the x axis, say along the line
y = x / 10^10. Suppose at t=0 the first blade's edge is at y=0, so that
at time t its edge is along the line y = t.

Nothing is accelerating, no forces are acting, nothing physical is
moving at more than 1 m/s. No relativistic mechanics are involved.

You've merely picked a bad frame of reference, and are applying
inadmissible maths to it. You can do the same parlour trick with
pretty much anything if you choose to ignore or sidestep the hard
maths. I've seen proofs that circles have smaller circumferences than
the inscribed square, that -1==1 and so forth, done similarly.

The locus of the intersection of the blades is (10^10t, 0).

In a bad frame of reference, and using inapplicable maths.
Mark McIntyre
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