Re: Kinetic impacts

On 31 juuli, 06:57, thro...@xxxxxxxxx (Wayne Throop) wrote:
: Michael Ash <m...@xxxxxxxxxxx>
: So then the question is, does going faster help or hinder?
:
: Seems to me with a real simple analysis that it hinders. After all, if you
: drop a small rock from the top of the atmosphere, it will hit the ground.
: But if you drop it at that height at orbital speed, it will burn up.
: If you extend this futher, you'd assume that rocks need to be larger to
: survive passage at higher speeds.

Yes, seems like.

: [...] it's a runaway reaction, wherein the initial interaction causes
: it to deform which causes it to encounter more air which causes it to
: deform further etc.,

This is an engineered slug; is the notion from elsethread that the
first few grams of air encountered caue it to vaporize entirely and start
expanding at 4km/sec necessarily so? Hm. At that speed, I suppose so. No
time to ablate nor nuttn (though... hm...)

The faster the movement, the faster the ablation.

Suppose that a nitrogen molecule, mass 28, collides with a tungsten
atom on crystal surface, mass 180, arriving at 4 km/s, and its whole
energy were turned into kinetic energy of the nucleus. This would move
the atom at roughly 1,6 km/s. Speed of sound is about 5 km/s from what
I remember. The tungsten atom stays bound and its energy is dissipated
around crystal (as heat) - so is momentum (as force).

Now imagine that a molecule arrives at 4000 km/s. Its kinetic energy
is now enough to knock thousands of tungsten atoms off the surface at
speeds of many km/s.

The faster a given distance is covered, the more energy released.
.

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