I think that's for momentum scaling. But impact craters generally scale with energy. A portion of the projectile's energy is transferred to the target and excavates a crater (O'Keefe and Ahrens, 1977). So the excavated crater scaling is really somewhere between momentum and energy. The pi-scaling relation's give a weak dependence of crater diameter on energy D ~ KE^0.22 (Melosh, 1989), or D ~ v^0.44. I believe depth-to-diameter ratio is more or less constant (Nagel and Fechtig, 1980), at least for simple craters. So you'd get a similar scaling for depth on velocity. Of course, 2 km/s is hardly even hypervelocity, so this scaling might not even apply yet.

(I know, these are some pretty ancient references.)

Is it time to mention the obligatory xkcd comic for this topic?

https://xkcd.com/320/

Should we really be using the title "czar" for someone who's supposed to be addressing potential hacking by _Russia_? I realize that term is commonly used as an informal title for these kind of positions (though I never really understood how that got started). But it seems to be particularly absurd here.

Oh, dysentery! Your family got one of those luxury diseases. We couldn't even afford the common cold virus. Dysentery implies you had access to water. We had to stand around all day with our mouths open hoping a stray raindrop would fall in.

I'm fine either way... as long as I know ahead of time which it is!

And this is the time to follow up with the one about the horse that walks into the bar and the bartender asks "Why the long face?"

The reason to do it in this order is to put Descartes before the horse. I'll show myself out.

I still use my TI-85, twenty years later. Sure, it's antiquated at this point, but by now I've just gotten so used to the layout and functions that I don't know what I'm going to do when it finally goes.

There's a TI-81 around here somewhere also; that one I don't use any more.

Is there actually any evidence (beyond the hacker's assertion) that any contract actually exists?

You say that like it's a bad thing.

I can play it with the Prime app on my iPad and use Airplay to mirror the display on the Apple TV.

It's just a name. Like the "Death Zone" or the "Zone of No Return". All the zones have names like that in the Galaxy of Terror.

Why not Zoidberg?

*slow clap*

Well, depending on the quality of the finished product, the tasters might have gone double blind AFTER the experiment.

+1 Correct.