Gun. Water. Physics. Awesome.

[The Mad Monk]

[Sava]

Cool

[pchang]

The bullet starts to tumble pretty quickly after leaving the barrel.

[KrazyHorse]

Incompressible fluid = drag which scales as square of velocity.

[The Mad Monk]

It's vaguely like what happens in collapsing stars, only with external pressure driving inward instead of gravity. It's just supercool.

[Dinner]

Incompressible fluid = drag which scales as square of velocity.

Which is why bullets only go a couple of feet into water.

[Fake Boris]

French subtitles

[regexcellent]

Incompressible fluid = drag which scales as square of velocity.

Admittedly this is from AP Physics C, so it was a bit simplified, and I took the class 4 years ago, but I remember learning that this is true of air resistance as well.

[Dinner]

French subtitles

Why pretend you can read and understand anything even slightly complex. Look, we've seen your posts in the other thread and we're still laughing at you.

[The Mad Monk]

French subtitles

Francophones desperately holding on

[regexcellent]

Why pretend you can read and understand anything even slightly complex. Look, we've seen your posts in the other thread and we're still laughing at you.

Wait are you telling me that Oncle Boris is a wannabe Quebecois and can't actually read French?

[Lorizael]

Admittedly this is from AP Physics C, so it was a bit simplified, and I took the class 4 years ago, but I remember learning that this is true of air resistance as well.

My understanding is that the drag equation (and its square velocity dependence) only applies when velocity is "high" (which makes the Reynolds number high). That's clearly the case with a bullet, so I would think that the relevant factor here is the density of the water.

[Hauldren Collider]

I used to work at a company that designed submarine control systems. I was told by one of the physicists there that air behaves almost exactly like water in most meaningful respects (just with lower density). They used the same formulas for their air simulations as for water.

[My Wife Hates CIV]

check out the Slow Mo Guys. I guess it's a couple of young guys with a 100k camera. anyway, some cool stuff there.