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-   -   Most Revolutionary Physics Research Ever (http://www.actuarialoutpost.com/actuarial_discussion_forum/showthread.php?t=291344)

clarinetist 02-25-2015 09:43 PM

Most Revolutionary Physics Research Ever
 
http://arxiv.org/abs/1310.3737

Abstract:
Quote:

Many urological studies rely upon animal models such as rats and pigs whose urination physics and
correlation to humans are poorly understood. Here we elucidate the hydrodynamics of urination
across five orders of magnitude in animal mass. Using high-speed videography and flow-rate measurement
at Zoo Atlanta, we discover the “Law of Urination,” which states animals empty their
bladders over nearly constant duration of 21 ± 13 seconds. This feat is made possible by larger
animals having longer urethras, thus higher gravitational force and flow speed. Smaller mammals
are challenged during urination due to high viscous and surface tension forces that limit their urine
to single drops. Our findings reveal the urethra constitutes as a flow-enhancing device, enabling
the urinary system to be scaled up without compromising its function. This study may help in
the diagnosis of urinary problems in animals and in inspiring the design of scalable hydrodynamic
systems based on those in nature.
Methods:
Quote:

We film urination of sixteen animals (Figure 1(a)-(d)) and obtained twenty-eight urination videos
from YouTube. Figure 1(h) shows the duration of urination across 6 orders of magnitude of animal
mass from 0.03 kg to 8000 kg. Despite this large range, the duration remains nearly constant,
T = 21 ± 13 seconds (N=32) for all animals heaver than 3 kg. This constancy of emptying time
is quite a feat upon consideration of the substantial bladders of larger animals. The urination
duration for both jetting and dripping regime are modeled in the Supplement.
Enjoy :razz:

The Drunken Actuary 02-25-2015 10:08 PM

:clap:

ActuateThis 02-25-2015 10:13 PM

Some at my office sometimes comes in and pees extremely forcefully for like 4 seconds. I'm starting to think they might be a eunuch.

Note: I don't really know how eunuchs pee.

MathStatFin 02-25-2015 10:28 PM

Einstein would be proud.

Pseudolus 02-25-2015 10:39 PM

How would a longer urethra help to pee faster? Cross-sectional area, sure.

cmind 02-25-2015 10:40 PM

I see an Ignobel Prize in someone's future...

Suttree 02-25-2015 10:48 PM

Quote:

Originally Posted by Pseudolus (Post 7942963)
How would a longer urethra help to pee faster? Cross-sectional area, sure.

Those of us with longer urethras know the answer to this ;), those of you without will just have to wonder. PS faster urination is not the biggest advantage offered :-D

Brony 02-26-2015 08:50 AM

http://www.candywarehouse.com/produc...-4-piece-pack/

http://www.candywarehouse.com/assets...-126609-im.jpg

Guest 02-26-2015 08:54 AM

Quote:

Originally Posted by Suttree (Post 7942972)
Those of us with longer urethras know the answer to this ;), those of you without will just have to wonder. PS faster urination is not the biggest advantage offered :-D

Faster ejaculation too?

Abelian Grape 02-26-2015 09:07 AM

Chick: "So, what do you do for a living?"

Researcher dude: "I film animals peeing"


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