space uncle posted:

Terminal velocity of rain is 16-25 MPH:
https://www.uu.edu/dept/physics/scienceguys/2001Mar.cfm#:~:text=A%20smaller%20raindrop%20of%20radius,when%20they%20begin%20their%20descent.

Pee is 95% water, so the remainder is negligible physics wise:
https://www.bbc.co.uk/bbcthree/arti...blems.%E2%80%9D

All mammals (despite bladder size), pee for approximately 21 seconds:
https://www.discovermagazine.com/planet-earth/regardless-of-bladder-size-all-mammals-pee-for-approximately-21-seconds-with-video-goodness

Let's assume the piss starts from rest and reaches a terminal velocity of 25MPH, which is 11.176 m/s. With g= 9.8 m/s^2 this takes 1.14s until it doesn't fall any faster.

In 1.14s the piss travels 6.48m using the
deltaX = t*(v+v0)/2 equation.

In the remaining 20s of pissing it is traveling at 11.176 m/s, so it travels a further 223.52m.

So if you start pissing at a height of 230m, you will finish your piss before the first drop hits the ground.

For an example of what you need to piss off of to achieve this feat:
http://www.bluebulbprojects.com/measureofthings/results.php?comp=distance&unit=m&amt=230&sort=pr&p=1

The best piss object they list is the Eiffel Tower, which gives you plenty of margin to piss from the top and meet your goal. The Golden Gate Bridge is pretty close to ideal, pissing wise. The Washington Monument, Space Needle, and St. Paul's Cathedral are all a bit too short.

LifeSunDeath posted:

Sadly, there is no known structure tall enough for me to pee off of without my penis making contact with the ground due to its extreme length.

Data Graham posted:

All Mammals Pee For 21 Seconds is my favorite useless fact

space uncle posted:

Impossible according to this nerd:

https://www.quora.com/How-much-water-would-have-to-be-dropped-on-a-person-from-a-certain-height-to-kill-them

You can drown someone, but you can’t crush someone with water.

Trevor Hale posted:

I remember when that research won an award and it was the most mesmerizing thing I’d ever read.

edit: wait. If I jump from the Golden Gate Bridge into water, I will die. Will not X amount of water dropped on me from the height of the Golden Gate Bridge kill me?

edit edit: oh I guess that’s terminal velocity I’m not counting for

StillFullyTerrible posted:

if they're on a surface like concrete, the impact from a sufficiently large amount of water can very easily smash their head into the ground hard enough to kill them

StillFullyTerrible posted:

the surface tension of the water acting as a solid for an instant is what kills you when you drop onto it from a great height

Memento posted:

It's got nothing to do with the surface tension, it's about the fact that water really doesn't like to compress, and that when you hit it hard enough it will try to compress because it can't get out of your way fast enough.

Same deal as re-entry into the atmosphere. It's not friction that burns things up, it's the air compressing in front of the object hitting the atmosphere at several kilometers per second.

Bloody Hedgehog posted:

Any amount of water dropped from skyscraper height would just atomize and be a nice rainshower by the time it got to the ground.

Sagebrush posted:

i suspect this is untrue for amounts such as the volume of lake ontario, etc

Trevor Hale posted:

So the air resistance on the way down when dropping water from a height starts the compression before it gets to my head? Whereas me jumping from a bridge doesn’t turn me into a shower so I hit the water like the tubby gently caress I am and explode against the un-compressed surface?

Bloody Hedgehog posted:

Look, the Aqua Incident of Pittsburgh only happened once. There's no need to bring it up again.

PainterofCrap posted:

^^ bien sur! ^^^


Passing laws to restrict cosmic ray bombardment to own the libs

The Bloop posted:

It really is time to start working on that space elevator

Big Bad Beetleborg posted:

urethra dimension

LifeSunDeath posted:

RandomFerret posted:

https://va.media.tumblr.com/tumblr_qgkg4yULmI1xf5o27.mp4

RandomFerret posted:

https://va.media.tumblr.com/tumblr_qgkg4yULmI1xf5o27.mp4

A HORNY SWEARENGEN posted:

Trying to do the math on how wide your urethra would be to produce a column of water with enough mass to kill someone and realizing it's too advanced for me so I'll see what my physics professor has to say.

For now, we can assume 200 gallons of shaving cream dumped in 2 seconds from 30 feet was nearly fatal to the actor who played Walter Peck in Ghostbusters, so approximately a 9 foot diameter urethra with a 250 gallon bladder with no bottleneck should do the trick.

A HORNY SWEARENGEN posted:

The normal psi of a urine stream is about 0.5 and a water jet cutter runs about 90,000 psi.

So if you want to kill someone with your piss laser you'd need to have roughly a 0.75mm urethra (average is about 9mm) and ureter smooth muscle contractions that have the force equivalent of being able to lift 600 tons in order to still only have an effective killing range of about 6".

Clearly the superior killing piss is the wide bore.

A HORNY SWEARENGEN posted:

you'd need to have roughly a 0.75mm urethra (average is about 9mm)

RandomFerret posted:

This is very concerning

A HORNY SWEARENGEN posted:

The normal psi of a urine stream is about 0.5 and a water jet cutter runs about 90,000 psi.

So if you want to kill someone with your piss laser you'd need to have roughly a 0.75mm urethra (average is about 9mm) and ureter smooth muscle contractions that have the force equivalent of being able to lift 600 tons in order to still only have an effective killing range of about 6".

Clearly the superior killing piss is the wide bore.

RandomFerret posted:

This is very concerning

A HORNY SWEARENGEN posted:

The normal psi of a urine stream is about 0.5 and a water jet cutter runs about 90,000 psi.

So if you want to kill someone with your piss laser you'd need to have roughly a 0.75mm urethra (average is about 9mm) and ureter smooth muscle contractions that have the force equivalent of being able to lift 600 tons in order to still only have an effective killing range of about 6".

Clearly the superior killing piss is the wide bore.

space uncle posted:

The best piss object they list is the Eiffel Tower, which gives you plenty of margin to piss from the top and meet your goal. The Golden Gate Bridge is pretty close to ideal, pissing wise. The Washington Monument, Space Needle, and St. Paul's Cathedral are all a bit too short.

Slippery posted:

Truly SA is a bastion of knowledge.

Galewolf posted:

Just wanted to drop by and say that I appreciate random forklift operator / welder memes posted irregularly in this thread despite being an white collar virgin.

Yestermoment posted:

Welcome to...

Superterranean posted:

font of knowledge, surely.