Slashdot Mirror
The Weird Science of Tossing Stones Into a Lake
Interoperable writes "Researchers in Spain and the Netherlands add another piece to a centuries-old puzzle in physics: the dynamics of an object falling into water. This common occurrence has a complex anatomy that includes a thin 'crown splash' around the perimeter of the impact, a deep cavity of air following the impactor, and a high, narrow jet of water that results from the collapse of the cavity. The new research, recently published in Physical Review Letters, demonstrates that airflow through the neck of the collapsing cavity reaches supersonic speeds despite low relative pressures between the air in the cavity and ambient pressure. Such an effect has no analogue in aerospace engineering or other sciences because of the highly dynamic nature of the collapsing nozzle structure." It's funny that the APS wants to charge non-subscribers $25 to download what is available for free on the arXiv.
It's funny that the APS wants to charge non-subscribers $25 to download what is available for free on the arXiv.
You're right. That is funny!
Feels weird hitting the Read More link and seeing nothing.... Creeps me out. I am outta here.
The only way to appreciate the science of tossing stones into a lake is to be stoned yourself.
Rob "CmdrTaco" Malda is a 29-year old white male with a stocky build and a goatee. He responded to my ad to be interviewed for this article wearing only leather pants, leather boots and a leather vest. I could see that both of his nipples were pierced with large-gauge silver rings.
Questioner: I hope you won't be offended if I ask you to prove to me that you're a nullo. Just so that my readers will know that this isn't a fake.
CmdrTaco: Sure, no problem. (stands and unbuckles pants and drops them to his ankles, revealing a smooth, shaven crotch with only a thin scar to show where his genitals once were).
Q: Thank you. That's a remarkable sight.
(laughs and pulls pants back up). Most people think so.
Q: What made you decide to become a nullo?
(pauses). Well, it really wasn't entirely my decision.
Q: Excuse me?
The idea wasn't mine. It was my lover's idea.
Q: Please explain what you mean.
Okay, it's a long story. You have to understand my relationship with Hemos before you'll know what happened.
Q: We have plenty of time. Please go on.
Both of us were into the leather lifestyle when we met through a personal ad. Hemos's ad was very specific: he was looking for someone to completely dominate and modify to his pleasure. In other word, a slave.
The ad intrigued me. I had been in a number of B&D scenes and also some S&M, but I found them unsatisfying because they were all temporary. After the fun was over, everybody went on with life as usual.
I was looking for a complete life change. I wanted to meet someone who would be part of my life forever. Someone who would control me and change me at his whim.
Q: In other words, you're a true masochist.
Oh yes, no doubt about that. I've always been totally passive in my sexual relationships.
Anyway, we met and there was instant chemistry. Hemos is about my age and is a complete loser. Our personalities meshed totally. He's very dominant.
I went back to his place after drinks and had the best sex of my life. That's when I knew I was going to be with Hemos for a long, long time.
Q: What sort of things did you two do?
It was very heavy right away. He restrained me and whipped me for quite awhile. He put clamps on my nipples and a ball gag in my mouth. And he hung a ball bag on my sack with some very heavy weights. That bag really bounced around when Hemos fucked me from behind.
Q: Ouch.
(laughs) Yeah, no kidding. At first I didn't think I could take the pain, but Hemos worked me through it and after awhile I was flying. I was sorry when it was over.
Hemos enjoyed it as much as I did. Afterwards he talked about what kind of a commitment I'd have to make if I wanted to stay with him.
Q: What did he say exactly?
Well, besides agreeing to be his slave in every way, I'd have to be ready to be modified. To have my body modified.
Q: Did he explain what he meant by that?
Not specifically, but I got the general idea. I guessed that something like castration might be part of it.
Q: How did that make you feel?
(laughs) I think it would make any guy a little hesitant.
Q: But it didn't stop you from agreeing to Hemos's terms?
No it didn't. I was totally hooked on this man. I knew that I was willing to pay any price to be with him.
Anyway, a few days later I moved in with Hemos. He gave me the rules right away: I'd have to be naked at all times while we were indoors, except for a leather dog collar that I could never take off. I had to keep my balls shaved. And I had to wear a butt plug except when I needed to take a shit or when we were having sex.
I had to sleep on the floor next to his bed. I ate all my food on the floor, too.
The next day he took me to a piercing parlor where he had my nipples done, and a Prince Albert put into the head of my cock.
Q: Heavy stuff.
Yeah, and it got heavier. He used me as a toilet, pissing in my mouth. I had to lick his asshole clean after he
...that a story about tossing stones in a body of water would be picked up by an IT and technology news site.
Slashdot has officially jumped the shark with this splashing story. Really, who gives a toss?
It's funny that the APS wants to charge non-subscribers $25 to download what is available for free on the arXiv.
Funny or not, there are actually a few differences between the papers.
If you promise not to mess with the nature of my nozzle's highly dynamic collapsing nozzle-structure, I won't mess with yours - unless you want me to, of course, in which case I would expect to be able to count on reciprocity.
I think that's only fair, I mean, especially given that we just met and all. Let's just hope your nozzle hasn't been anywhere unseemly lately. I hate unseemly nozzles and I have no use for any with a rather static collapsing nozzle-structure, as I'm sure most people do. yuck....
Imagine what the U.S.'s technology leadership could've been like if we had put a President in the White House who truly understood this kind of cutting-edge science.
10 PRINT CHR$(205.5+RND(1)); : GOTO 10
Neat! I want to see what that cone looks like as it develops, in super-slow motion.
Offtopic: I can't reply to the Racist Facial thread - all the Reply buttons are missing in both Camino and Firefox, and obviously I can post this thread. What gives?
Just some pieces of info for people who might not know:
Nowadays, all the major publishers dont have an issue if you post a prepring on arxiv, prl included.
If you want to get a preprint out, the procedure is as follows:
1) You put something on arxiv and submit it to PRL. /etc.
2) After a few weeks/months, you get your referee reports.
3) Then you revise it, and update your arxiv version.
4) Paper gets accepted. Paper is entering the editorial process, and you get proofs.
-> at this point, APS has contributed to the paper. The specific version proofed by PRL can no longer be uploaded to ARXIV
5) Final corrections, ready to print.
Nowadays, the proof and setting part is relatively minor. Most likely you will have written it in RevTex, and have PDF figures, so its an no issue.
But they still allow you to send them the text in word and the figures in phyical form (ink drawing, whatever), if you are really interested in it not getting published quickly.
So for most issues, a paper on Arxiv might be 99.9% identical to the final published paper, and only diiffer by the editorial issues. But you cannot know it. It might also represent a state from before the peer review.
HI O WISE PRINCE. WHT TOOK U SO DAM LONG?
After I RTFA I was all excited to see some cool video simulation or animations of this effect....
It's funny that the APS wants to charge non-subscribers $25 to download what is available for free on the arXiv.
If there's somebody stupid enough to pay for it, there's always somebody smart enough to charge for it.
Economic Darwinism hard at work, parting fools from their money since before 5,000 BC.
I work for the Department of Redundancy Department.
It's funny that the APS wants to charge non-subscribers $25 to download what is available for free on the arXiv.
It's not that funny - the version subscribers can download from the APS has, amongst other things, a guarantee that it has had at least one cursory review. While it is true that the arxiv also filters out almost all spam and quite a few of the crackpot submissions, it is still chock-full of total bullshit. Say what you like about APS being the "accepts anyone" whore of the scientific community, the arxiv does not review submissions and probably never well.
Add to this the fact that the vast majority of people reading grabbing papers directly from the APS site will have either individual or institutional membership, thereby paying somewhere between $1 and $0.001 per paper, and you can hopefully see that the APS is not trying to rip people off or make everyone miserable. I imagine they're registered non-profit...
I'd love to see the testing process for this.
Tries 1 - 100
1. Plop ....
2. Plunk
3. Plunk
4. Bloop
5. Plunk
Give me a grant!
My younger brother discovered a key principle of the viscosity of fluids when he was 12 years old. He and his friend decided to drop a gigantic boulder down the center hole of an outhouse, they were standing over the "opening" to see the effect.
I imagine the sound was much "deeper" but their screams were really high.
It was a 2 mile walk to the nearest running water for them, our camping trips were never the same after that.
Tisha Hayes
I read the title as "The weird Science of Tossing Salad"
UPON SINKING: The sinked shall yell "I sank it!" or something equally as thoughtful.
The more important question is: is it better to flush the toilet with the lid closed or with it open? I'm thinking about the quantity of residual feces and urine deposited on my toothbrush.
In theory, keeping the lid closed may cause an increased air suction effect into the bowl and, as a result, increased atomization of liquid-agitated turds into the bathroom environment as it shoots out from the smaller openings created between the lid and the porcelain.
Anything that results in less shit in my mouth is OK with me.
Cool technique. I wonder if they played "Smoke on the water" in the background ;P~~~
These posts express my own personal views, not those of my employer
How Profound:The high air speeds are shown to result from the "nozzle" being a liquid cavity shrinking rapidly in time.
Got Code?
I read that as "The Weird Science of Shoving Greased Up Yoda Dolls Up My Ass"
For anyone who cares: Her name was: Amélie Poulain.
___ ;)
*Waiting for the about 3 french female geeks who get it*
Any sufficiently advanced intelligence is indistinguishable from stupidity.
All I got was, "The Weird Science of Tossing" and thought you could get a grant for any kind of wankery these days.
Calling someone a "hater" only means you can not rationally rebut their argument.
Designed for mere mortals to read, should really have been included by the OP. http://physics.aps.org/viewpoint-for/10.1103/PhysRevLett.104.024501
1.) When the ball reaches the fluid it momentarily stops
2.) Just as the balls is completely below the fluid line it appears to stop again
3.) As the ball travels through the fluid, the INNER wall of separated fluid remains surprisingly straight for a surprisingly long period of time, yet the OUTER wall appears to be in constant motion
4.) Just before the ejected column of fluid collapses, a bright flash (a bubble perhaps) appears within the 'dome' of the ejection. This appears to change in intensity, becoming brightest just before the column collapses.
I'd like these particular events explained: e.g. The balls apparent momentary stop as it reaches the surface.
So, the big question is: when will the first computer game that features realistic water splashes be released?
I took this over the holiday break while bored:
http://links.cse.msu.edu:8000/members/matt_gerber/images/a/ac/Thumbtack.jpg
Lottery in June. Corn come soon....
Please do not read this sig. Thank you.
This explains the "Kerplunk" sound of a softball or slightly larger sized rock dropped into water. It's the initial splash "Ker" and the collapsing cone "Plunk".
-Eric