"Euler's Disk" is a trademark for a product manufactured and distributed by the "Damert Company" (Toysmith Group), consisting of a metal disk, a base having an upwards-facing concave mirror, and holographic, patterned magnetic stickers. One or more magnetic stickers may be attached to the top surface of the disk. The disk, when spun on the mirror, exhibits a spinning/rolling motion. Euler’s Disk has an optimized aspect ratio and precision polished, rounded edges to maximize the spinning/rolling time. A coin spun on a table, or any disc spun on a relatively flat surface, exhibits essentially the same type of motion.

A spinning/rolling disk ultimately comes to rest; and it does so quite abruptly, the final stage of motion being accompanied by a whirring sound of rapidly increasing frequency. As the disk rolls, the point P of rolling contact describes a circle that oscillates with a constant angular velocity ω. If the motion is non-dissipative, ω is constant and the motion persists forever, contrary to observation (since ω is not constant in real life situations).

In the April 20, 2000 edition of Nature, Keith Moffatt shows that viscous dissipation in the thin layer of air between the disk and the table is sufficient to account for the observed abruptness of the settling process. He also showed that the motion concluded in a finite-time singularity.

Moffatt shows that, as time t approaches a particular time t0 (which is mathematically a constant of integration), the viscous dissipation approaches infinity. The singularity that this implies is not realized in practice because the vertical acceleration cannot exceed the acceleration due to gravity in magnitude. Moffatt goes on to show that the theory breaks down at a time τ before the final settling time t0, given by

\tau\simeq\left(2a/9g\right)^{3/5} \left(2\pi\mu a/M\right)^{1/5}

where a is the radius of the disk, g is the acceleration due to Earth's gravity, μ the dynamic viscosity of air, and M the mass of the disk. For the commercial toy (see link below), τ is about 10 − 2 seconds, at which \alpha\simeq 0.005 and the rolling angular velocity \Omega\simeq 500\rm Hz.

Using the above notation, the total spinning time is

t_0=\left(\frac{\alpha_0^3}{2\pi}\right)\frac{M}{\mu a}

where α0 is the initial inclination of the disk. Moffatt also showed that, if t0 − t > τ, the finite-time singularity in Ω is given by.....

http://en.wikipedia.org/wiki/Euler%27s_disk

Fail again. I was trying to be germanely humorous.

In fact, I find your observations to be penetrating and provocative.

This, cloud art, originated in Turkey and spread throughout the Empire. It is also known as marbling art or marbling paper.

The medium is floating paints on oil covered water, so everyone is right.


>> ^reiwan:

>> ^chicchorea:
Water colors in a new and improved way, new, at least to me.
Excellent find.

I think hes actually using oil paint, on water. Since oil does not mix with water he's able to manipulate it like that and it wont turn into a giant mix of colors. Thats my guess anyway.
edit - After watching a second video of him, I dont think that is water. It seems more viscous than water. As he moves his tools through the solution, there are no ripples or anything like you would see in water. I think its this - http://en.wikipedia.org/wiki/Sizing

>> ^chicchorea:

Water colors in a new and improved way, new, at least to me.
Excellent find.


I think hes actually using oil paint, on water. Since oil does not mix with water he's able to manipulate it like that and it wont turn into a giant mix of colors. Thats my guess anyway.

edit - After watching a second video of him, I dont think that is water. It seems more viscous than water. As he moves his tools through the solution, there are no ripples or anything like you would see in water. I think its this - http://en.wikipedia.org/wiki/Sizing

For those are unknowing in the ways of the pan:

"Food that sticks is caused by chemical bonds that form between the food and the material of the pan - almost always a metal. These bonds may be relatively weak van der Waals forces or covalent bonds. Protein-rich foods are particularly prone to sticking because the proteins can form complexes with metal atoms, such as iron, in the pan.

The oil, being liquid, fills in the valleys and caves of the pan surface. Although the pan may look smooth at a microscopic level the surface of even the smoothest metal pan looks rough with hills, valleys and even caves. Hot oil is more viscous than cold oil and will immediately flow filling the gaps.

When oil in the pan gets hot enough a steam effect begins to occur ---

"A small amount of oil added to a very hot pan almost instantly becomes very hot oil. The oil quickly sears the outside of the food and causes water to be released from the food. This layer of water vapor ("steam") lifts the food atop the oil film and keeps it from touching the hot pan surface. If the oil is not hot enough, the steam effect will not occur and the food will fuse to the (too) cool pan surface." Source: Ask a Scientist, Newton BBC" Source

They're talking about a viscous teenage beating that resulted in brain damage on a morning show. . . And the shocking bit is that she said cunt? Sometimes I can't tell if we're supposed to be cynically desensitized, or a nation of babies.

>> ^Hive13:

While I imagine there is more to this story that a misdemeanor marijuana charge, it is still pretty fucking sad, especially to do this in front of his kid.
That being said, I know several cops that have been badly injured serving warrants to people that owned Pit Bulls. They can be, but rarely are, mean, viscous killers. Seems like this cops didn't take a few extra moments to figure out which type of personality this dog had.


It really shouldn't have mattered what kind of personality the dog had.

IT WAS IN A FUCKING CAGE.

Seriously. How ball-less does someone have to be to shoot a caged dog?

While I imagine there is more to this story that a misdemeanor marijuana charge, it is still pretty fucking sad, especially to do this in front of his kid.

That being said, I know several cops that have been badly injured serving warrants to people that owned Pit Bulls. They can be, but rarely are, mean, viscous killers. Seems like this cops didn't take a few extra moments to figure out which type of personality this dog had.

I think what the election showed was that the insane and racist people are receding in power and can no longer win elections, nothing more. And like a cornered rat, they are getting ever the more viscous.

Tags for this video have been changed from 'viscously, verbose, vioced, vedentta' to 'viscously, verbose, vioced, vedentta, voila, villain, vicissitudes' - edited by gwiz665

It looks like it's just so viscous that at high velocities it approximately behaves as if it were solid. There's no evidence of an actual phase change going on.

>> ^EndAll:
...it's not just fluid, I think - it looked like a clump under the skin with bits being broken off with the pressure applied.. so it's more viscous and cheese-like...


This is Keratin - a semi-solid material consisting principally of sebum and dead skin cells.
They mention how badly it smells which suggests to me that it is probably infected, but given it's size I agree with deathcow that his immune system will handle this fine.

Probably discovered just how much of it there is in there.. it's not just fluid, I think - it looked like a clump under the skin with bits being broken off with the pressure applied.. so it's more viscous and cheese-like than they might have originally thought, when it was coupled with the blood and pus.

At 0:50 of the video, did he say Viscous Forces dampen Thetans down?

Is Xenu making the bubble move?

The Onion

OPINION
This New Toilet Paper Is So Soft And Absorbent!

By Ted Roman
Amazed Customer
May 3, 2000 | Issue 36•16

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And Cushy™ is more than just the most absorbent product ever designed, manufactured, and marketed for the purpose of wiping human waste from the rectal region; it's also the softest. I can't believe how good it feels pressed up against my asshole! Sure, I thought the leading brand was good, but after trying Cushy™, I could scarcely believe the difference! Compared to the sumptuous comfort of Cushy™, the leading brand feels like a portable electric belt-sander grinding my ass down to a chafed and bloody pulp! Wiping with Cushy™, on the other hand, feels as if the defecation residue between my legs is being spirited away on the back of a pillowy-soft cartoon cloud! It's enough to make a person open up a window and shout to the world, "Shit, I Love This Ass-Paper!®"

Cushy™ goes the extra mile to make sure my anus feels pampered like a dainty princess. That's because Cushy™'s not just about getting your ass free of shit particles. It's about treating your entire backside to a feeling of cushiony goodness. It's what the good folks at Global Tetrahedron Forestries, manufacturers of Cushy™, like to call "T.A.C."–Total Asshole Comfort.™ Doesn't your asshole deserve a little T.A.C.?

Your anal region, from your ass cheeks to your dilated sphincter to the interior of your anal column itself, works hard for you each day. Isn't it time you gave a little something back? With Cushy™, my asshole feels as if it's being gently wafted skyward on a freshly scented summer breeze! Try getting that level of comfort from those bargain brands!

Do the other brands offer patented three-ply quilted comfort? Are they lightly perfumed and softened with soothing aloe-based moisturizing lotions? Do they offer Cushy™'s exclusive "Complete Asshole Guarantee®"? Of course not. Whether you've got a thin, runny liquid, a huge, bulky chunk, or even one of those hard-to-wipe, viscous-sludge-type defecations, Cushy™ not only has the absorbency needed to wipe your ass completely free of sticky, after-shit smears and stains; it's gentle enough to make your puckered butthole feel like the King of Siam, reclining on a mound of the finest silk pillows in all of Asia.

Sure, Cushy™ costs a bit more than less ass-pampering brands, but my ass is worth it! Cushy™ is so soft, sometimes I want to take a shit even when I don't have to! Once you've seen for yourself how wonderful, how majestic, how truly awe-inspiring this new bathroom tissue is, you'll know why people say, "Cushy™... You're Gonna Shit Your Pants!©"

My understanding is that the Kaye effect occurs in shear thinning liquids, and I'm not sure that silicone oil fits that category. Is the same effect at work in all these videos?


I suspect that it is the same effect. He isn't clear what fluid the jet is in the first part, but near the end he mentions pouring mineral oil into a pan of the same. Both mineral oil and silicone oil are polymeric fluids, and will most likely display shear thinning behavior. I suspect the main difference between this and the shampoo videos is that here the jet is a much larger diameter and therefore has more momentum, deflecting the surface and setting up the bounce. In the shampoo videos, the jet doesn't have the momentum to displace the surface, and so only starts to jump as the material settles. Note that the bounce occurs as the flow rate of the jet decreases, so presumably there is an energy balance between surface tension and momentum (maybe viscous forces as well?) that determines whether the jet simply pierces the surface, or sets up the bounce.

Thanks for the sift, I'll probably spend the rest of the day looking into this more instead of doing the research I should be.