Video

yep! It is serious. Very serious.

Awesome!

Yes, they have. Thank you for sharing this lovely moment.

The launch angle is about 4 degrees but this is not critical. It can be launched at a higher or lower angle and still work correctly. Because the launch angle only influences the frequency of the oscillation and has no effect on the direction of the plane of oscillation. The direction of the plane of oscillation only changes because of the Coriolis Force, which is constant no matter the launch angle.

@@jazzani95 Muchas gracias Jerry por tus orientaciones,otra pregunta sabes como puedo ponerle un dispositivo electronico para que no se pare,y dure por lo menos 24 horas para ver el efecto de foucault mejor?,ya que en la zona de mi pais Republica dominicana,la rotacion es baja para 1hora

@@fundamentosdeingenieriamec8509 It is not trivial to drive a Foucault pendulum so that it will sustain the amplitude of oscillation. Because the driving force must be designed so that it does not interfere with the direction of the plane of oscillation. The only advice I can offer is to refer you to this article published in the American Journal of Physics and to give you a link to a driven Foucault pendulum that was constructed from this design.: R. Stuart Mackay, Sustained Foucault Pendulums, AJP 21, 260-266 (1953). physicslearning2.colorado.edu/QOTWSite/services/demos/demosd5/d5-16.htm

That is the Logger Pro software from Vernier www.vernier.com/product/logger-pro-3/

www.vernier.com/products/

It's a 100 Watt compression horn driver: www.parts-express.com/eminence-psd-2002s-8-1-titanium-driver-8-ohm-1-3-8-18--290-446

Hi Steven, yes the rate of precession is correct for our latitude. More info here, docs.google.com/document/d/1r27VunSb9hXDuLPw798PxEp8laVfKY3pd8jh--bOhrc/edit

When liquid helium has passed through the lambda point transition and has become a superfluid then it can pass through a superleak. A superleak is a leak that is so small it is microscopic and an ordinary liquid that has viscosity cannot pass through it. But superfluid helium has no viscosity and therefore can pass through a microscopic superleak.

That's incredible!

Does it have magnetic properties?

@@GeraldZani so awesome :-)

@@GeraldZani Would it be hypothetically possible to make a "perfect container", that is flawless with no superleak? or is it just the space between the atoms that make the leaks possible? Even if we could, the superfluid helium would still "climb" on the wall of the container and leak right?

The string is 10 feet long, but that is not important. The length could be made shorter or longer and it will still work. The bob is about 2 Kg.

This video is part 2 of a three part series called "The Challenge of Quantum Reality" by the Perimeter Institute. czcams.com/video/uhyKN4utUkA/video.html&ab_channel=stevebd1

No. We do not have a set up with particle detectors at the slits.

Thanks for the information. Do you know if such an experiment exists? All the text books say that when particle detectors are placed in each slit, only two band appear. The argument is based on the assumption that when a particle is observed, it materializes and hence, we can trace back the origin of that particle.

I recommend to watch the Richard Feynman Messenger Lectures, Lecture number 6, The Quantum Mechanical View of Nature. www.cornell.edu/video/richard-feynman-messenger-lecture-6-probability-uncertainty-quantum-mechanical-view-nature

The lecture is indeed fantastic. But, again, we don't have access to the raw data. The authority of Feynman, however, more than compensates this apparent absence of information:)

Here is a good three part series called "The Challenge of Quantum Reality" by the Perimeter Institute: czcams.com/video/TxfZ4P0jRj4/video.html Let me know if you have further questions.

This is not easy to make correctly. Get a wall flange, a rod, a pin vise and monofilament fishing line for the string. Mount the wall flange to a brick wall to act as a very rigid support to hold the rod and pin vise up. Thread the string down through the pin vise. If the support is not strong then an elliptical motion will occur instead of a straight line motion. Use a massive the pendulum bob. Start the pendulum carefully so it does not bounce. For more details read wiki.brown.edu/confluence/display/PhysicsLabs/1E20.10+Classroom+Foucault+Pendulum and also read the article published in The Physics Teacher magazine, 34th edition, pp. 238-239 (1996), “Apparatus for Teaching Physics: Classroom Foucault Pendulum”, by John E. Horne. This magazine is published by the AAPT. If you have trouble then contact me again. Good Luck!

@@GeraldZani Saludos,pero ese link que pones ya no está disponible,lo puedes volver a subir o compartir?

It is not driven. It is a long, light string and a rather heavy weight. The oscillation will damp and decay to a stop after sufficient time.

I'm pretty sure it's the temperature as well.

Well you kind of answered yourself. If space is a vacuum that means there is no helium in space. In reality you can find atoms here an there, but the only place where there are large enough quantities of helium to even go through this process are stars and gas giants. There is definitely liquid helium inside the gas giants in our solar system.

Not free floating. The space is warmer than 2k, I think, so no.

Norma Rae the cause is the relatively high heat around it

Liquid Helium has a boiling point of -452.1 F, thats why it is boiling.

In this experiment the temperature of the liquid Helium is controlled by the pressure. The pressure on the Helium is pumped until a temperature of -454.8 F (2.7 Kelvin) is achieved, which is the temperature for the lambda point transition at which the normal fluid helium I makes the transition to become the superfluid helium II. If you watch and listen to the video carefully at 11:45 the boiling in the liquid helium suddenly stops when the lambda point transition occurs. The bubbles appear because the video camera is looking through an outer dewar of outer liquid nitrogen. Let me know if you have more questions. wiki.brown.edu/confluence/display/PhysicsLabs/7A70.50+Superfluid+Helium

Because the glass container is a dewar system designed to handle this temperature.

it is made of bororsilicate glass with low coefficient of thermal expansion. the cooling is done gradually.

you won't find much of anything beyond these standard experiments. i am curious of things as well. like what if you put a block in the fluid, and put an equal block of mass, with a flat surface on flat surface, then as the layer of helium covers the one block. will the top block move? or does the 0 viscosity just coat both blocks?

Magnetic fields have been used to perform evaporative cooling of atoms after they have been cooled with lasers to create a Bose Einstein condensate.

TheEmeraldStar no pun intended? :)

@malayrojak: lol!

I thought the picture on the TV was weak. Woulda been cooler if it wasn't so fuzzy.