Top 10 Amazing Physics Videos (Wired.com | Science) Includes some really interesting videos that I'd never seen before, the Tesla coil musical instrument is neat (No. 10), and both No. 4 and 2 videos are quite educational and good to watch. Oh, and the LHC rap video I posted earlier on the LHC thread is at No. 1 on this list
Rofl! That's brilliant.....I could watch the tesla music coil for hours.....and the mythbuster voice thing was brilliant - I'd never seen that before, I thought you could only make your voice pitch higher.
yeah I hadn't seen that Mythbusters one (then again I've missed plenty), but you're right - it never occurred to me to think about a gas that produces the opposite effect to helium
Hahaahh how farkin awesome is the musical fire And the super conducting magnets were pretty fascinating!
Thanks for the link skiplord. I didn't quite get the tesla music coil thing. Intellectually I understand what supposedly happening, but buggered if I can anything all that exciting. Were where the sparks landed meant to correspond to a particular note, or what? Not that I could see where they landed or what they were hitting, at least not on my screen. YMMV.
From the ones i have watched I thought the music came from the frequency of sparks and not where they're hitting...
To quote wikipedia: Which, as an electrical retard, I think means it is how many times per second it sparks, rather than anything to do with AC frequency or anything.
I'm no Tesla coil expert so there is probably some valid reason why they do it this way, but if it is done it via PWM then that means that the arc is being pulsed on and off at a set rate, like 41khz but you change the amount of time each individual pulse lasts (duty cycle) so you can modulate lower frequencies into the carrier frequency This wiki picture shows what it would look like
Pure rubbish, if that's the only explanation they give. I don't know how many of these old links still work: http://forums.speedlabs.org/index.php?topic=1444.0
Don't care how they do it, but the tesla coil video is awesome, theres a few on youtube from a user called voltmiester which are kinda cool
how cool would it be if he figured out how to do voice synthesis with the tesla coils ala http://au.youtube.com/watch?v=2LerE_NyYQk
Indeed - it's a pressure/temperature drop which causes the condensation. Certainly don't have to be going supersonic - you can see the effect (though not quite as spectacularly) at airshows when aircraft do high-G manoeuvres. A *more* spectacular example are the cloud-spheres you can see in footage of Pacific nuclear testing.
Thanks for the link, that page is great! I've never seen that Mythbusters one...I've seen him suck on the helium often enough, but the other stuff...I lol'd!
That superfluid thing was really interesting... How exactly does it flow out of the cup though because it has 0 viscosity? Does it latch onto the glass and continue to spread up or something? Little bit lost here ...
I think your correct on that count with the super fluidity, the only other option is that it somehow seeps through the bottom of the beaker but I would have thought that the amorphous nature of glass would make that very unlikely. Very curious to know the answer as well
Maybe not as technical as some of those videos, but this video of a non-newtonian fluid a lecturer showed my class last year was pretty cool. http://www.youtube.com/watch?v=f2XQ97XHjVw
I dont understand why a superliquid will have the 'urge' to climb out of a beaker even if its viscosity is 0?
It's not climbing, it's wanting to lay itself out to an atom's thickness (no viscosity, no surface tension, no friction between the superfluid and vessel wall) As for dripping out - think of heat as vibrating atoms. At 2 degrees above absolute zero most of the vibration is gone, and with zero viscosity it's easily able to slip through porous containers (video quote - "unglazed ceramic bottom").
The zero gravity water sphere ones remind me of a NASA video where they have a guy popping a water bomb in a diving aircraft (zero gravity).
