Re: Big Bang !
we must not allow a doomsday gap!
Steve Jobs has ruined this joke.
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Imperial Forum → General → Big Bang !
we must not allow a doomsday gap!
They will probably let in creatures from another dimenson like in The Mist ![]()
whats this im reading about light travelling faster than C?
is that even possible?
Hurrah for Dr.Lateralis (in spe) ![]()
@ UWS
"Information" cannot propogate at a velocity faster than c. That means photons in a vacuum are constrained to move at c. However, there are two velocities when it comes to the propogation of any wave - the phase and group velocities. The phase velocity can be anything you like, but the group velocity - the velocity at which the energy is transported through space - for light in a vacuum is fixed at c.
Of course, the group velocity can be slower than c. For instance, light travels through glass at something like 0.75c. The slowest group velocity of photons through any medium? Cool sodium down to about 2K and the group velocity falls to a very pedestrian 38mph.
*hugs Wouter!*
Ahh
Maybe they'll create little humans!!
Midgets? ![]()
Yes!!! little humans!! like the size of a grasshopper!!
we can train them to be saboteurs!!
![]()
and they can live with ken and barbie in their house and be the baby ![]()
ah jeez, I will go get some proofs... since our physics people are still not graduated to the smart phase of the university, how bout dem apples by the way?
Not graduated to the smart part of physics yet?
Both SD and I have graduated from a university comparable to Oxford and Cambridge and I'm mid way through a PhD... in physics. The only person out of us three to have not passed to the smart part of physics yet, is yourself.
Try as you might, "Einstein", you know very little of theoretical physics and so cannot convince even the laymen in this thread that you know what you're talking about. On the other hand, I have several mathematical proofs for the work of Einstein, Schrodinger, Born, Planck and others, both in my undergraduate notes and in various texts books.
FInally, you're offer of getting "proofs" means nothing to me. I suspect it means just as little to any one else, since you always promise things and fail to produce anything of substance (and frequently fail to prove anything at all).
The only person out of us three to have not passed to the smart part of physics yet, is yourself.
/ME giggles
I love you Lat ![]()
I want to have your babies Lat, I l0v3 you soo much...
btw Wikipedia proves Flint wrong anyway... Who would listen to someone who claims that something 2nd year EEE Students come up with all the time is his own idea or could work, something 3rd years know...
I wrote that wikipedia entry and I haven't even ever taken a physics class.
Anyways since this thread is here and we have such educated people conversing here I would like to digress a bit and ask a couple of things that i have been wondering in regards to physics.
1. I dont know where I got it but I always thought that black holes are basically a collection of super dense matter. since this collection of matter is so dense, it has an incredibly powerful gravitational field. that field is so strong that it pulls other matter to it and adding that matter to its mass thus perpetuating the cycle. also, the field is so strong that it even has the ability to pull photons into itself and this is why we call them black holes because the light doesn't escape the gravitational pull and isnt reflected back for us to see.
I have seen on Nova that Einstein theorizes that black holes are really holes (the way I understood it was that they are kinda like the way that I perceive wormholes) and on the other side is a white hole (I dont remember what it was called but it was basically like a hole with stuff shooting out). what is your take on both of these theories?
2. since black holes suck in photons doesnt that mean that they have mass. this is because of the way that i understand that a black holes mechanics depends on gravity and gravity depends on mass.
3. do you know of any type of material that blocks a magnetic field? This material should also block the field on its own and never loose its ability to block it, at room temperature.
oh yea and this material cant be effected by the magnet (either by being attracted or repelled).
"2. since black holes suck in photons doesnt that mean that they have mass. this is because of the way that i understand that a black holes mechanics depends on gravity and gravity depends on mass."
I'm not sure on this one but i believe the gravitational field influences the electromagnetic field the light travels in.
So the electromagnetic field gets "bent" towards the black hole and the light gets sucked in. Someone correct me if i'm wrong ![]()
so its two forces that we dont understand the mechanics of at work... ![]()
Question 1:
To a point, yes. Black holes can be formed in a variety of ways, but ultimately, a black hole is just where the local enery density is sufficient to curve space time to such extremes that everything - including photons - that happens to pass across the event horizon are trapped forever. (*) One way a black hole can be formed is by the inward collapse of giant star once it has no fusionable material left. For instance, a star with a mass over about 2 solar masses (the exact number is not well known, as the physics of the hot, dense matter needed for black hole creation are not well understood) has enough gravitational energy to overcome the neutron degeneracy pressure in neutron stars and carry on collapsing indefinitely. However, as mass and energy are two sides of the same coin - in much the same way particles and waves are manifestations of the same underlying physical phenomena - then if you have a large enough energy density you can create a black hole. It is this fact which has caused so many people to worry about the LHC project, but such has been the misreporting of information and reporting of disinformation that panic has spread and law suits against the LHC filed. In fact, some woman in India committed suicide, such was her conviction the world was going to end. Its at times like this I really hate the media and wish I was scientific correspondent. ![]()
Now, there is a twist to this story. Although black holes can suck in matter and photons, there is a process known as Hawking radiation. It uses a relativistic quantum mechanical process which is well known, understood and experimentally observed, whereby particle-anti-particle pairs can, for a short time, appear out of nowhere before annihilating each other. The time these particles exist in space is governed by the mass-energy inequality: h =< delta-E
Give that lubber a tag point.
I went out today an' bought "Physics for dummies" ![]()
Do you know if the process of bombarding a noble gas with microwaves produces heat. (I was under the impression that for microwaves to produce heat they need to do it with water or hydrocarbons.
so on a side note the materials that are being sold as magnetic shielding are more than likely in my humble understanding, some type of ferrous material that basically is just attracted to the field and thus spreading that magnetic field out onto a greater surface and minimizing it through having the same power but weaker in the area that the magnet is located.
I like a million other Internet people have become fascinated with magnets and have spent a good percentage of my income on a huge assortment of neodymium magnets. I have also spent alot of time making electromagnets of varying shapes, sizes, and powers. There are alot of things that I just cant seem to wrap my head around or find answers to because as I understand it there really is no answer to exactly what it is in these materials that is creating these fields or why they work. what sources would you recommend to get a layman's explanation so I can better understand the science behind the scenes?
oh yea, and I just wanted to brag in case anyone cares I finally built a pretty decent Tesla coil and a vandergraff generator. ![]()
WUTEVA ye physicists cant even tell if a cat is dead or not
I think that th' answer a physicist would give is that ye cant even tell if that cat dead because maybe ye arent even really here...or...thar.
J/K I watch too much Nova
I'm just off to bed, so I'll make this post quite brief.
In order for any electromagnetic radiation t' heat anythin', thar needs t' be some kind o' (electronic or vibrational) transition or absorption process available. Water molecules have vibrational modes that be easily excited by microwaves - hence their use in cookin'. The same (likely) wouldn't work fer noble gasses. As no noble gas can form a molecule with anythin', th' only important energies fer EM radiation absorption be th' energies o' th' electronic states, ya bilge rat! Most noble gasses emit light in th' visible spectrum so microwaves won't work.
As fer magnetic shieldin', I've no nay ne'er really thought about it in any great depth, but thar be some pieces o' kit in th' labs in our group which uses magnetic shieldin' fer high resolution electronic spectroscopy experiments, and a bucket o' chum. I may just have t' look up what they be made o'.
As fer th' magnetic properties o' solids... Well, a book by Steve Blundell is what I an' scallywags in th' superconductivity an' magnetism group use in our department. How accessible it is t' th' lay, I'm not sure. The problem with magnetism is that ye approach it from two different directions: statistical thermal physics an' quantum mechanics. I may be able t' get across th' key points if I were given enough time t' write somethin', but if ye wanted t' fully understan' th' underlyin' physics, maths an' all, well, that would take ye about 2-3 years o' a university degree. ![]()
Ah cock-knobs. Posted after midnight, an' now everythin' is in "Pirateish", and a bucket o' chum. Oh well. ![]()
did ye just call me a bilge rat, Dance the Hempen Jig
P.S. ye can get past th' pirate talk by typin' anythin' in an' then hittin' edit, an' deletin' what ye typed an' then write what ye want t' say in th' edit mode an' it wont be re-written in pirate.
what does a bucket o' chum an' scallywags have t' do with th' Big Bang theory, Get out of me rum! ![]()
GENEVA - The world's largest atom smasher
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