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Engineering too :3

what is gravity?

i don't really understand it.

As a requirement i completed 3 credits of physics one year ago

Ive forgotten everything

jugo wrote:what is gravity?

i don't really understand it.

noone does

jugo wrote:what is gravity?

i don't really understand it.

No one really does. Effectively the only concrete thing we know about it is that it manifests as an attractive force that is dependent on mass. The mechanism for the transmission of this force is still up for grabs although Einstein's theory that it is due to the deformation of spacetime by masses works pretty well for predictions. Another theoretical explanation is that it originates from a source outside of our universe (which in that theory exists as a brane in a larger universe of branes).

good answer - thanks.

another thing i don't get is what happens inside a black hole?

the same as would happen to you if you went inside any other colour hole you racist fuck

jugo wrote:good answer - thanks.

another thing i don't get is what happens inside a black hole?

Another question no one knows the answer to. Current theory suggests that everything within a black hole is infinitely compressed. However there is the viewpoint that infinities in physics only appear when we do not have a sufficiently good model of what's going on.

It used to be thought that nothing can escape from a black hole. Which meant that information was lost. However it's now generally accepted that black holes can effectively evaporate due to quantum fluctuations at their boundaries. This now means that meant that black holes were no longer complete sinkholes. But the problem with this is that the quantum fluctuations should not be able to communicate with what's inside a black hole. Which means that what's evaporating from the black hole has nothing to do with what's inside it. Which means we are still losing information. Unless information is still encoded in some way in the infinitesimal structure of the black hole and iss able to affect these quantum fluctuations somehow. They're still scratching their heads on this

I might not have phrased that last bit very well. Typing on a train does not seem conducive to thinking clearly

kay wrote:Current theory suggests that everything within a black hole is infinitely compressed.

so skrillex has a black hole in his studio?

big

these are two questions no physicist truly knows the answer to. black holes contain a spacetime singularity at the very center.. so we can't really understand a black hole without also understanding the nature of singularities..which we don't.

to answer your question in layman's terms without getting into hawking radiation *ahem ahem kay*
there are massive tidal forces at work once inside. the force of gravity at your feet would be different then your head, so you'd simply be stretched apart like spaghetti

.

LACE wrote:these are two questions no physicist truly knows the answer to. black holes contain a spacetime singularity at the very center.. so we can't really understand a black hole without also understanding the nature of singularities..which we don't.

to answer your question in layman's terms without getting into hawking radiation *ahem ahem kay*
there are massive tidal forces at work once inside. the force of gravity at your feet would be different then your head, so you'd simply be stretched apart like spaghetti

Sowwy!

Tbf he did ask what goes on in a black hole, not what happens to you when you fall into one...

volcanogeorge wrote: so skrillex has a black hole in his studio?

big

apparently if you buy him a pack of cigarettes he shows it to ya.

kay wrote:

LACE wrote:these are two questions no physicist truly knows the answer to. black holes contain a spacetime singularity at the very center.. so we can't really understand a black hole without also understanding the nature of singularities..which we don't.

to answer your question in layman's terms without getting into hawking radiation *ahem ahem kay*
there are massive tidal forces at work once inside. the force of gravity at your feet would be different then your head, so you'd simply be stretched apart like spaghetti

Sowwy!

Tbf he did ask what goes on in a black hole, not what happens to you when you fall into one...

hmm, maybe they did want to go there.
i'm so used to the generic ''what happens when you're inside a black hole????'' q. haha

I'm no student of any science but I'm seriously into my science, especially the science of physics and astrophysics. I absolutely love space, it's like porn to me I swear. Been reading into it lots lately.

Something everyone in here may want to watch is the recent Brian Cox documentary Wonders of Life. It's very, very interesting, although some parts lost me quite easily - found myself rewinding and re-watching some parts to try and better grasp the details. It's all about how the science of physics affects life in its various forms.

One of the things that I've been reading about that I've been finding difficult to get my head around are pulsars. I've read that they can spin at up to 716 times per second (http://en.wikipedia.org/wiki/PSR_B1937_plus_21)... Compare that to earth that (obviously) spins only once every 24 hours... It's unimaginable, and assuming that they are actually neutron stars, that's an object roughly the size of Brooklyn, New York, weighing as much as up to 3 of our solar systems, spinning 716 times every second... I just...

LACE wrote:

kay wrote:

LACE wrote:these are two questions no physicist truly knows the answer to. black holes contain a spacetime singularity at the very center.. so we can't really understand a black hole without also understanding the nature of singularities..which we don't.

to answer your question in layman's terms without getting into hawking radiation *ahem ahem kay*
there are massive tidal forces at work once inside. the force of gravity at your feet would be different then your head, so you'd simply be stretched apart like spaghetti

Sowwy!

Tbf he did ask what goes on in a black hole, not what happens to you when you fall into one...

hmm, maybe they did want to go there.
i'm so used to the generic ''what happens when you're inside a black hole????'' q. haha

Yeah I almost went for the spaghetti response too

Unwind, which aspects of wonders of life did you have difficulty with? Life as an energy input process to temporarily impose otder against the natural tendency of the universe to slide towards disorder? Maybe we can try to help explain.

what happened before the big bang?

physics major

only in my second semester though so not really fun yet

Phigure wrote:physics major

only in my second semester though so not really fun yet

Have fun crying yourself to sleep during finals.