/sci/ - Science & Math

For a while now I have been trying to understand the concept of space-time and it hasn't quite clicked. If I could get your interpretation or how it clicked for you, it would help a lot.

What would happen if you took away the all the gravity on earth for 5 minutes?

Why is inertial mass equal to gravitational mass?

Hey people,
I saw a demonstration to calculate the metric on a 3D-spheric universe which started with the use of a 4D-sphere.
Does anyone know this demonstration and could explain it to me?

Is it possible to move "backwards" through space, i.e. have negative velocity?

So, a long time ago in Uni I learned about relativistic forward time travel. That knowledge has long since left my brain. Can someone please explain it to me. I remember the general concept of time dilation but other than that I'm ignorant.

/sci/

I have a few questions that I bet have been asked a thousand times before on this board but Im curious and you guys give the best answers

1. Can gravity bend gravity like it bends spacetime?

2. How are photons related to the electromagnetic force and the photons we see as visible light?

3. how do gravitons 'bend' spacetime? (is this simply a property they have or can this be explained in depth)?

4. What is the purpose of a capacitor?

5. Talk to me about the event horizon?

I know you guys (& gals?) love explaining this stuff and I love to listen... longtime lurker on this board

Thanks alot guys... Much gratitude on my part

Why doesn't electromagnetic radiation need a medium to move through like a sound wave does? Does this imply that a radio wave is actually a particle?

Since spacetime is a real thing, couldn't you define an absolute reference frame with respect to all of spacetime, thus contradicting the principle of relativity?

Hello /sci/.
Someone on /x/ linked this video disproving spacetime. I came here to ask you is it legit? Has the guy a good argument when he says coordinates and dimensions are inconsistent in mathematics?

https://www.youtube.com/watch?v=9Q9IePuHut4

Actually, lets expand this to scientific concepts in general.

>Like Wormholes.
http://www.krioma.net/articles/Bridge%20Theory/Einstein%20Rosen%20Bridge.htm

how much of this kind of stuff do you see humanity making advances in in the next 100 years?

If you assume gravitons don't exist, what mechanism causes spacetime curvature?

I don't understand space. Like at all. I can't imagine it. if the earth rests on the grid of space then how come there's planets existing faraway under it. Why does the moon travel along the edge of the space grid? Why it doesn't fall down on earth?

Why are inertial mass and gravitational mass the same?

I need some help. I can't Figure out the theory of relativity to save my life. Can any of you help explain it to me?

Wasn't this trying to explain gravity with gravity?

Why is space-time curved? The most logical thing would be that everything wants to "big crunch" in order to get to the origin of things which lies in the microcosmos.

There, I think I kinda solved the meaning of everything. I have paypal btw.

Can someone explain, extremely concisely, what the general theory of relativity is all about?

I think I understand it, but it seems so simple in words.
My basic understanding is that objects with large mass can bend this abstract "fabric", and the larger the mass/density of anything on it exerts equal warping of this "fabric".
I don't get why E=MC^2 was so revolutionary. Because energy can be translated to mass? And what is C, for that matter?

Spacetime.

okay so space-time

its like if you put a bowling ball on a trampoline right? the trampoline is a 2-dimensional analogy of space-time and the bowling ball "pushes" space-time into the 3rd-dimension.

so in reality space-time is 3-dimensional and massive objects push space-time "down" into the 4th-dimension?

am i thinking this right? or am i wrong?

Can somebody teach me (a mathematical retard) the theory of relativity in one post?

http://en.wikipedia.org/wiki/Spacetime

"In relativistic contexts, ... time cannot be separated from the three dimensions of space, because the observed rate at which time passes for an object depends on the object's velocity relative to the observer and also on the strength of intense gravitational fields, which can slow the passage of time."

>>2252506
Yes. Space-time is curved which creates gravity. It takes light 8 minutes from the sun to reach the Earth. What does this mean? If the sun randomly disappeared, then it would take 8 minutes for us to actually see the effect.

Welcome to relativity.