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/sci/ - Science & Math

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1163210 No.1163210 [Reply] [Original]

/sci/, what is the speed of gravity?
More specifically, if I created some mass, would the affect of it's gravity be felt everywhere instantly?

If it directly affects spacetime, then does that mean it doesn't have a speed?

>> No.1163215

Gravity waves propagate at the speed of light.

>> No.1163227

>>1163215
Okay. Thanks.

>> No.1163236

1. Drop two rocks of different mass from the Tower of Pisa.
2. Calculate rate of droppage.
3. PROFIT!

>> No.1163245

>>1163236
Not what I asked.

>> No.1163246

>>1163236

>Rate of droppage.
Derp.

>> No.1163302

>>1163215
>>1163210
But how fucking cool would it be if it was instantaneous?

That being said, how do you test something like this? Would you just move a mass quickly and see how long it takes to affect another mass with the decreased distance between the two?

>> No.1163344

Here you go!

>> No.1163347

Its has the speed of light wich is 3*10^8 m/s aprox.

>> No.1163350

>>1163344
Oops. I mean, here you go.
http://news.bbc.co.uk/2/hi/science/nature/2639043.stm

>> No.1163354

Gravity is a characteristic of matter. It is instant in a sense.

>> No.1163388

1. Speed of light.
2. Technically you can't create mass, so you should ask what happens if you suddenly move the mass.

>> No.1163403

>>1163388
Well, you can... Theoretically. If you get a bunch of energy in one area, that creates mass.

>> No.1163414

Dumb question, but gravity isn't an electromagnetic wave. So how do we know it propagates at "c"?

>> No.1163415

>>1163403
Energy is what gravitates. (Well, also, pressure and momentum affect gravity.) So to be more accurate, I should have said that you can't create energy.

>> No.1163410

>>1163354
no its not
stop spreading bullshit when you obviously know nothing about the subject

>> No.1163427

>>1163414
short answer: relativity

>> No.1163431

>>1163414
It propagates at a velocity of 1 (called c in unenlightened unit systems which use different units for distance and time). That velocity has nothing to do with light except for the fact that everything massless moves with velocity 1, so light moves with velocity 1.

>> No.1163438

>>1163415
Oh. I see.

So, let's say you were going at relativistic speeds. That would increase your mass, because you have more energy?

>> No.1163440

>>1163414
some guys tested the speed at which gravity waves propagate and found out that it was c

not like they know why, though

>> No.1163451
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1163451

>>1163350
>If gravity travelled at the speed of light it would mean that if the Sun suddenly vanished from the Solar System, the Earth would remain in orbit for about eight minutes

>> No.1163466

>>1163210
Its the "propogation of the graviton", which travels at a maximum speed of c

>> No.1163478

>>1163438
im not him but:
as far as i know, no
relativistic mass is usually not used by scientist and the conversion of energy to mass is more complicated than just giving matter energy, its about breaking and forming strong interactions (nuclear)

>> No.1163486

>>1163350
If they were using light (from a quasar) to measure the effects of gravity (from Jupiter in relation to it) wouldn't the effects appear to be happening at the speed of light because of the speed of the light being observed, and not necessarily the gravity?

>> No.1163518

>>1163486
we would observe the effects happening at the speed of light AND the interaction would be happening at the speed of light so if there was a time dilation of lets say 5 seconds between our observations and the effects taking place and 10 seconds between the occurrence and effect of gravitation to take place it would in total take 15 seconds

so, both

>> No.1163521

>>1163451
>implying the earth wouldn't remain in orbit indefinitely due to law of inertia

>> No.1163527

>>1163246
can find this by knowing the % chance each pigeon has off dropping droppings

>> No.1163530

>>1163521
>implying you know what inertia means
learn some physics and get back to /v/
it would start moving in a straight line (assuming there aren't any other strong gravitational effects) since there's no force (gravitational pull in this case) applied

>> No.1163532

>>1163521
holy shit you're a retard

>> No.1163550

>>1163438
In general, you need to use Einstein's field equations to calculate the gravity of an object. You can't just find a mass to plug into the old Newtonian formula.

>> No.1163552

>>1163521
>Implying inertia works that way

:x If you had a ball, and you placed in a spiral loop, once it exits the loop, do you think it continues to move in circles?

>> No.1163559

If gravity is a wave, does gravity interferometry exist?
That is, could two gravity waves interfere with each other?

>> No.1163572

>>1163559
Yes, they are waves, so they can interfere with each other.

>> No.1163578

>>1163559
>>1163572
Of course, whether I'd say "gravity interferometry exists" is a different question because we haven't detected gravity waves yet. But it is possible in theory.

>> No.1163589

>>1163572
wat
really?
ive never heard of this before, can you provide a link so i can read about it?

>> No.1163641

>>1163589
okay ive googled it and haven't found any satisfactory results except for a few hypothesis so im guessing there's no such info right now

>> No.1163647

I love how we know next to shit about gravity,

On a related note, one of my favorite things to tell people who deny evolution is that gravity is a theory, why don't they try jumping off a bridge?

That being said, evolution is probably one of the most robust theories science has to offer.

>> No.1163659

>>1163647
>That being said, evolution is probably one of the most robust theories science has to offer.
wow i bet you know a lot about evolution

>> No.1163665

>>1163530
>>1163532
>>1163552

Y'all niggas etc. I know (and I'd hope everyone on this board knows) that if the centripetal force is removed the object will continue on a straight line tangent to the circular path it was following.

>> No.1163666

How can the correct answer be given to OP on the first fucking response and yet this shitstorm follows?

>> No.1163682

>>1163666
oh hi welcome to 4chan
>>1163665
then why the fuck did you post a stupid ass comment like that fucktard
>inb4 i trol u lolololol

>> No.1163785

>>1163682
"Y'all niggas etc." was a reference to the "y'all niggas posting in a troll thread" pic that I used to indicate I was trolling.

>> No.1163802

his hair looks like dicks xD

>> No.1163809

>>1163785
which brings us back to lololol i trol u
no you didnt
if you had, then what the fuck would be the point of coming out and SAYING you trolled people

enough, let the thread die in peace

>> No.1163835

9.81 meters per second squared

fucking noobs man

>> No.1163836

9.81 meters per second squared

fucking noobs man

>> No.1164278

>>1163836
are you fucking retarded?

god! I have never seen so much fail in my entire life!