Question

Does anyone know anything about General Relativity?

Answer 1

I know a little, but not in a technical manner

Answer 2

It is Kinda all it says is that time slows ..length changes according to your speed thats all i know

Answer 3

Hi ishaan,

What you are describing is the consequences of special relativity, which applies to inertial frames. General relativity extends this to non-inertial frames, and hence incorporates gravity. There are other consequences other than just length contraction and time dilation, one of them being the relativity of simultaneity.

Answer 4

Isn't general relativity to do with mass being a part of the function for space? As in, mass bends space-time which causes objects to move towards each other as they follow the shortest path in space-time.

Answer 5

Thats it in a nutshell really. It is a geometric theory of gravity, in that Einstein wanted to apply special relativity to all frames of reference (it is called special, as it only applies to special cases, in this instance inertial frames, i.e. frames that are not undergoing acceleration). By incorporating acceleration and hence gravity, it can be applied to all frames, and hence it becomes a General theory.

Answer 6

oh thanks jonnyMcA

Answer 7

relativity of simultaneity. ?

Answer 8

Albert Einstein knows well. Too bad, he is not available. Second best is google. lol.

Answer 9

lol

Answer 10

you forgot wiki

Answer 11

\[E = mc ^{2}\] just try out the interesting Equation editor.

Answer 12

Relativity of simultaneity means that two observers in different moving inertial frames will not agree upon the time an event will occur. For example picture a train carriage moving past a train station. In the exact middle of the train there is a device that will send out pulses of light to the front and back of the carriage.

Now to the person on the carriage, he will witness that the light will hot both the front of teh carriage and the back of the carriage at the same time. However, to the observer on the train station, he will see that the light will hit the back of the carriage before the front.

the reason for this is because the speed of light in all frames is the same. In the train station rest frame, the back of the train is heading towards the light beam, and the front is moving away, and so the back f the train will meet the light before the front. In the frame of reference of the carriage, the observer can claim he is at rest, and hence the walls of the carriage are stationary, and so the light hits both front and back at the same time.

Therefore to the two observers in different rest frames, the timings of teh events are different (if they agreed to synchronise watches by a specific event they couldn't do so). This is known as the relativity of simultaneity, in that the agreement of simultaneous events is a relative concept.

Answer 13

Zhang, your question is too general. do you have a more specific one?

Answer 14

kkgian said "Zhang, your question is too general. do you have a more specific one?". No pun intended???? ;)

Answer 15

thanks jonny

Answer 16

Isn't general relativity to do with mass being a part of the function for space? As in, mass bends space-time which causes objects to move towards each other as they follow the shortest path in space-time.

Answer 17

Thats exactly what ZhangA asked word for word. Must be an echo here. See my responses above.