Universal Gravitaional Constant?? (1 Viewer)

[Benn Portelli]

hey,

im a beginner and my spelling is really bad, but i have a question.


In the equations for most of the gravity part they refer to a universal gravitational constant 6.672x10-11 (sorry i dont know how to make it small). my question is where does this value come from? i asked my teacher but she said i didnt have to know which means she didnt know. so if anyone does know plz help me!

thanks

 

[FinalFantasy]

G is a constant of proportionality, it's a "universal constant" because it is same at all places at all times. It's the intrinsic strength of the gravitational force.

Plz correct me if im wrong

 

[Xayma]

Basically it came from empirical values found by looking at the attraction between heavy objects with which their masses were known. It is a constant, but was found empirically.

 

[el gwapo]

so it is to the power of negative 11? my substitute physics teacher said it was positive 11

 

[airie]

so it is to the power of negative 11? my substitute physics teacher said it was positive 11

lol, if it were to the power of positive 11, you won't be able to move at all

 

[twilight1412]

lol, if it were to the power of positive 11, you won't be able to move at all

actually .. we would move .... we would go splat ><
and we would feel lots of attraction to other objects ....
*imagining human magnets*

 

[alcalder]

Kind of off the topic but not really, the force of gravity is the weakest of all known fundamental forces of nature. It is SO much weaker than electro-magnetism and the weak and strong nuclear forces.

This is an enigma and one of the thoughts in the multi-layered universe theory (the one that gravity extends over all the planes of existence - multiple universes - and hence it is weak because it is so spread out. Good ol' String Theory. *shudder*)

 

[helper]

It is an experimentally determined constant that was originally measured by Cavendish
http://www.fas.harvard.edu/~scdirof.../CavendishExperiment/CavendishExperiment.html

 

[Forbidden.]

G is a constant of proportionality, it's a "universal constant" because it is same at all places at all times. It's the intrinsic strength of the gravitational force.

Plz correct me if im wrong

You know, theoretical physicists thought, if a constant would have changed, for example G (i.e Universal Gravitation Constant) in the escape velocity v² = 2GM/r, the escape velocity would change proportionally, but constants don't change.

so it is to the power of negative 11? my substitute physics teacher said it was positive 11

Well he is not a physics teacher seeming as though he IS a substitute teacher after all. If G was 6.67 x 10¹¹, we will never get off this planet and not to mention .....

lol, if it were to the power of positive 11, you won't be able to move at all

And the moment the Universal Gravitational Constant changed to 6.67 x 10¹¹, we would be binded to the heaviest adjacent objects indefinitely.
Holy shit, that's comparable to the weak nuclear force that holds some matter together.