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Gravity and Centrifugal Force do exist!

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John Jackson

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Re: Gravity and Centrifugal Force do exist!
« Reply #150 on: February 10, 2008, 12:04:05 AM »
The masses of the celestial bodies. Not all curved paths are geodesics.
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TheEngineer

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Re: Gravity and Centrifugal Force do exist!
« Reply #151 on: February 10, 2008, 12:06:20 AM »
How is the mass doing it?  Is it reaching out and grabbing it?
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fshy94

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Re: Gravity and Centrifugal Force do exist!
« Reply #152 on: February 10, 2008, 12:07:54 AM »
Sorry, but engy's right. Massenergy curves spacetime; mass doesn't have invisible sticky hands to reach out to one another.

And geodesic is the correct term. You can probably find the term on wiki.
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John Jackson

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Re: Gravity and Centrifugal Force do exist!
« Reply #153 on: February 10, 2008, 12:08:38 AM »
In a similar way one charge is repelling or atracting another charges. The difference is, mass creates gravitational field around it. Gravitational field is described by the metric tensor in GR. Geodesics are the lines of smallest "length" between two points in space-time.
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TheEngineer

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Re: Gravity and Centrifugal Force do exist!
« Reply #154 on: February 10, 2008, 12:11:25 AM »
But you said that light does not follow geodesics..
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John Jackson

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Re: Gravity and Centrifugal Force do exist!
« Reply #155 on: February 10, 2008, 12:12:18 AM »
Quote from: TheEngineer on February 10, 2008, 12:11:25 AM
But you said that light does not follow geodesics..

It does not. I was simply explaining to you what geodesics really are.
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TheEngineer

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Re: Gravity and Centrifugal Force do exist!
« Reply #156 on: February 10, 2008, 12:13:07 AM »
So, then how does light bend around a massive body?
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John Jackson

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Re: Gravity and Centrifugal Force do exist!
« Reply #157 on: February 10, 2008, 12:13:31 AM »
Principle of Ferma.
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TheEngineer

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Re: Gravity and Centrifugal Force do exist!
« Reply #158 on: February 10, 2008, 12:16:48 AM »
Quote from: TheEngineer on February 10, 2008, 12:13:07 AM
So, then how does light bend around a massive body?
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John Jackson

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Re: Gravity and Centrifugal Force do exist!
« Reply #159 on: February 10, 2008, 12:17:39 AM »
Quote from: TheEngineer on February 10, 2008, 12:16:48 AM
Quote from: TheEngineer on February 10, 2008, 12:13:07 AM
So, then how does light bend around a massive body?

Quote from: John Jackson on February 10, 2008, 12:13:31 AM
Principle of Ferma.

Sorry to disturb your narrow mind, but it's true.
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TheEngineer

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Re: Gravity and Centrifugal Force do exist!
« Reply #160 on: February 10, 2008, 12:20:23 AM »
Sorry to destroy what knowledge you thought you had about GR, but like I said, geodesics.

Now, how about you answer the other questions?  You can answer them, right?
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John Jackson

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Re: Gravity and Centrifugal Force do exist!
« Reply #161 on: February 10, 2008, 12:23:03 AM »
Light follows that path in space that is consistent with the Principle of Ferma. That line is not identical to a space geodesic in constant gravitational fields.

The reason:

THE MATH SAYS SO.
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TheEngineer

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Re: Gravity and Centrifugal Force do exist!
« Reply #162 on: February 10, 2008, 12:24:53 AM »
Right, it follows a null geodesic. 

The reason:

THE MATH SAYS SO.
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John Jackson

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Re: Gravity and Centrifugal Force do exist!
« Reply #163 on: February 10, 2008, 12:25:53 AM »
No:

WIKIPEDIA SAYS SO.
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TheEngineer

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Re: Gravity and Centrifugal Force do exist!
« Reply #164 on: February 10, 2008, 12:26:43 AM »
Wiki says what?



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John Jackson

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Re: Gravity and Centrifugal Force do exist!
« Reply #165 on: February 10, 2008, 12:27:21 AM »
That you're ignorant?
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TheEngineer

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Re: Gravity and Centrifugal Force do exist!
« Reply #166 on: February 10, 2008, 12:29:29 AM »
Again, the irony is thick. 

Again, I am still waiting for your answers to the other questions.
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John Jackson

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Re: Gravity and Centrifugal Force do exist!
« Reply #167 on: February 10, 2008, 12:33:24 AM »
Remember the field equation I have posted in this thread. For a pure EM field, T = Tii = 0. That means the scalar curvature of space-time R is also zero.
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TheEngineer

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Re: Gravity and Centrifugal Force do exist!
« Reply #168 on: February 10, 2008, 12:34:43 AM »
And?
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John Jackson

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Re: Gravity and Centrifugal Force do exist!
« Reply #169 on: February 10, 2008, 12:39:39 AM »
This is not the case when matter with rest mass diferent from zero is present at that point.
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TheEngineer

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Re: Gravity and Centrifugal Force do exist!
« Reply #170 on: February 10, 2008, 12:41:11 AM »
And?
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"I haven't been wrong since 1961, when I thought I made a mistake."
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John Jackson

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Re: Gravity and Centrifugal Force do exist!
« Reply #171 on: February 10, 2008, 12:45:08 AM »
Quote from: John Jackson on February 09, 2008, 10:57:04 PM
Quote from: TheEngineer on February 09, 2008, 10:55:01 PM
What about bodies without mass?  Why do you leave them out of having gravity?

What bodies would those be?


Quote from: TheEngineer on February 09, 2008, 10:58:53 PM
Photons and gluons.

Oh, how could I have missed that. Your ignorance is obvious.
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TheEngineer

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Re: Gravity and Centrifugal Force do exist!
« Reply #172 on: February 10, 2008, 12:50:18 AM »
What is incorrect about that?
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John Jackson

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Re: Gravity and Centrifugal Force do exist!
« Reply #173 on: February 10, 2008, 12:51:00 AM »
Quote from: TheEngineer on February 10, 2008, 12:50:18 AM
What is incorrect about that?

You enumerated gluons as particles with zero rest mass, dummy.
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TheEngineer

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Re: Gravity and Centrifugal Force do exist!
« Reply #174 on: February 10, 2008, 12:52:45 AM »
What is the mass of a gluon?
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John Jackson

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Re: Gravity and Centrifugal Force do exist!
« Reply #175 on: February 10, 2008, 12:53:28 AM »
Quote from: TheEngineer on February 10, 2008, 12:52:45 AM
What is the mass of a gluon?

greater than your IQ, when expressed in MeV.  :-*
« Last Edit: February 10, 2008, 12:55:01 AM by John Jackson »
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TheEngineer

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Re: Gravity and Centrifugal Force do exist!
« Reply #176 on: February 10, 2008, 12:55:49 AM »
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John Jackson

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Re: Gravity and Centrifugal Force do exist!
« Reply #177 on: February 10, 2008, 12:56:21 AM »
 ;D
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TheEngineer

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Re: Gravity and Centrifugal Force do exist!
« Reply #178 on: February 10, 2008, 12:59:12 AM »
Just as I thought.  You think you are clever, but you are just ignorant.  You have no idea what you are talking about but you keep on.  That's fine.  You are not the first to take this approach, and you will definitely not be the last.
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Roundy the Truthinessist

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Re: Gravity and Centrifugal Force do exist!
« Reply #179 on: February 10, 2008, 01:02:25 AM »
LOL.  Now JJ's trying to participate in the debate.  :D

I love it when Engy spars with some clueless noob who assumes that Engy doesn't know what he's talking about.  It makes me feel all warm and fuzzy inside.
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Quote from: wise on August 21, 2018, 11:47:45 PM
Where did you educate the biology, in toulet?
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