Energy equation

  • Thread starter scott_sieger
  • Start date

scott_sieger

Hi guys,

Just a provocative thought.

It i said that a good theory for everything must be true in all circumstances.

So, Why does e=mc^2 fail in this regard?
 

Integral

Staff Emeritus
Science Advisor
Gold Member
7,185
55
1+1=2 is also true in all circumstances, but it is not a theory of everything. E=mc2 was derived from Einstein using the Theory of Special Relativity. It is simply a result, it is not a theory.
 
354
0
When is e=mc^2 not true?
 
Last edited:
82
0
When is e=mc^2 not true?
As Intergral said, e=mc^2 is a result of a theory and not a theory itself. Other results of General Relativity predicted its own downfall, particularly the Bing Bang, blackholes and singularities. The rules of General and Special Relativity break down in those areas and other tools are needed to understand them. Quantum Mechanics was developed to help understand these things that General Relativity could not.

It alone doesn't implicitly say that energy and mass are the same thing, merely that if you perfectly convert a mass m to energy, you'll get mc^2 worth of Joules.
I believe the equation does implicitly say that energy and mass are different ways of looking at the same thing.

Remember those toys called “Transformers” we all knew it was a truck, and also a robot in disguise.

S
 
354
0
Oh yeah, black holes, always forget about those...
On the second point you made, I apparently made an edit while you where typing your reply, because I realized your point myself, but of course it was only after I hit 'Submit'. Good example though, gotta remember that one.
 
3,073
3
E=mc2 is violated within virtual interactions according to Heisenberg's uncertainty principle, where [del]E[del]t<h/(4[pi]).
 
17
0
Loren, isn't that just a violation of energy conservation? I mean, on a short timescale there is energy that "appears" for virtual interactions as you say, but that is a violation of energy conservation. E=mc^2 more appropriately is interpreted as energy and mass have the same effect on space-time and I don't think anyone says that the temporary energy on the uncertainty time-scale "does not" have the same effect on space-time as mass would...therefore E=mc^2 would not be broken.
 

scott_sieger

another test of energy equation

Excuse my ignorance as I am no mathamaticion in fact I didn't even pass Highschool.

But I am under the impression that for a formula to be true it has to be able to be inverted.

So, if e=mc^2 what does anti- energy/matter equal. How would you write an inversion of this equation? Me thinks we can't. Therefore another equation is needed to describe energy and anti-energy. And then that equation would hold true regardless of black holes or other.

Please tell me if my approach is wrong.
 
354
0
I think so, it's more of a rule of thumb and applies in mechanics, etc..
 
3,073
3
Zimm,

You may be right, that E=mc2 is a physical principle unaffected by (but often appearing in) the HUP, if [del]E=[del]mc2 for all [del]E and [del]m. Regrets.

Scott,

Photons (energy) are their own antiparticle, thus the conversion of matter or antimatter to energy is indistinguishable.
 

Related Threads for: Energy equation

Replies
3
Views
2K
  • Posted
Replies
2
Views
3K
  • Posted
Replies
2
Views
2K
  • Posted
Replies
2
Views
1K
  • Posted
Replies
2
Views
2K
  • Posted
Replies
1
Views
3K
  • Posted
Replies
2
Views
2K
Replies
5
Views
1K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top