20100519, 15:05  #1 
"Forget I exist"
Jul 2009
Dumbassville
3×2,801 Posts 
kinetic energy
I was doing math around e=mc^2 ke=.5*m*v^2 if energy gets converted to kinetic energy in these equations, it can't convert 100% without violating the universal speed limit. can someone help explain ? I calculate .70  .71 * c as max v achievable.
Last fiddled with by science_man_88 on 20100519 at 15:13 
20100519, 16:12  #2  
"Ben"
Feb 2007
13×283 Posts 
Quote:
Read the section on relativistic kinetic energy. 

20100520, 19:04  #3 
"Forget I exist"
Jul 2009
Dumbassville
3·2,801 Posts 
see what I was thinking was e=mc^2 = 1/2mv^2
mc^2 = 1/2 mv^2 2*(mc^2) = mv^2 which worked out to sqrt(2)*c = v but anyways I'm an idiot lol 
20100521, 04:34  #4  
"Gang aft agley"
Sep 2002
2×1,877 Posts 
In addition to relativistic effects, quantum effects may also be considered at least with regards to the equipartition theorem. See http://en.wikipedia.org/wiki/Equipartition_theorem.
Quote:
http://www.physorg.com/news193581095.html Quote:
Quote:


20100522, 01:58  #5 
"Lucan"
Dec 2006
England
6474_{10} Posts 

20100522, 04:01  #6 
"Gang aft agley"
Sep 2002
2·1,877 Posts 
Of course it involves Planck's Constant and many other seminal ideas in quantum theory. I chose to mention this one thing because of Einstein's work on the photoelectric effect. The article is a bit dismissive of a thought experiment that Einstein proposed because Einstein felt that the test could never be performed and now these canny and sophisticated researchers have succeeded in performing it  so I mentioned another aspect in the protean development of quantum theory. Actually in several other was it swings back to Einstein but I wasn't trying to boost him in any way. Obviously Heisenberg, Schrodinger, Pauli, Bohr, Gamow and others must be mentioned to even begin to touch on things. Planck's Constant is a keystone in the theory. It is one of the special numbers of universe, much like the fine lattice constant. I give Feynman special credit for his simple explanation of QED that made it accessible to my level of understanding  his semiautobiographical books are a fun jaunt too. Please pardon any gaffes in my post. I am typing without consulting anything.

20100522, 04:22  #7  
"Lucan"
Dec 2006
England
2·3·13·83 Posts 
No Problems
Quote:
inscription to get an honourable mention too David 

20100522, 05:12  #8 
"Gang aft agley"
Sep 2002
2×1,877 Posts 
Cool. I didn't know of his tombstone. I like the bust too. What a pithy and powerful way to make a beautiful spot for remembrance. It puts me in mind of Archimedes' tombstone.

20100529, 04:14  #9 
Bemusing Prompter
"Danny"
Dec 2002
California
2·17·73 Posts 
Don't forget about the Lorentz factor. At relativistic velocities, the kinetic energy is:

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