E=mc² is wrong?

From YT: It's the most famous science equation in history... but E=mc² is not technically correct.
siftbotsays...

Promoting this video and sending it back into the queue for one more try; last queued Wednesday, November 10th, 2010 11:30am PST - promote requested by kulpims.

Adding video to channels (Talks) - requested by kulpims.

harrysays...

Whoah.. That last bit is interesting. Taking the square root of the E4 equation allows for negative energy, purely by simple mathematics. And then it turns out that there IS such a thing as negative energy by way of positrons.

One question they didn't really answer in this bit: why is the factor the speed of light squared? Besides it being a result of the maths, what does that relationship actually mean?

TheGenksays...

>> ^harry:

One question they didn't really answer in this bit: why is the factor the speed of light squared? Besides it being a result of the maths, what does that relationship actually mean?

I guess it has something to do with double rainbows </meme>

ajkidosays...

>> ^harry:
One question they didn't really answer in this bit: why is the factor the speed of light squared? Besides it being a result of the maths, what does that relationship actually mean?


I think it comes from the Lorentz factor y = 1 / sqrt(1 - v^2 / c^2)

And why the speed of light is in the Lorentz factor is another story. I guess Feynman was spot on in that magnet video...

Paybacksays...

>> ^honkeytonk73:
They should look for the Jesus particle. Not only the God particle. I suppose there is also a Muhammad, a Buddha and a Xenu particle too.


Yeah, but the Xenu particle goes around talking shit about the other particles and uses embarrassing gluons it stole from well-known molecules that were edited by its brainwashed quarks.

honkeytonk73says...

>> ^Payback:

>> ^honkeytonk73:
They should look for the Jesus particle. Not only the God particle. I suppose there is also a Muhammad, a Buddha and a Xenu particle too.

Yeah, but the Xenu particle goes around talking shit about the other particles and uses embarrassing gluons it stole from well-known molecules that were edited by its brainwashed quarks.


Could very well be! Maybe the 'body thetans' stick to us via gluons after they get blown up by hydrogen bombs in volcanoes! We may just be on to something! Or.. ON SOMETHING. Yeah. Maybe that is it.

Mashikisays...

The theory has been known to be wrong for awhile especially when dealing with gravity and non-consents. It's still right for a lot of stuff. But this is pretty interesting.

Friesiansays...

Ahhh, this takes me back to my physics lessons at school where we would talk about this with our teacher - who incidentally was not only a brilliant man, but also looked like Big Vern from Viz!

direpicklesays...

Since it's never actually mentioned in the video: You can write a more correct equation (though E^2 = m^2*c^4 + p^2*c^2 is still the most correct) as E = mc^2 = y*m0*c^2 where m is the 'relativistic mass' m0 * y, with m0 the mass of the object at rest and y = 1/sqrt(1-v^2/c^2) as mentioned above. This doesn't allow for an easy inclusion of light and such, though, so the E^2 equation is nicer.

Lawdeedawsays...

>> ^rottenseed:
>> ^sillma:
>> ^rottenseed:
This is more chemistry/physics

Those are just applications of mathematics.

But you can describe all of this without the mathematics involved <IMG class=smiley src="http://static1.videosift.com/cdm/emoticon/smile.gif">


Math is about symbols, just like written form, just like spoken form. All is interchangable to a certain degree.

Arianesays...

E=mc^2 is not wrong. There are two kinds of energy, potential energy and kinetic energy. (actually there are more kinds, like caloric energy, but that's not relevant) An apple hanging in a tree has potential energy based on the force of gravity exerted on it, and the distance to the ground. As the apple falls to the ground, that potential energy gets converted into kinetic energy, and the law of conservation of energy says that potential energy and kinetic energy are equal. You have force = mass x acceleration and work = mass x distance, and the conversion factor between force and work is velocity squared, so the kinetic energy exerted in moving the apple from the tree to the ground is the mass x velocity squared.

In terms of kinetic energy E=mc^2 is correct. The E^2 version is the potential energy version, which is actually a more useful version, but both are correct.

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