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Physics, Astronomy & Cosmology
can e=mc² be solved to give a value for t, time and d, space?
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can e=mc² be solved to give a value for t, time and d, space?
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yamo
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can e=mc² be solved to give a value for t, time and d, space?
«
on:
28/02/2010 19:12:49 »
can e=mc² be solved to give a value for t, time and d, space? what are the values of time and space?
mod edit: Please make your topic titles a question. Because i'm simply gorgeous I have done it for you.
«
Last Edit: 28/02/2010 19:24:46 by neilep
»
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can e=mc² be solved to give a value for t, time and d, space?
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Reply #1 on:
28/02/2010 21:22:36 »
No.
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flr
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can e=mc² be solved to give a value for t, time and d, space?
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Reply #2 on:
28/02/2010 22:36:00 »
The relation e=mc
^{2}
is valid for
any
value of t and d.
In other words, it was valid yesterday and so it is today.
It is valid here in my place and everywhere in universe.
Or, if you wish, if I move an object with rest mass
m
from here to there,
the total energy stored in the rest mass will still be e=mc
^{2}
.
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LeeE
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can e=mc² be solved to give a value for t, time and d, space?
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Reply #3 on:
28/02/2010 23:45:06 »
Umm.. e=mc
^{2}
is not valid for
any
value of t & s (where s= displacement) because the result of s/t must always be <= 'c'
However, t & s are just different qualities of space-time, where t can be equated to s, so you essentially end up trying to deal with s/s. The difference between s & t is really just down to our point of view.
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JP
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can e=mc² be solved to give a value for t, time and d, space?
«
Reply #4 on:
01/03/2010 02:44:54 »
E=mc
^{2}
just tells you how to relate mass and energy for a stationary object (one that isn't moving) at a single point in space-time. It's valid for any single point in space-time that you want to choose, as long as the object isn't moving, so that you can't tell the exact position and time just by looking at the equation.
By the way, the full equation is E
^{2}
=m
^{2}
c
^{4}
+p
^{2}
c
^{2}
,
where p is
momentum
, which tells you about how the object is moving in space. This is usually the one you want to use, since it's valid no matter how fast you or the object is moving. If the object isn't moving, p=0 and this equation becomes E=mc
^{2}
.
Edit: to fix a sign error.
«
Last Edit: 01/03/2010 06:42:48 by JP
»
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yamo
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can e=mc² be solved to give a value for t, time and d, space?
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Reply #5 on:
01/03/2010 06:18:08 »
well c is a velocity delta d over delta t. so what i am looking for is a definition for t or d in terms of e and m. mebbe the limit as delta t(or d) approaches 0.
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JP
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can e=mc² be solved to give a value for t, time and d, space?
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Reply #6 on:
01/03/2010 06:55:14 »
If you care about velocity, which is delta d/delta t, then you can get it from the energy and momentum: v=pc
^{2}
/E. You can't get position of time themselves because the equations are valid at any space-time point you want to choose, so there's nothing to tell you which one you're using.
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Ron Hughes
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can e=mc² be solved to give a value for t, time and d, space?
«
Reply #7 on:
01/03/2010 15:08:42 »
Try working with this one, M = hf/c^2
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Farsight
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can e=mc² be solved to give a value for t, time and d, space?
«
Reply #8 on:
02/03/2010 00:24:58 »
Yamo: no, you can't "solve" this. That's because c is just a conversion factor between our measures of space and time. It's the speed of light, so it's a speed, which is distance over time, and both of these measures are defined using light.
JP: pair production and annihilation demonstrates a kind of "flip flop" between the p
^{2}
c
^{2}
and the m
^{2}
c
^{4}
.
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can e=mc² be solved to give a value for t, time and d, space?
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Reply #8 on:
02/03/2010 00:24:58 »
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