Re: MPhysics 21: p = ?, 'p = 0' = ? & 'm = 0' = ?

Posted by kx21 on May 08, 2003 at 16:35:45:

In Reply to: Re: MPhysics 21: SR's E = SR's E= SQRT(p^2c^2+ m^2c^4) & p = ? posted by DickT on May 08, 2003 at 15:28:01:

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* M Physics 21
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Given SR's E= SQRT(p^2c^2+ m^2c^4).

1) What exactly p is , mathematically?

2) what p = 0 is, physically? and last but not least,

3) What m = 0, exactly is, in the physical world?

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