-=> Quoting Richard Meic to Stephen Williamson <=-
 
 SW> Just a minor correction.  If something does not have mass, it
 SW> cannot have momentum.
 RM> Just a minor correction to your minor correction... :D
 RM> The theoretical "tachyon" is supposed to have a :*negative*: mass,
 RM> thus it is supposed to travel faster then light.
I think the word "theoretical" is the key here...  I recall hearing
something about tachyons, though not in Physics class.  Something
about them travelling backwards in time...
 RM> Light has a zero
 RM> mass, yet it does have momentum.  For your statement to be logical
 RM> light would not have any momentum, thus we would never be able to see,
 RM> in fact stars would not give off heat, no heat no life on Earth, and no
 RM> Stephen Williamson to make a mistake,... no Richard Meic to correct his
 RM> mistake or ramble on and on about it all... 
You are mistaken.  It is because light has *velocity* that we can see.
Momentum is equal to mass times velocity.  If Light has zero mass, it
cannot possibly have momentum.  Zero times anything is still zero.  If
light did have momentum, we wouldn't just see light, we would probably
feel it impact us quite violently.  Since light moves at 300000000 m/s,
even the tiniest mass would result in one hell of an impact force...
 SW> Likewise, an object with mass at rest has no momentum.
 RM> This is true, but cannot be used as support for your incorrect first
 RM> statement.
I was trying to use it to demonstrate a point that I never made.
I forgot to include the formula for momentum in that message, and
thought that the line above would demonstrate the "anything times zero
is still zero" point...  BTW, the formula looks like this:
        p=mv
 SW> I'm in the middle of a Physics course in school, so I
 SW> tend to get a bit nit-picky in my efforts to memorize all those
 SW> damned formulas. :-)
 RM> I have been through a physics course in school so I too can be very
 RM> nit-picky. ;)  Is it not cool how nearly all those formulas can be
 RM> combined into one big formula?  I always found it neat.
        In Frith,
                Stephen "Ravenwing" Williamson
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