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• Smart﻿ Ass.

• I love minutephysics wish my channel was as good!﻿ /watch?v=oLPgNkuzw8M

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• finally! I have a answer to my﻿ question :D thanks

• LMFAO I was posting a lot of antitheist stuff on the page for the video "Crash Course in﻿ Presuppositional Apologetics: Self Refuting Worldviews" and was getting a ton of dislikes on my comments (as was the idiotic theist I was arguing with).

So I posted the contents of this video onto that page, came back later, and found a ton of dislikes on the comment. Says a lot about how easily biased and intentionally closed minded so many people are.

• Wrong. The momentum of a massless particle is calculated by dividing Planck's Constant by the wavelength﻿ of the particle.

• Hmm, that may be possible, I was thinking distinctly of the visible pro-universe (if I may coin a term...). I am not so well versed on the subject of antimatter.﻿

• oh, i﻿ just researched it and it turns out dirac used this and discovered antimatter i think

• No,﻿ the negative value is unphysical. This is a case where the purely mathematical solution is correct, but doesn't mean anything, and we therefore discard the negative solution when we want to describe something in the real world.

• does this﻿ mean that the energy can be negative?

as E=+ or - sqrt((mc2)2+(pc)2))???????????

• not if it's moving at the speed of light and you use the formula for the relativistic momentum. p = m * v / sqrt ( 1 - v²/c² )

This results in 0/0 which﻿ is mathematically undefined, i.e. a massless particle at the speed of light (a photon) can have any momentum, which is solely defined by the amount of energy it contains.

• WAIT - if﻿ e = pc if a object has no mass, that means it has no momentum.

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