Why does E=mc2 by Brian Cox & Jeff Forshaw

Brian Cox and Jeff Forshaw discuss Einstein's famous theory, and why it matters to each and every one of us.

Category:

Science & Technology

Tags:

• science books
• author videos
• relativity
• einstein
• CERN
• Brian Cox
• Jeff Forshaw
• LHC
• large hadron collider
• physics

[akaAlexthekid]

@ljf95 thanks =)

[omgnotaflake]

I laughed at "Why should we care?"

[ljf95]

@akaAlexthekid yes you can slow it down using super conductors and lasers but this very rarely happens naturally, and it does speed up again after being slowed down but we are still yet to discover why this happens.

[akaAlexthekid]

@ljf95 I thought that the speed of light is variable, or is that just through different things? also I don't know if you know the answer but you sound kinda smart, does the light speed up again once it has passed through what ever was causing it to slow?

[ljf95]

@valarmanwe no not zero although it would shrink. the reason that it is not zero is the fact that light does travel at a set speed-we can measure it. this speed is 299 792 458 m/s so although it is very fast the speed of light is not an infinite velocity so therefore the distance you are going to travel will not be zero. it would be shorter but not zero and it wouldn't take zero seconds either for the same reason. hope you are enlightened and if it makes no sense then tell me?

[valarmanwe]

So if we could travel at light speed, then distance in the direction of travel would shrink to zero ? Is that correct ? That would mean, surely, that we would get from A to B in zero time. No time at all. I`m not a scientist. So I don`t know. I`m just going on the things one of these fella`s said. Can anyone enlighten me ?

[edddotcom]

@psychobollox Jeff but Brians just across the corridor

[psychobollox]

@cristianfcao

don't listen to FractalCodex; that was all crap.it's nothing to do with charge either. this is about the way in which matter behaves at speeds approaching c. the actual equation is better understood in this form: (E/m) = c² ...which shows why - the more energy that is fed into a particle to make its speed approach c - the higher its mass becomes ... as measured from a stationary frame of reference. as for the WHY of all this, you need to read a lot of books.

[psychobollox]

@edddotcom

which one? brian or Jeff?

[gazzaka]

So, you spend your time, saying nothing ?

Sounds about right...make money on your nothing book ;-)