[Closed] E=mc^2?

42

For a start - it's the only way the units match up.

But what is the question CFH?

You think that's interesting consider the sqrt of 2, fantastic number, its what makes our system of paper sizing work.

Or Pi, how did anyone actually work out the value of that number anyway?
No seriously, you can measure it, but not accurately, someone had to work it out.

But in answer to your question, it's mostly down to using sensible units of measurement, imagine what it would be if you were using imperial units...

This will bend your mind, you think in numbers based around ten. But a better number to base it around would be 12. Only 12 wouldn't be twelve, it would a be 10, but with two extra numbers between it and 9.

42

6*7

But what is the question CFH?

how many times will CFH mention the BA lounges this week?

But what is the question CFH?

What is 6 x 9?

Anyhow, it's interesting to compare with kinetic energy - E=(1/2)mv^2

Meh, S=A/4 is where it's at. So simple for something so complex.

unklehomered - Pi is a non recurring irrational number so can never be fully worked out, just calculated to LOTS of decimal places. And BTW there are 10 types of people in the world, those who understand binary and those who don't.

Are you still stuck on that train Stoner?

Do you want me to go through the proof for you?

Oh, and the one that always makes me go "woah" is: e^i? = -1

this is a personal favourite of mine: e^i?=-1

https://xkcd.com/179/

and in stonerworld, everything would be base 60 like the babylonians.

12 factors Rools!

EDIT: Hah! Ben. I think we might be on similar wavelengths. Is there a documented coincidence of Rohloff fans and e^i?=-1 fans? I think we need to know.

But what is the question CFH?
What is 6 x 9?

Anyhow, it's interesting to compare with kinetic energy - E=(1/2)mv^2

Just in case Ben does a sneaky edit.... 😆

Because its mostly good enough on the scale to which its applied.

^^Sir, sir! He said a rude word, sir!^^

😉

.9999 recurring = 1

****s enough people's heads in my experience without getting into noneuclidean geometry

I am not sure but,

I know C is calculated as a ration between the size of two forces (I am sure it was Maxwell that did this) so it follows that in E=MC2 Eistein used Maxwells work to link these forces to mass and energy.

Again I might be completely wrong, and it was a long time since I did my natural Sciences degree!

noneuclidean geometry

if it cant be done with a rule and pair of compasses and pencil, it cant be done at all. FACT!

nickc - my fave head *****er is demonstrating that there must be different sizes of infinity. Easily done on the back of a beer mat.

Just in case Ben does a sneaky edit....

I did a sneaky edit, but only to add in the (1/2) 🙂

Am I man, I am stoner....

Chain saw, landy , leg eating lawn mower, compass....

And he's as happy as a lop

Can I recommend
[img] [/img]
To you all?

A fascinating read if you like numbers.

Not to correct your 6 x 9 = 42 then?

and one from me:
[img] [/img]

Not to correct your 6 x 9 = 42 then?

No, I stand by that, it's completely correct.

In base 13 😉

But in answer to your question, it's mostly down to using sensible units of measurement, imagine what it would be if you were using imperial units...

It's true regardless of units. Measuring energy in tonne furlongs per fortnight squared is just as valid as joules. Just not as easy.

12 factors Rools!

Base 12 is logically superior to base 10.
But it can be a bit of a head**** to understand it initially.

I used to know hexadecimal quite well - did a module on computer programming and memory as part of computational chemistry at uni so an understanding of hex was very useful.

+1 for that book above, Alex's Adventures in Numberland. Fascinating read.

Measuring energy in tonne furlongs per fortnight squared

I think mcmoonter does that.

The purist

How long is a piece of string? Depends on how fast your going?

Or

What do we want?
Time travel
When do we want it?
It's irrelevant.

The universe appears to hang together on the whim of a rather prosaic mathematical function.

Mathematical functions have whims?

mine do. But then i is not rational.

bdum tish.

No, I stand by that, it's completely correct.

In base 13

but nobody makes jokes in base 13.

6 x 9 = 42

Anyone who doesn't understand this should go back to their school and ask for their money back.

Before I do, I don't suppose you'd clarify? 😯

I guess he means that you should have been taught that base-10 is only one way of counting.

Yes, your gripe is with the school library.

Ooooh I think I might be experiencing the next page bug thing... ???

EDIT: not sure, does the forum server work in Base 10 or 12?

You have read [i]all[/i] the books in the series haven't you?

Oops sorry Ben, too clever, looks like back to school for me...

Before I do, I don't suppose you'd clarify?

It's the corrupted question in Arthur's brain.

Pff, kids of today.

Actually the base 13 thing is just coincidence, the root cause is the intimely introduction of Telephone Sanitisers into the Gene Pool.

Mr Woppit

H2G2

Oh. Hmm.

http://en.wikipedia.org/wiki/23_enigma

It's funny how the world can be divided between people who've read H2G2 and those who haven't - it's all the inside jokes.

Like I was discussing democracy with someone recently, and I said something about how the wrong lizard might get in - I just got a blank look.

It's a bit like The Big Lebowski that way.

Used to be "those who've read Illuminatus and those who haven't..."

I'm in a clique! I'm in a clique!

http://en.wikipedia.org/wiki/23_enigma

maths and physics are great tools for people who don't know what they're talking about.

Oh god, the Illuminatus. The most effective book in the world for making all your freinds really boring for months and months... I do not miss those days at all.

I like:
sqrt(i) = sqrt(1/2) + i * sqrt(1/2)

I once told my boss in a pdr that the whole department had seats on the B Ark. Went totally over his head.

if you define c as 1, rather than a random figure, it becomes E=M !

apatr from the fact it isnt, it is actually

E = M + P^2

(or E^2 = M^2C^2 + P^2C^4)

which is why particle colliders work

And BTW there are 10 types of people in the world, those who understand binary and those who don't.

I always find E.psi=H.psi to be something that makes my brain hurt. A lot.

Stoner - Member
this is a personal favourite of mine: e^i?=-1
https://xkcd.com/179/

but nobody makes jokes in base 13.

CZ - thanks... I'm here until DEC 25, or is that OCT 31? You decide!

here you go donk

http://en.wikipedia.org/wiki/Eule r's_identity

There are 10 types of people in the world, those who understand binary, those who don't and those who understand gray code.

F111

My head!

All of it! 😕

There are 10 types of people in the world, those who understand binary, those who don't and those who understand gray code.

There are 10 types of people in the world, those who understand binary, those who don't, and those who understand ternary.

F111

[IMG] [/IMG]

😀

Actually the base 13 thing is just coincidence, the root cause is the intimely introduction of Telephone Sanitisers into the Gene Pool.

That's the official version. Presumably I'm not the only person to wonder whether the pan dimensional beings had 13 fingers though?

As for ?, sine is a fairly fundamental function, and sin(?/2) = 1. Hence ? = 2 * arcsin(1). Using the infinite series expansion:
arcsin(x) = x + (1/2)*x^3/3 + (1*3/2*4)*x^5/5 + ...
? = 2 * (1 + 1/(2*3) + 1*3/(2*4*5) + ...)

There's probably an easier way, but that's one way to calculate ? from first principles.

The universe has no real relationship to that equation - it doesn't rely on it or hang together because of it.

All science is a guess, hypotheses that people come up with with a made up set of rules that we then use to try and predict what will happen.

The fact that the equations seems to predict some stuff we can measure means that we trust our lives to them.

It's the best guess until a better one comes along.

Do I exist? Do you exist? That's where we start going when you question the fundamentals of science. Some of the things discussed in this thread are mathematics, hence really are fundamental - nobody is ever going to prove them wrong, because they don't rely on measurements. Some is physics, but the current "best guesses" are actually extremely good ones.

Of course it is worth bearing in mind that E = mc^2 actually disproves KE = 1/2 mv^2

Of course it is worth bearing in mind that E = mc^2 actually disproves KE = 1/2 mv^2

that sounds to me like a very bold statement. How exactly does it disprove it?

[img] [/img]

How exactly does it disprove it?

KE equation is part of Newtonian physics and Einsteinian physics shows that Newtonian physics is just a very good approximation at low speeds.

There are 10 types of people in the world, those who understand quantum computing, those who don't, and those who are a superposition of both 8)

As for ?, sine is a fairly fundamental function, and sin(?/2) = 1. Hence ? = 2 * arcsin(1). Using the infinite series expansion:
arcsin(x) = x + (1/2)*x^3/3 + (1*3/2*4)*x^5/5 + ...
? = 2 * (1 + 1/(2*3) + 1*3/(2*4*5) + ...)

Out of curiosity I decided to try calculating it using that formula. It clearly doesn't get there that quickly - after 200,000 terms I have 3.139070 (currently running to 1 million terms but it's taking a very long time - I have a total of 500 billion multiplications or divisions to do that, so I guess it's not surprising!)

The volume of a pizza of radius 'z' and thickness 'a' is....

pi z z a

Yeh!

[s]^^^ That guy wins.
[/s]

EDIT: bugger it!

<<< that guys wins!

/thread

@ScottCheg - love that !

As for E= m c^2 we covered the derivation in the first year at Uni and I'm delighted to report that I have no recollection of it which means something more useful has taken its place or worse these brain cells have died, it was in 1981.

It's threads like this that make me want to take STW, love it, hug it to my chest and call it George... 😀

Disappointed at the lack of Big Audio Dynamite in this thread.

It's amazing..
[img] [/img]

[url= http://www.amazon.co.uk/Why-Does-mc2-Should-Care/dp/0306819112 ]Why does E = Mc^2[/url]

Just for you knottinbotswana

and as a bonus

which is so 80s it hurts.