• Physics Discussion
    973 replies, posted
i broke it [img]http://i.imgur.com/EhVHJoh.png[/img]
No it's clearly showing you that if you detonate a nuclear device that powerful the world will become a series of orange eggs suspended in viscous red liquid over a dirty sea. Duh
If two beams of light coming from opposite directions pass each other, how does that work? Neither of them, can, at that speed, be treated as static because then the other one would be moving at 2c, wouldn't it? How is this explained?
Firstly, velocities don't add the same in relativity as they do in regular mechanics. Two objects moving with velocities v and u's velocities add like (v + u)/(1 + vu/c[sup]2[/sup]). You can see that if the velocities are small compared to the speed of light, you get the usual v + u. Secondly, and probably more importantly for this question, light has no reference frame. You can Lorentz transform into the frame of a photon, the transformation fucks up. It makes no physical sense to ask what something looks like from a photon's perspective.
Oh ok cool.
But we [I]can't[/I] apply it to a photon!
Then we still couldn't do it because it doesn't work for any particle traveling at c!!!!!1!
What if an object was moving at 99.9999999999999999999999% c?
[QUOTE=zzzz;39639853]What if an object was moving at 99.9999999999999999999999% c?[/QUOTE] The object would be moving at 99.9999999999999999999999% c. You could calculate relativistic effects as normal. In 1991 they detected a cosmic ray proton moving at 0.9999999999999999999999951c, having 40 million times more energy than we can generate with any particle accelerator. [editline]18th February 2013[/editline] [QUOTE=Yahnich;39639862]yea but i just mean like by approaching C goddamnit and just kinda guessing what would happen!!!![/QUOTE] Sure you can use a limiting process but that doesn't mean that's how a photon experiences things
Oh, I didn't notice we have a Physics thread. Going to Switzerland with physics class to see LHC @ CERN atm :3
[QUOTE=JohnnyMo1;39639966]The object would be moving at 99.9999999999999999999999% c. You could calculate relativistic effects as normal. In 1991 they detected a cosmic ray proton moving at 0.9999999999999999999999951c, having 40 million times more energy than we can generate with any particle accelerator.[/QUOTE] What happens if someone was standing in the way?
[QUOTE=Krinkels;39640033]What happens if someone was standing in the way?[/QUOTE] [img]http://i.imgur.com/EhVHJoh.png[/img]
[QUOTE=Yahnich;39640022]do you enjoy making me cry[/QUOTE] yes
Idea: A nuclear fusion reactor that looks like a giant iron sphere. It creates heat at it's center and this heat then moves towards the surface. Near the surface, iron is solid, but warm. The deeper, the hotter, so iron is molten at some depth. Then gaseous. Then ordinary hot plasma, where atoms are stripped of electrons. Then nucleon plasma, that is so hot that atoms are broken down to individual protons and neutrons. You insert fuel - any material that is not iron - into the center. It breaks apart, then re-forms as iron atoms, releasing energy in the process. This energy is what keeps the reaction going and sustains the heat. Gaseous iron is then continuously removed from the chamber to keep a constant pressure/temperature. Warm surface of the sphere is coated with some material to protect from rust, and submerged in water. Water boils and pushes a steam turbine, generating electricity. Is such a thing even possible?
Well, yeah, if iron fusion wasn't an oxymoron, and you could control what elementary particles were formed into, and if you could somehow have nucleon plasma in a sphere on the scale of Earth's radius, and if you could remove gaseous iron.
and if you could insert gases into the center of this sphere without releasing the extreme pressure.
Quantum mechanics: AKA adventures in integrals that make you want to kill yourself
[QUOTE=JohnnyMo1;39640953]Quantum mechanics: AKA adventures in integrals that make you want to kill yourself[/QUOTE] I'm in Calculus I, integrals don't seem so bad.
Take QM and you'll see.
The integrals in QM are hellish and often intractable, I've found. The occasional one will be manipulable into an approachable form (although usually only one approachable with a table of integrals ready) but I've found a lot vastly quicker to approach numerically -- much as that makes me sad. Speaking of QM, finally saw and followed a proof of the uncertainty principle. It was beautiful.
[QUOTE=Falubii;39641365]I'm in Calculus I, integrals don't seem so bad.[/QUOTE] Trust me it gets worse, even just in Calc II.
[QUOTE=Falubii;39641365]I'm in Calculus I, integrals don't seem so bad.[/QUOTE] What you said there essentially amounts to, "I'm in a class in which my teachers intentionally give me easy integrals to solve, and they're easy to solve!" It gets WAY trickier. WAY TRICKIER, MAN!
Last night I got an integral that looked like x times a Gaussian albeit with an ugly constant multiplying x in the exponential but then I realized it was actually minus a function of x squared, not just -x^2, and I had no idea how to solve it :V [editline]19th February 2013[/editline] Luckily my professor said in class today that the rest of the course will tone down the calculations.
Tables of integrals are literally the greatest thing.
Mathematica has covered me pretty well too for 6 years now.
I just wanted to see how much I could fuck with you guys. It wasn't hard.
[QUOTE=Swebonny;39630366]You may have seen me post this image before: But we had this lead castle for safety reasons. [/QUOTE] did your source disks look like this? Looks slightly tasty.. probably salty, cesium chloride I imagine. [url=http://postimage.org/][img]http://s18.postimage.org/rypwa5qc9/sourcedisk.jpg[/img][/url] [url=http://postimage.org/][img]http://s18.postimage.org/4vzdazoux/geigercs137.jpg[/img][/url] 10 microcuries is puny but can easily produce count rates over 2000 CPS on a scint counter, so I imagine larger sources aren't really needed, but you do have that giant castle.
[QUOTE=Killuah;39645511]Mathematica has covered me pretty well too for 6 years now.[/QUOTE] Mathematica is the other greatest thing.
[QUOTE=Falubii;39647478]I just wanted to see how much I could fuck with you guys. It wasn't hard.[/QUOTE] Keep in mind that most people don't even know what an integral is. [sp]You basically did this: http://static2.fjcdn.com/comments/Are+you+trolling+or+just+actually+retarded+_50056cf35cec49ac6e6d37aa443c6e73.png[/sp]
[QUOTE=fox '09;39648928]did your source disks look like this? Looks slightly tasty.. probably salty, cesium chloride I imagine. [URL="http://postimage.org/"][IMG]http://s18.postimage.org/rypwa5qc9/sourcedisk.jpg[/IMG][/URL] [URL="http://postimage.org/"][IMG]http://s18.postimage.org/4vzdazoux/geigercs137.jpg[/IMG][/URL] 10 microcuries is puny but can easily produce count rates over 2000 CPS on a scint counter, so I imagine larger sources aren't really needed, but you do have that giant castle.[/QUOTE] I'm guessing our school were just being overly cautious (also probably for students actually dealing with more radioactive stuff). Our disks didn't have the yellow label, else the shape is quite identical. I looked up our data, got a bit baffled when I saw the huge counts but then I remembered we were recording data for 100 seconds. Cs-137 counts : 211787 (2118 CPS) Co-60 counts : 57295 (573 CPS) So nothing too big in the end :v:
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