NeonBlack

Here's a video of a fighter pilot who had to eject after a bird went into his engine.

It's usually the other way around- A square wave (or any arbitrary waveform) can be decomposed into sine waves at integer multiples of the fundamental.

Yes, I think you basically have the right idea. It is possible for a cold object to transfer energy to a hotter object or for a particle to move into a region of higher density on a molecular scale, but in macroscopic processes, the system will tend towards equilibrium. That's thermodynamics. If you want to, you can think of entropy as your "unknown force." Thermodynamical systems always like to maximize entropy (which is a macroscopic quantity).

A lot of firefox problems are caused by extensions. Try disabling them and see if it helps. I remember hearing a little bit ago that fast dial in particular was causing a lot of problems.

New internet meme right here from SFN. Vegeta, what does the scouter say about his energy level? It's nearly ten thoouuuuusssaaaaand!!!

If the only thing I read all day was Garfield and The Lockhorns, I'd be pretty depressed too.

Does anyone remember the day after election day when Franken was down a few hundred votes and Coleman said that if he were in Franken's position, he would concede the election? Now he's losing and suing. From today's Star: The irony is great.

I don't think so. Would it explain stable orbits? Energy levels?

It is difficult to date once-living (dead?) things which are older than 50000 years using C-14 dating. This is what you probably heard and misunderstood (or heard from someone else who misunderstood.)

Yeah! That was it. Nice find, iNow.

Very cool. But I thought I remembered reading about a mushroom or some type of fungus near Chernobl that did something similar. Has anyone else heard that? I'll have to try to find it again.

Yeah, it happened earlier- on the 366th day of 2008. Apparently, there was a bug in the Zune clock driver (not written by microsoft). Someone forgot about leap years. http://www.zuneboards.com/forums/zune-news/38143-cause-zune-30-leapyear-problem-isolated.html I think it's been fixed already though. --- I just re-read it. I guess they had considered leap years, the code was just implemented incorrectly. And nothing has been "fixed"- disconnecting and reconnecting the batter resets the date so it works again (at least for 4 more years).

No I can't get it either. Maybe it was hacked. It might be back up in a few days. In the meantime, there is a similar site, hackthissite.org you might be interested in.

Petanquell, most bands and orchestras tune A at either 440 or 442 hertz. (I think I remember hearing that 442 is more common in Great Britain) Not all instruments have the same frequencies for the same notes, especially for band instruments. For example, I think a b-flat on most trumpets is the same as a c on a piano. (The thing in the picture is called a "tuning fork," and you use it to "tune" your insturment. Harmonizing is something entirely different. paganinio, I know that audacity has some frequency spectrum analysis tools. If the audio file is of a single instrument, you will probably be able to do it, otherwise, it may be very difficult to do anything, especially with a lot of drum sounds in it. The best way is probably to use a tuner and a good ear.

It depends on the wavelength you want to block and the thickness of the material, but yes it can. Just not quite as well as materials with higher condivtivity.

Silly English (UK) speakers spell everything with an s!

Of course. Meteors glow. The Hoover Dam generates light for Las Vegas.

This might be a useful picture to think about- completely classical (as in Maxwell): Imagine a particle (say a proton) at rest at the origin (0,0,0). Along comes some radiation traveling in the +z direction with the electric field oscillating in the x-axis and the magnetic field oscillating in the y-axis. Let's say when it reaches the proton the electric field is in the +x direction and the magnetic field is in the +y direction. The electric field pushes the proton in the +x direction and the vxB force is in the +z direction. 180 degrees later, the electric and magnetic field are in the -x and -y directions. Now the electric field pushes the proton in the -x direction, but the vxB force is still in the +z direction. So the time average of the force in the x-axis is 0, but there is a net force in the +z direction. Now the proton which was initially at rest now has some momentum in the +z direction. Where did it come from? It can only be that the light was carrying some momentum and transferred is to the proton.

Maybe there is no one "right" derivation, but some are definitely more wrong than others. I think that saying p=mc is more confusing than instructive. Why use p=mc in derivation but p=mv in application? Making this simple is not hard. For light: Planck sez: [math]E=h \nu[/math] Einstein sez: [math]E=pc[/math] This comes from [math]E^2=(mc^2)^2+(pc)^2[/math] in relativity with m=0. (Maxwell's electromagnetic theory gives the same result for light, but not as tersely.) Now all you have to do is imagine that this also works for small massive objects as well.

Swanson: Could you provide some more details on the mini-golf incident? Another side note: If you use p=mc, this is called the Compton wavelength.

I don't think there is a derivation which is not flawed.

Thank gawd the election is (mostly) over. Anyhow, I don't understand your drawing either, but I am gonna go with a big NO.

I'm sorry I don't understand why you're getting so upset over this.

Oops. You're right. I was also thinking about [math] \lim_{x\to 0} (1 + x)^{\frac{1}{x}} [/math] and in my head I turned it into [math](1 + \frac{1}{x})^{\frac{1}{x}}[/math] I guess it's usually clear based on on context then. But it's not very often that I will do that. Tracker: The binomial expansion is [math] 1+\frac{n!}{(n-1)!} \frac{1}{n}+\frac{1}{2}\frac{n!}{(n-2)!}\frac{1}{n^2}+\frac{1}{6}\frac{n!}{(n-3)!}\frac{1}{n^3}+...[/math]

Is there anything wrong with that? We can also define the natural logarithm as the anti-derivative of 1/x no? tree, you don't understand. When I say "I assume that this exists," it only means that I am not going to show the proof. And how would you do that? If you let n go to infinity since ln 1 =0' date=' you have [math']\infty \cdot 0 [/math] which is a good time to bust out l'Hopital By the way: the sequence is not rational. Look at n=2. [math]a_2=\sqrt{\frac{3}{2}}[/math] DH: The binomial expansion way is very nice. I didn't know about that before.