Recent content by Tree Penguin

Hi, just out of curiosity, i heard about a new electron gun (if that's the proper term) using a laser pulsing at about 3.333 x 10e14 Hz to increase the frequency at which the electrons are emitted. How does the laser reach such pulsing frequencies? Thanks.

Thanks Hootenany, that helped!

So you get one easy shot somewhat leveling the dc out by using a better capacitor inside the adapter? One because a capacitor doesn't work with dc right? Or did i miss something in high school? Thanks

Ok thanks. What is used to convert it to a straight current?

Electro magnets / DC / metal wire / vibrating? Hi, just a very basic question: I just tried making my own electro magnet (copper coil, steel core, connected to a 12V 2A DC power source) and i noticed that when i hold a metal wire (or just anything that's normally attracted by magnets) in...

Ok thanks, i got these questions left: As a reference, what is the terminal velocity of a particle of sand in the air? And, in <a href="http://scienceworld.wolfram.com/physics/TerminalVelocity.html">this article</a> there is/are the costant(s) C and D or CD, what are they? Thanks

Thanks, that helped, i still got a question though, the final equation is: 6*PI*viscosity*radius* 'free stream velocity' How can it be that the particle mass isn't used, that would mean any particle (paper or rock) will go through just as easy. I don't know what the 'free stream velocity'...

Thanks, np. So that means particles of the same density, no matter what size, slow down at the same rate?

I don't really understand the formula: You say it's: \vec{F}_{fr}=6\pi\eta r\vec{v} So for aparticle with a radius of one cm in air (\eta=0.15 cm^2 s^-1) that would be: \vec{F}_{fr}=6\pi *0.15*1.0*\vec{v} ? That doesn't seem right, did i do anything wrong?

Ah ok, thanks. I don't know the term viscosity (at least, i don't know what it is in dutch), i found a translation and it's translated as stickyness, i think i will search for some viscosity tables to get a better idea of what it exactly means. Thanks.

A particle engine is a computer program that can simulate the behaviour of particles (as used in special effects for water, smoke, dust and fire). To build such a program i need to know what affects the behaviour of these particles. I know all the intersection math i will need, i just need to...

Hi, i am building a basic particle engine and i need to know what affects a 'particle' (a bit of dust for instance), i got these questions: What affects the rate at which the air slows down the particle when moving? It's volume and force (velocity*mass)? What affects gravity? It's volume...

Hi, what can cause a capacitor to hum? My active speakers are producing a lot of hiss (tweeter) / low humming (bass speaker) and the cause seems to be a capacitor as it vibrates a little and makes some noise doing it. Is it because of ageing? Thanks.

Hi, i read something about light turning red due leaving gravitational fields. A long time ago i played a game called ascendancy which was about colonizing solarsystems and battling other species and they had a few different kinds of stars in it, a few of these where white and blue dwarfs and...

To see a color light must bounce onto something that has a color (which means does not absorb all light) and that light (or light directly from the emitter) must reach at least one of your eyes. If there's nothing there that emits or bounces light you won't see any light which will result in...