I'm thinking about doing a degree on Quantum Physics/Mechanics, but only really because I'm interested in it. To be honest I'm not even sure if it'll get me a decent job :/
I don't know why but fire amuses me more than anything else i do in science all i need to do is watch it burn a splint and i'm entertained untill it goes out D: that and electrocute myself on purpose :downs:
Fire is the only, I mean [I]only[/I] thing I ever enjoyed about Boy Scout Camp.
... Bump.
Looks like science is sort of unpopular on facepunch. If we can't even support a single thread.
Anyway I was thinking of what I could craft as an electronics student. Some electronic device might show me in a good light after I'm done with foundation year, but mainly this would be just for practice and fun, maybe utility. Maybe I would build it someday and maybe not.
So what kind of device could I come up with...
Probably a psp sized box that could fit in my pocket. With an lcd and some sort of watered-down keyboard.
+ Clock, alarm clock and stopwatch.
+ Calculator.
+ Radio, with filters and record ability.
Also a fold-up muddle of wires and antennas that could tell me strength and direction of magnetic field, electrical field, and record it ( I hope it gets to the point where I could replicate my magnetic door hob), and then maybe emmit/replicate some em/e/m signal. Now that would be something you don't get in an everyday gadget.
+ A music player, lol.
+ A usb flash stick.
+ A cheap camera that I could use to make photo's, videos, and set it up to make a photo at set intervals. No quality necessary.
+ maybe some sort of programming/scripting capability. If I get a keyboard+screen that are any good.
I more or less went through the whole process of programming something like that, but I have very little experience of wiring things together. Little use of manuals when they haven't been brought to practice.
What do you think of my idea? Should I do it?
-*Pokes the thread with a stick* Do you think it's alive?
If you had a bowling ball and a golf ball in zero gravity, would the golf ball orbit the bowling ball?
[QUOTE=Zenreon117;18120357]If you had a bowling ball and a golf ball in zero gravity, would the golf ball orbit the bowling ball?[/QUOTE]
Not if they have no gravity, but I assume you mean there's no other source of gravity.
It could only orbit at a particular distance and velocity. Since the gravity of the bowling ball is really weak, the orbit would be very, very slow.
The forces between the two would be tiny, so I don't think so.
Gravitational force of a golf ball is 4.5x10^-24 N, and of a bowling ball 5x10^-22 N. Teeny
[QUOTE=McSanchezV2;17749790]There's no such thing as centrifugal force.[/QUOTE]
Yes there is. There's reactive centrifugal force due to inertia.
[editline]07:52PM[/editline]
[QUOTE=BAZ;18120471]The forces between the two would be tiny, so I don't think so.
Gravitational force of a golf ball is 4.5x10^-24 N, and of a bowling ball 5x10^-22 N. Teeny[/QUOTE]
That depends how far they are from each other and their masses, but the golf ball could orbit no matter how weak the gravitational force is. The only thing that would be affected is the velocity of the orbit.
[QUOTE=Zenreon117;18120357]If you had a bowling ball and a golf ball in zero gravity, would the golf ball orbit the bowling ball?[/QUOTE]
You need gravity
[QUOTE=rb_pk;18120716]You need gravity[/QUOTE]
Everything has it's own gravity. If the balls were free floating in a zero gravity chamber with no other source of gravity they would still emit a very, very, very low gravitational force causing a very, very, very small orbit.
Would be pretty cool.
[QUOTE=OvB;18120986]Everything has it's own gravity. If the balls were free floating in a zero gravity chamber with no other source of gravity they would still emit a very, very, very low gravitational force causing a very, very, very small orbit.
Would be pretty cool.[/QUOTE]
I dont think so
[QUOTE=rb_pk;18121441]I dont think so[/QUOTE]
Then you are wrong.
You can orbit at any distance from an object of any mass, so long as the masses are outside each other, of course. The only thing that will change is the velocity of the orbit.
[img]http://img407.imageshack.us/img407/7340/radio2y.png[/img]
Looking for advice from anyone who knows anything about electronics.
Would this make an AM radio?
For solenoid, would 50 rounds of copper around a pen be alright, or do I really need something like 200 rounds around a plastic bottle?
Not sure what all I know at this point, but I'm hoping to take physics in my coming years of high-school. Currently, I know this-and-that about chemistry.
Anyone?
Aaah this thread just won't live!
Why can't I have a good discussion when I have so much questions :( like the on previous page...
[QUOTE=JohnnyMo1;18120501]That depends how far they are from each other and their masses, but the golf ball could orbit no matter how weak the gravitational force is. The only thing that would be affected is the velocity of the orbit.[/QUOTE]
If they were stationary, they would just eventually hit each other. If the golfball was moving at just the right velocity (tiny) then it would.
The speed of the orbit is going to be so slow though.
Guys, perfect sphere, possible y/n
[QUOTE=LordLoss;18142847]Guys, perfect sphere, possible y/n[/QUOTE]
its possible
[QUOTE=Nikita;18121644][img]http://img407.imageshack.us/img407/7340/radio2y.png[/img]
Looking for advice from anyone who knows anything about electronics.
Would this make an AM radio?
[/QUOTE]
Not quite. You've made a resonance filter (that's non-linear with frequency, mind you) but you never demodulate the signal. You need to pass it through a second filter.
How? I figure there should be a second capacitor after the diode somewhere; But how should it's capacitance relate to the rest of the scheme?
Also, thanks for replying.
My (used to be) best friend studys electronics. Shame he's never there anymore due to cocaine, alcohol and weed.
I love both Chemistry and Natural Science
Does anyone know how do I make a variable capacitor with maximum capacitance of 100 microFarads?
I have some aluminium foil;
Alternatively I have a 1000, 47, and 10 microfarads non-variable capacitors. Maybe there is a way to wire one of them so capacitance could vary?
[QUOTE=BAZ;18141103]If they were stationary, they would just eventually hit each other. If the golfball was moving at just the right velocity (tiny) then it would.
The speed of the orbit is going to be so slow though.[/QUOTE]
Yes, but it can orbit.
I recently applied to my local college for a university transfer science program. If I follow my plan so far (but it could change at any point), I will likely do two years of basic scientific education (with some arts/social electives) and then head off to university for an advanced degree in something specific. I don't know what I want to do yet, because there are so many fields that I'm interested in. I'll play it by ear.
SCIENCE :love:
[QUOTE=Nikita;18188106]Does anyone know how do I make a variable capacitor with maximum capacitance of 100 microFarads?
I have some aluminium foil;
Alternatively I have a 1000, 47, and 10 microfarads non-variable capacitors. Maybe there is a way to wire one of them so capacitance could vary?[/QUOTE]
I suggest you to buy one. Last time I made a radio, it had over 40 electronic components. Still haven't tested it since I'm too lazy to wire it up with a speaker.
[QUOTE=Nikita;18121644][img]http://img407.imageshack.us/img407/7340/radio2y.png[/img]
Looking for advice from anyone who knows anything about electronics.
Would this make an AM radio?
For solenoid, would 50 rounds of copper around a pen be alright, or do I really need something like 200 rounds around a plastic bottle?[/QUOTE]
The LC circuit looks good so far. Also, you need a Zener-Diod (because the voltage in the LC circuit is low) for this if you didn't know yet.
Here is a simple circuit I just painted. Might contain mistakes but I hope you get the point.
[img]http://img94.imageshack.us/img94/1769/simpleamradio.png[/img]
[b]EDIT!![/b]
I did not see your transistor in your painting. Anyway, I made a new picture for this which looks the same as yours. So it should work.
I just added an additional capacitor in order to smooth the signal. Here is a picture:
[img]http://img215.imageshack.us/img215/831/smoothingsignal.png[/img]
The red line is actually the AM-Signal/Beat-Signal you want to hear later. So better take that capacitor in :) (a few nF should be ok).
[editline]11:01PM[/editline]
[QUOTE=Luuper;18142982]its possible[/QUOTE]
It isn't, just in a good approximation (Water in space without external gravitational fields). But since matter is quantized (atoms) you can't have a perfect continuous sphere.
This should be included in every science thread ever:
[url]http://www.lpi.usra.edu/resources/apollo/[/url]
Full photographic documentation of the Apollo missions. Every single photograph from every single magazine from every Apollo mission that took photographs. All of the important missions have full resolution high detail photographs, like the one below. Less important missions feature only important photographs in full resolution. The only important photograph it doesn't have in full resolution is the original Apollo 8 Earthrise photo, but there are plenty more Earthrise photos taken on other missions that are available in full resolution (and if you really really want it, you can get a high resolution Apollo 8 Earthrise from Wikipedia).
(click the link to see it in full resolution; you can read Buzz's fucking nametag for god sakes - oh, and that tiny little blue dot in the top of his visor, above the reflection of Neil Armstrong, is Earth)
[media]http://www.lpi.usra.edu/resources/apollo/images/print/AS11/40/5903.jpg[/media]
Be warned: Most of the images, especially images of the Earth, will make you feel incredibly insignificant and may make you experience some spiritual insight into what we really are.
When viewed from the surface of the moon itself, Earth is small enough that if you stick up your thumb and hold it out at arms length, you can hide the entire sphere behind it. Everything that everyone has ever known and seen and done, and all of the billions of people with all of their billions of problems, hidden behind a single thumb, almost as if it were not there at all, further demonstrating just how incredibly tiny and meaningless we actually are. But don't just take my word for it, here, try it for yourself:
[media]http://www.lpi.usra.edu/resources/apollo/images/print/AS11/40/5924.jpg[/media]
Of course, that Lunar Module is a fairly large craft, so put it in correct perspective first to realize just how tiny and meaningless Earth is.
Huh
Suddenly, my post is gone.
Anyway, thanks aVoN, now I understand what a capacitor does there.
But I'm pretty confused at why is it where you've put it. Would it be ok to put it in parallel with just the headphones?
[QUOTE=J Paul;18190918]
[media]http://www.lpi.usra.edu/resources/apollo/images/print/AS11/40/5903.jpg[/media]
[media]http://www.lpi.usra.edu/resources/apollo/images/print/AS11/40/5924.jpg[/media]
[/QUOTE]
The second picture is pretty scary.
Also, kinda related. This picture was taken from the LRO Lunar orbiter a few days ago.
For those who are going to complain about the shitty quality, this picture was taken from 50km away.
[img]http://www.cubeupload.com/files/a33a00lroapollo17flag.jpg[/img]
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