salter

So I have been working on a tesla coil and I just finished the primary circuit. I decided to run it alone (theoretically the spark gap should jump) but nothing happened. Heres the setup. http://www.physics.gla.ac.uk/~kskeldon/PubSci/images/tesla3.gif 10kv 30mA AC neon transformer. Capacitor that I made (rated at 2911 pF and up to 20kV, by my calculations) inductor (haven't done calculations yet... just wanted to see if it worked. But its coiled outwards and has about 8 turns and 3inches<radius<7 inches) Help plz? I would think that it had to do with either the power supply (both lines are hot not just one, and theres an anti short system) or the capacitor not working or the strengths of the inductor and capacitor are too far off. I tested to see if electricity was getting through by forcing it to arc at various points and found that power was just going strait through the capacitor (obviously).

If your trying to avoid toxic chemicals in all parts of the reaction... you could always use electrolysis of something like [ce]MgSO4[/ce] or [ce]NaCl[/ce] in water. It would probably provide the cleanest gas. it is rather slow, however, unless you use a considerable amount of electricity.

I don't mean the reference frame of the matter going in, I mean from the reference frame of someone outside the hole. To them the matter stops on the event horizon. Merged post follows: Consecutive posts mergedand i'm not talking about earlier matter exerting pressure on the latter matter, I'm talking about the new matter exerting force on the older matter that, to the observer, has stopped on the event horizon. The earlier matter has no potential to move unless an infinite amount of time passes from the observer's perspective, but the matter that lands on top of the earlier matter is in an area of less gravity and thus can move and be pulled in from the observer's perspective. Merged post follows: Consecutive posts mergedThat was badly phrased... what I intended was to portray that the matter that is closer to the event horizon (still from an external frame of reference) is being pulled in with much less force with respect to time than matter that is not in as intense of a gravitational field because it is being held back by the earlier matter. Therefore the latter matter pushes on the earlier matter. Now that I rephrase it, it seems to me that nothing would happen except that the earlier matter approaches the event horizon at a faster rate than it was previously, but regardless of how much matter is piled on and how much force is on the earlier matter, the earlier matter will never reach the event horizon. So it isn't what I first thought, that force was being applied to something that is not moving in time. It is just force being applied to something close to not moving in time (still from an external point of view) Right? Does my logic seem correct? Merged post follows: Consecutive posts mergedPerhaps, If I think about the event horizon as an asymptote... matter going towards it will never reach it typically, like a divergent graph. but if the rate at which it is aproaching increases enough, the "graph" could become convergent... And there could be a point in our time as the observer at which the matter actually reaches the event horizon and then force would be exerted on it.... Come on guys i need someone to answer other than me

Black holes and white holes have no connection. All a black hole is is a very dense source of gravity, say the earth compressed to the size of a golf ball. If you go into a black hole, you get crushed. If you could somehow avoid getting crushed you would eventually find yourself standing on the source of gravity. No magical portals through space and time. Theoretically, if you could go past the event horizon (the point at which light can no longer escape and, to the observer, time stops) and then come back, you would travel backwards in time; however, seeing as light cannot escape and nothing travels faster, you cannot get back out.

Like most people on this forum, I find the relativity of time with gravity and speed very interesting. I've done research and listened to lecture cd's about it... and i have had every question answered save one. If you have objects being shot into a black hole and stopping on the event horizon (to us as people outside of the hole) and matter builds up, would anything happen when enough matter piles up to put pressure on the matter that is stopped on the event horizon?

If you live in the USA, I would reccomend checking out unitednuclear.com. They sell plenty of useful chemicals and explain what each one is used for (including the color it adds to pyrotechnics) and even if you can't actually order them because of parents or whatnot, its educational and you will learn a lot about fun chemical things to do. I am personally a fan of KNO3/S/Al flash powder, 5:3:2. It burns REALLY brightly, about equal to magnesium, and is incredibly hot too. its fun just to see what it will burn through. For added heat and brightness, I add magnesium turnings that i get for $4 USD/50g off of ebay. They also make mean M-80's, but don't tell anyone I said that . The hydrogen idea is really cool I've gotta try that

Yeah we are going to try to do some predictions, but they dont need to actually match the results for us to get credit. I have some other ideas that are more complicated (and would actually tie in calculus) but this is the one piece I didn't remember. I'm feeling stupid about my ratios that I gave because those are by weight, not number of particles.

I'm currently doing a project for my calculus class involving doing calculations with flash powder. It has been a while since my last and only chemistry course and my teacher was anything but competent... I can't recall how to find out how much energy is released from an exothermic reaction or how to find the activation energy or anything of the sort. Any help would be appreciated. I'm using [ce]5KNO3 + 3S + 2Al[/ce] flash powder.

Thanks a lot, that was a big help

Ah, I wasn't sure about that. Merged post follows: Consecutive posts mergedYou should still check out the site tho its fun XD

if you haven't checked out http://www.unitednuclear.com you should.

You can always buy it off of unitednuclear.com XD Would it work to put some metal like Mg in NaOH solution? Granted, if it did work it would react with the water but I'm just curious.

Well I'm going to be using different shapes of copper to try to encourage different growth and if the copper reacts with the acid and changes form before the silver starts to precipitate out then it could mess up the shape and growth of the crystal. So then the one last thing I need is a confirmation that the copper would rather react with the nitric acid than with the silver nitrate. Or you could say the opposite was true and that would make me much happier.

rewording what i was asking at the beginning... So do I need to use up all of the nitric acid before adding the copper? If both silver nitrate and nitric acid are left, wouldn't the copper rather react with the nitric acid than the silver nitrate?

So i decided to grow some silver crystals. The conventional way is dissolve [ce]AgNO3[/ce] in water and put in copper, then the copper dissolves to make copper nitrate and the silver precipitates out. I figured that i would just dissolve silver in nitric acid myself... So my question is this: do I need to separate the [ce]AgNO3[/ce] from the nitric acid or could i saturate the acid with silver then just put in the copper?