big314mp

If you could get the gap spacing right, you could use that. You will probably have to slot the copper pipe, otherwise it will do a good job of blocking the magnetic field.

Thanks

It's good that no one in your neighborhood was hurt. Hope the clean up goes okay for everyone down there.

That graphic really isn't very good at explaining, but I'll use the bottom image to make the point. Rutherford saw most of the alpha particles go straight through. That means the atom is mostly empty space. Some were deflected at small angles, and some rebounded back at him. Those that were deflected indicated that there was something relatively immobile in the atoms, which implies a high mass. The fact that so few were deflected implies that this heavy object is very small. Thus, the Rutherford gold foil experiment provides evidence for the existence of the atomic nucleus.

Dak: The birch one had the edge going across the grain, whereas MDF doesn't have a grain. Phi: To me, holding a good edge would be staying sharp at all. My terminology was quite off in that respect. And I just tried some oak, and that worked a little better than the birch. I'll have to try Dak's suggestion and go across the grain, to see the effect of that.

So basically box jumps while wearing a weight vest? :D:D:D:D

Indian? I'm not quite familiar with that language

whoa, hold on there guys...I wasn't planning on making a practice sword and using it. This is more of an experiment as to the ability of wood to hold a good cutting edge. At the moment, I'm just taking 1 inch pieces of wood, and trying to sharpen them with an electric sander, and then comparing the characteristics of the edge.

I have some oak drying in the garage ATM (for various other projects). I'll try some of that in a few days. That's the thing though...a point is pretty easy to get, but the edge is remarkably resistant to sharpening. I'm wondering if wood just won't develop those micro serrations that metal blades have.

What I would do, is have an metal tray (I would have used a cake tin), set it inside your larger liquid N2 box, but set it on small blocks of wood to raise the top edge of the metal tray above the level of the liquid N2. Pour in the N2, and allow to cool. It will take quite a while to freeze, and I'm guessing quite a bit of liquid N2.

I think radio shack sells a small hall effect device, that includes instructions on how to build a gauss meter out of it.

You can throw in other reaction mechanisms also, such as fuel cells for hydrogen, and turbines for all combustible fuels.

Didn't see the white shirt bit...I'd have voted for the bleach otherwise.

...I now have a long list of numbers that add to 13 and multiply to give a bunch of stuff. What am I supposed to see that I'm not seeing?

The premise of their idea was that the coolant would be liquid hydrogen, and would thus be used by people as a fuel. Therefore there is no "replacing" the coolant, as it is being cycled through the pipes to consumers. Leaks would be quite a bit more problematic, however.

I was working on a wood working project, while listening to a pirates of the Caribbean soundtrack, when I got a splinter from a piece of birch plywood I was working on. Looking at the edge, I found that I had sanded it quite sharp, although it wasn't anywhere near sharp enough to cut anything beyond cheese. So the idea struck me, how hard would it be to make a wooden sword? I tried birch plywood, and that got a semi decent edge. I just now tried MDF, and that didn't sharpen at all (despite me attempting to fire harden it). The point just disintegrated to sawdust. I think there might be some wood out there that is dense and hard enough to hold a good edge. Any ideas? Preferably available from the local Home Depot/Lowes...

I would imagine that it would have the same effect as eating small amounts of sand or dirt, since both are mostly SiO2. In short, unless the glass bits are big enough to cut, I'd say they are too inert to cause any damage.

I would think that it would be a structure similar to SO3, with one oxygen swapped for a sulfur. I don't think that compound exists though.

I'll leave that one to the theoretical physicists. That level is way above my understanding of things.

blazar hit all of the major points pretty well. I would try some physical activity first. If that makes it worse (as in "my joints are falling apart" worse, not "I'm a bit sore" worse) then take some ibuprofen to see if that helps resolve it. And then go to a doctor. But I heartily agree with blazar's suggestion to get out more.

You lost me

Benadryl is actually sold as a topical gel in pharmacies (OTC).

It doesn't list the sugar content? I suppose you could do a density calculation, or calculate based on the calories....

What exactly are you asking about? A decent intro is here: http://en.wikipedia.org/wiki/Polydactyly

The idea was that excess power (such as at night) from power plants could be used to generate hydrogen, and that this hydrogen could be used as an alternative source of energy at various distributed locations. The idea was to have a few, large centers of hydrogen production, rather than many small ones. That way you minimize the number of energy "transitions" (i.e. heat -> electricity (through grid) -> H2, vs heat -> H2 or heat -> electricity (on site) -> H2). The article mentions using nuclear power to directly crack water using heat, a process not well suited to local production. Or you could just read the article, instead of listening to me mangle it http://www.sciam.com/article.cfm?id=a-power-grid-for-the-hydr-2006-07