# Recent content by kevinalm

1. ### Electromagnetic radiation

Pit vipers, for example the rattlesnake. The pits are cavities with a heat sensitive lining. Works like a pinhole camera of sorts. The resolution isn't very good but they do seem to be able to direct a strike at warm blooded prey. I don't think any of the constrictors have pits.
2. ### Force exerted by moving air?

Obviously yes, but from the way your question is worded you are looking for a simple formula. There is none. The force air exerts on an object is extremely dependant on the way air flows around it. That means the shape of the object is very important. If you're really interested, find some good...
3. ### Field Constants

I don't know. I was explaining a minor point of _Newtonian_gravitation_ and found myself dodging black holes, parahelion precession and gravitational radiation. Geez. :biggrin: Sorry if I offended anyone. I hope in all this mess the op found a satisfactory answer to his original question(s).
4. ### DREAD weapon system, power requirements

Dimpling actually reduces drag. That's why they do it to golf balls. (Which is what I still say is what the picture is.) They induce a small amount of turbulance, which while on it own would increase drag, has the overall effect of altering the stream flow into a more efficient pattern. Tests...
5. ### DREAD weapon system, power requirements

Kind of gives a whole new perspective to the term "fail deadly" , doesn't it?
6. ### Field Constants

I think you misundersood me. The question was asked why gravitation uses a composite G variable while em uses 1/(4*pi*e0). I essentially answered that it was convenient for em to do so while in gravitation it isn't particularly helpfull as you just demonstrated. In em e0 is used for relating a...
7. ### Field Constants

Sorry, I should have been more clear. The point I was trying to get across was in Newtonian physics there is no particular incentive to write it in the form 1/(4*pi*g0), so the original poster won't find a g0 in any textbook he is likely to be studying. Gauss's law is inherent in the form of the...
8. ### Field Constants

I almost mentioned general relativity, but I didn't want to confuse the issue. In em the form of Maxwell's equations makes e0 useful. There is no incentive for g0, in fact I've never seen it outside of some tinkering I did when I first asked the same question you did.
9. ### Field Constants

Gravity's 1/(4*pi) *g0 =G , it's embedded in the gravitational constant. Gravitation flux doesn't have anything similar to em induction (relating a changing E field to an B field and vice versa as in Maxwells equations) so it isn't particularly useful to write it out that way.
10. ### To verify the estimated mass of a neutron

There is a large disparity in mass between the Au nucleus on the one hand and the alpha particle and neutron on the other. A case of a marble wacking into a stationary bowling (sticking?) and knocking out a pea sized peice of the bowling ball. So couldn't it be approximated by the momentum of...
11. ### Field Constants

It's really just a scaling factor, needed because of the arbitary nature of systems of units. It relates the E field intensity units to the unit of force and the unit of charge. The numeric value depends on the system of units chosen. (MKS, ft-lb-slug, etc.) >>edit I should clarify what I...
12. ### Bubble Chamber

Glad to help. By the way, did you ever hear the story of how the bubble chamber was invented. Particle physists had run into a problem in that cloud chambers weren't accumlating enough collision events (a particle actually striking a nucleus) due to the high energies of the particles and the low...
13. ### Bubble Chamber

Depends on what you mean by ionizing powers. If they have equal energy then yes they will create roughly the same total number of ions as each slows to a stop. But a neutron takes longer to slow than a proton, no charge to strip electrons from atoms near its path. A neutron does have a magnetic...
14. ### Bubble Chamber

I see what you mean. Iirc, most (perhaps all) neutral particles don't leave an ionization trail strong enough to trigger a bubble trail. They don't interact with the liquid strongly enough.
15. ### DREAD weapon system, power requirements

I think I see what your getting at. A washing machine acheives a dynamic balence by allowing the "rotor" axis to move in a small circle, as veiwed from on top. (Sighting straight down along the axis) This has also been used to stabilize the wheels on cars and on internal combustion engines and...