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John Cuthber

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Everything posted by John Cuthber

  1. Incidentally, it's sometimes possible to make alloys by electroplating them out of a mixture of metal compounds but this doesn't usually work well. Usually one metal comes out fist then the other.
  2. John Cuthber

    Real ID

    Not quite the same thing but I think it's important to remember that such data needs to be kept securely. If a government can't look after things they shouldnt (imho) collect them. http://news.bbc.co.uk/1/hi/uk_politics/7103566.stm
  3. "Should I be alarmed of this? " Well the study they report shows an increased likelyhood of having a stroke if you have taken PPA in the last 3 days. Beyond that time, presumably, the effect was too small to measure. Also while the odds ratio got as high as 15 to 1 in some cases you have to remember that making something very rare 15 times commoner still leaves it rare. Since there are other drugs with comparable effects and less risk it makes sense to switch to them.
  4. OK, draw me a diagram and show me the "C with 3 bonds to other carbons".
  5. I doubt anyone uses xenon. Argon is a whole lot cheaper.
  6. Well, I think th e9.5Ma is about right. It's not amps per day though, it's just amps. That current has to flow to get 270T/day of copper. Since the cell voltage is 2V the easy way to calculate the power is to use the power = current times voltage and so you get 2 V times 9500000 A = 19000000 W That's 19 megawatts of power. Rather more than a couple of light bulbs. Your experimental data would, siimilarly give a little over 20 MW as the power required.
  7. John Cuthber


    Please let me know what parameters I need to tell you about this uranium atom (it's in a jar on my bench) so you can tell me when it will decay.
  8. HF is used to dissolve rocks for analysis because it disolves silica. You don't need to do that so, as has been said, treating the (crushed) rock with HCl will leach out most of the metals. Then it's a matter of cleaning up the Mg from the other metals and measuring it (and that's relatively straightforward analysis).
  9. The "easy" way to implement this with the required accuracy would be to make a normal mirror and run the small mirror back and to across it's surface. Let me know if anyone finds a point to doing that. Seriously, it's going to be a lot easier to make a static mirror that has the requred accuracy than to make a set of rails to run the small mirror on which retain their accuracy under the changing load of the moving mirror. Then you have to figure out how to rotate it or you just get a line in the sky rather than a circle.
  10. I rather suspect that quite a lot of incest is brother/ sister and as well consented as youngster's sexual relations ever are. If they are roughly the same age then paedophillia doesn't eneter into the debate. How in the name of comon sense anyone is going to enforce condom use is beyond my imagination. A policeman in the bedroom? Another for the back of the car and the kitchen table? Since the contraception is unenforceable there will be children born. The excess risk of genetic defects in these children makes them the victims.
  11. When Mr Mongoose gets bored of the pretty colours he can measure the electrical conductivity of a flame too. Anyway, since any flames are very much hotter than the air round them they are bouyant. Their weight, as measured in air, would be negative.
  12. Spoken like a man with a water pistol. ;-) On the other hand, hydrostatics is where it might answer the original poster's question.
  13. Buy it. Though, since vuinegar is about 95% water, it's not very ecconomical
  14. The only people who could help you do this safely would be bound by professional ethics not to do so (with the arguable exception of a heroin user who is going to do it anyway). A clipped needle would, as has been sugested, be a pretty good fake. Any remaining errors with the image could be photoshopped.
  15. I will be dead before the sun goes out. It is predicted to happen so far in the future that mankind as we know it will probably have evolved into something else (or died out). A xenon arc lamp does a pretty good job of mimicing sunlight.
  16. OK, here's a quote from that site."force F by which the two material bodies Α and Β attract one another always depends on their material composition, and this force F is never independent of the bodies’ material composition, as Newton states in his first law of universal gravitation." It's demonstrably false- rocks of different compositions and artificial satelites orbit in the same way (ie at same speed for any given distance). Incidentally, it's difficult to say how right or wrong Newton is since he's dead- like this theory.
  17. (side)^(n+1) note Tin can also act as a semiconductor or a superconductor.
  18. Fair point. On the other hand since it doesn't melt unless you heat it to 95C and doesn't boil much below 300 I don't think it's the active ingredient for sniffing anything. Also I simply don't see any references anywhere to it working as a drug. On the other hand, it's a food additive. http://www.chm.bris.ac.uk/motm/skatole/skatolec.htm
  19. Last I heard air transport of Ga was simply banned to avoid this problem.
  20. Each Cr(VI) takes 3 electrons to become Cr(III) It only takes the removal of one to turn an Fe(II) into Fe(III) Each dichromate has 2 Cr atoms. How many Fe(II) does it take to supply the elctrons needed to reduce a molecule of K2Cr2O7?
  21. "Here are a few more scientists that don't agree with mainstream science on this issue" Define "scientist".
  22. Oxygen deprivation will upset the brain and might be responsible for this "effect". Skatole is interesting enough stuff but not an halucinogen. Since out guts produce it all the time we would always be "high".
  23. "Is it true that fluids under pressure always rotate in a counterclockwise direction?" Well, if they rotate then yes. Anything that rotates goes clockwise and anti clockwise depending on how you look at it. However, there's no real requirement for them to rotate (noticably) even on the rotating earth.
  24. Yes, you can and they do. In particular it's used to measure ozone but it's used for a lot of other things like measuring along the perimeter of a manufacturing site so they know if there's a leak. The ozone measurements are UV I think but a lot of other stuff is done with IR. None of these seem to be a chemical nose to me because my nose isn't a hundred metres long.
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