Recent content by CleffedUp

Variances of "Physics" on Earth This is a question on the dynamic nature of the human experience of physics on Earth. The Earth orbits the Sun, the Sun and our solar system are moving in some sense (at least with respect to the expansion of the universe), and the entire universe is acting...

Probability that Z=117 becomes Ignobelum is now > 0. My greatest contribution to science to-date (I'm getting there!).

Hi all, I was wondering if you social science types have a particular canon or other good reference for sound survey design, i.e. minimizing confounding factors. Good sources on experimental design, in general, are also welcome. I'd rather learn to fish than just have takeout, but the survey...

This isn't a homework question, but seemed sufficiently low-level that it belonged in this part of the forum. When one speaks of "common" oxidation states, what is meant by "common?" Is this simply to say the states most commonly occurring in nature? This would be opposed to most commonly...

...binding implies "slower," and m = e/c^2, so m is lower! Makes sense. Thanks CT. I'll go off and Google for a deeper understanding.

Interesting. Any suggestions for further reading? Google terms other than "aqueous silica solution"?

I'm not sure this meets your requirements, but it seems to me that if you know the densities of silica and water you should be able to figure out the concentration of a solution to a reasonable precision with a cylinder, a scale, and a calculator.

One postscript: One thing I still don't understand though is why I couldn't come to this answer by multiplying amu by the particle values, e.g. Br-81 = 35p * 1.0073 + 46n * 1.0087 + 35e * 0.0005 = 81.6732 != 80.92

First off, thanks for all the replies. All that was given is listed under the question, and the textbook answer is the precise mass of the other isotope, so plugging in 81 as y doesn't cut it. If you do the algebra, you get 78.84, which does tell you the other is probably Br-79, but this...

Homework Statement The atomic weight of bromine is 79.904. The natural abundance of Br-81 is 49.31%. What is the atomic weight of the only other natural isotope of bromine? Z = 35 Homework Equations The answer is 78.92 amu (Br-79) and Br-81 happens to be 80.92 amu. The Attempt at...

Sure the most exciting early milestone will be the first collision, but it's still a milestone. The opening pitch of a baseball game doesn't usually mean much, but spectators cheer it just the same, excited about what's to come. This is also the first opportunity to learn more about the...

I found another feed on an Irish news site: http://www.rte.ie/live/ They have some well-informed commentators, which is probably an upgrade over the raw CERN feed. They explain the monitors and you get into the workings of the devices at a useful level of detail. This is CSPAN-esque, but...

Yeah, ain't WHOIS grand? ;)

Is this site legit? I haven't been able to find public dates for anything, and this site doesn't seem even remotely affiliated with CERN. For all the significance of the LHC, there seems to be a severe lack of public information about what's actually going on, especially this late in the game.

I don't think anyone has mentioned what is probably the single most dramatic and controversial invention in the history of man: The atomic bomb. Do a search in Google (+"atomic bomb" +einstein) and you get some 300k hits, even though he had nothing directly to do with it. I don't have the...