Recent content by truman

How quickly can uranium be enriched from 20% to 80% U235 using gas centrifuges? It seems that the time required would increase exponentially for every linear unit increase in 'purity'. Or, it would require an exponential increase in the number of centrifuges to produce a linear purity/time...

How much of this effect can be accounted for by rapidly heated air expanding around the arc and disrupting the flame?

I've only had calc based phyics, I&II. We did not do optics or relativity, just mechanics and some e&m, and motion. I wanted to review those subjects, do optics and (basic) relativity, basically this whole text. I just don't want to get to a new school and instead of deriving a very basic...

Am I being lulled by a basic text? I am re-studying basic physics and calculus for a run at a physics degree. I am using the Stewart text for calculus and I find it challenging. I am using the Young and Freedman physics text, and I find the calculus-based portions incredibly basic. I am...

Is lack of understanding of basic science (and/or an effort to sabotage the public school science curriculum) a deal breaker for you? Yes.

I agree with CAC1001, and there also is the answer to the OP. If the masses really did control the US (and that's how things have been heading), you'd have the mess we are in now. The worst possible outcome for the US would be control by Facebook. The OP was correct when he alluded to idiots...

China's GDP, measured in a number of ways, may surpass ours by 2040 (or 2016 at worst according to recent interactive tools on another website), but their economic power, what I think the OP was asking about, is unlikely to overtake the US's in the foreseeable future. China cannot command the...

Yes, I see. You have to substitute in the variable and then it's squared, removing the square root sign. Brain fart. Thank you!

Homework Statement I am doing self-study. I am on problem 5.6 #27 in the Stewart text 3rd E. I don't understand why the integration limits changed after the given substitution. The given substitution was: x=θ^2 dx=2θdθ Homework Equations Please see attachment. The Attempt at...