XII Physics :: Some useful downloads and links http://goo.gl/fb/HzJ4z – Plus Two Physics (plustwophysics) http://twitter.com/plustwophysics/status/32230592913342464
An anemometer looks like a weather vane, but instead of measuring which direction the wind is blowing with pointers, it has four cups so that it can more accurately measure wind speed. Each cup is attached to the end of a horizontal arm, each of which is mounted on a central axis, like spokes on a wheel. When wind pushes into the cups, they rotate the axis. The faster the wind, the faster the cups spin the axis.
What kind of power would you need to overcome this obstacle? Why is this such a difficult thing to do? Well, a ninja trying to climb this ladder not only has to do something like a pull-up (no easy feat) he has to end the pull-up with enough vertical velocity so that he can be “airborne” long enough for him to move the bar to the next level. Really, this is the part that makes it tough and this is the part that I want to calculate the power for. Let’s go.
Stereoscopic visualization is seldom used in Astrophysical publications and presentations compared to other scientific fields, e.g., Biochemistry, where it has been recognized as a valuable tool for decades.
@eufisica Thank you very much for RT. I share this from Universe Today http://t.co/gf1uP1H – ChiliDog Observatory (CCantuQ) http://twitter.com/CCantuQ/status/95262242865561600
For sure you do remember that poster from your classroom with all the chemical elements ordered in the so-called periodic table. But, certainly only a few of you will have heard about Henry Moseley and his concept of the atomic numbers.
This site provides a free physics textbook that tells the story of how it became possible, after 2500 years of exploration, to answer such questions. The book is written for the curious: it is entertaining, surprising and challenging on every page.
The NOVA mini-series The Elegant Universe, watch all three one hour episodes here, divided into chapters, available in the QuickTime or RealPlayer plug-ins.
an open source, high performance library for simulating rigid body dynamics. It is fully featured, stable, mature and platform independent with an easy to use C/C++ API. It has advanced joint types and integrated collision detection with friction.
When in 1952 the world's first thermonuclear fusion bomb was ignited, mathematicians and physicists thought it would be rather unlikely that testing the device might result in burning all the nitrogen in the earth's atmosphere. But, the possibility could not be excluded completely. Nevertheless, they have tested the bomb and fortunately for us not the like did happen. One of the key persons behind the development of the hydrogenic bomb was Stanislaw Ulam, who together with physicist Edward Teller came up with the first successful design.
This essay is about two properties that some theories of physics have — determinism and locality — and the gaps that can exist between how they are understood as properties of physical reality, how they are understood as properties of mathematical theories, and how they are formally defined as properties of mathematical theories. I will point out one such gap that seems to have gone widely unremarked, and that could admit an interesting class of physical theories. On the other hand, for readers already well acquainted with Bell's Theorem, it may be helpful to know up front that, ultimately, I will identify a particular class of mathematical theories that have a sort of locality —mathematical locality, but not apparently physical locality— but that do not satisfy the assumptions of the Theorem and therefore are not constrained by Bell's Inequality (and no, this is not related to Joy Christian's work; I'm going to take an orthodox view of Bell's Theorem).
Founded in 1887 Zeitschrift für Physikalische Chemie covers the main developments in physical chemistry with emphasis on experimental research. It represents a combination of reaction kinetics and spectroscopy, surface research and electrochemistry, thermodynamics and structure analysis of matter in its various conditions.
by Jason - Color theory, "Four primary colors? Yes, why not? It’s the closest thing to the actual physiology without getting complex." (some pertinent info here http://news.ycombinator.com/item?id=2166494)
by Richard Walters ("For the People" magazine) "Physicist Bruce DePalma has a 100 kilowatt generator, which he invented, sitting in his garage. It could power his whole house, but if he turns it on, the government may confiscate it. "
From the invention of a new power source or engine up to a vehicle that applies this power source to move forward sometimes is only a small step. But, to become a commercial success, this step might take even decades. Just think of the oldest type of engine powered by steam.
Sir Fred Hoyle, born in 1915 was a famous astronomer, mathematician, and author. The scientist was the first to coin the term "Big Bang" for the now prevailing theory of the early development of the universe in 1949, even though he happened to be a strong opponent of this theory.
an online academic journal accepting publications on any subject. Philica takes a completely revolutionary approach to the publishing and reviewing of academic research. The instant, open-access Journal of Everything
provides direct links to over 7000 scholarly periodicals which allow some or all of their online content to be viewed by ANYONE with Internet access for free