Atomic Structure An updated version of this lesson is available at Visionlearning: Atomic Theory & Ions & Isotopes In the last lesson we learned that atoms were particles of elements, substances that could not be broken down further. In examining atomic structure though, we have to clarify this statement. An atom cannot be broken down further without changing the chemical nature of the substance. For example, if you have 1 ton, 1 gram or 1 atom of oxygen, all of these units have the same properties. We can break down the atom of oxygen into smaller particles, however, when we do the atom looses its chemical properties. Atoms are made up of 3 types of particles , and . A neutron walked into a bar and asked how much for a drink. The bartender replied, "for you, no charge." -Jaime - Internet Chemistry Jokes The atom above, made up of one proton and one electron, is called hydrogen (the abbreviation for hydrogen is H). Keep in mind that atoms are extremely small. As you can see, helium is larger than hydrogen.
BBC Space – Explore the planets, black holes, stars and more 10 Strange Things About The Universe Space The universe can be a very strange place. While groundbreaking ideas such as quantum theory, relativity and even the Earth going around the Sun might be commonly accepted now, science still continues to show that the universe contains things you might find it difficult to believe, and even more difficult to get your head around. Theoretically, the lowest temperature that can be achieved is absolute zero, exactly ? One of the properties of a negative-energy vacuum is that light actually travels faster in it than it does in a normal vacuum, something that may one day allow people to travel faster than the speed of light in a kind of negative-energy vacuum bubble. One prediction of Einstein’s theory of general relativity is that when a large object moves, it drags the space-time around it, causing nearby objects to be pulled along as well. Relativity of Simultaneity Since this extra dimension is so small, only tiny objects, such as particles, can move along it. Antimatter Retrocausality
Supermassive Black Hole Sagittarius A* Supermassive Black Hole Sagittarius A* This image from NASA's Chandra X-ray Observatory shows the center of our Galaxy, with a supermassive black hole known as Sagittarius A* (Sgr A* for short) in the center. Using intermittent observations over several years, Chandra has detected X-ray flares about once a day from Sgr A*. The flares have also been seen in infrared data from ESO's Very Large Telescope in Chile. A new study provides a possible explanation for the mysterious flares. The suggestion is that there is a cloud around Sgr A* containing hundreds of trillions of asteroids and comets , which have been stripped from their parent stars. An asteroid that undergoes a close encounter with another object, such as a star or planet, can be thrown into an orbit headed towards Sgr A*, as seen in a series of artist's illustrations beginning with the top-right panel. Another solar system analogy for this type of event has recently been reported. Credits: X-ray: NASA/CXC/MIT/F.
Skandal u Novom Pazaru: Transparent "Živela žuta kuća!" D. Nikolić | 24. 10. 2012. - 20:31h | Foto: Srpskatribina.net, FoNet | Komentara: 379 Nezapamćen skandal desio se u Novom Pazaru tokom meča osmine finala Kupa Srbije u fudbalu u kome je istoimenom Superligašu gostovao beogradski Rad: navijači domaće ekipe raširili su transparent "Živela žuta kuća", sa jasnom aluzijom na lokaciju gde su, prema izveštaju specijalnog izvestioca Saveta Evrope Dika Martija, tokom ratnih sukoba 1999. godine, pa sve do sredine 2000. godine, vađeni organi oko 300 Srba a potom prodavani širom Evrope. Parola navijača Novog Pazara na Kup duelu sa Radom: "Rešen rebus: srce, bubreg, pluća - živela žuta kuća" Ponašanje navijača Novog Pazara, stacioniranih iznad zastave "Ekstremi", što govori da se radi o ovoj frakciji navijača novopazarskog kluba, ma koliko bilo šokantno, ima i "objašnjenje". Navijači Rada na utakmici sa Novim Pazarom, prošle sezone na Banjici.
5 Really Weird Things About Water Water, good ol' H2O, seems like a pretty simple substance to you and me. But in reality, water - the foundation of life and most common of liquid - is really weird and scientists actually don't completely understand how water works. Here are 5 really weird things about water: 1. Hot Water Freezes Faster Than Cold Water Take two pails of water; fill one with hot water and the other one with cold water, and put them in the freezer. In 1963, a Tanzanian high-school student named Erasto B. Thankfully, Mpemba didn't back down - he convinced a physics professor to conduct an experiment which eventually confirmed his observations: in certain conditions, hot water indeed freezes before cold water*. Actually, Mpemba was in good company. But how do scientists explain this strange phenomenon? 2. Everybody knows that when you cool water to 0 °C (32 °F) it forms ice ... except that in some cases it doesn't! Note: Similarly, superheated water remains liquid even when heated past its boiling point. 3. 4.
Physique moderne et philosophie [Podcast] - Centre Atlantique de Philosophie Vincent Jullien et Bruno Gnassounou organisent deux conférences présentées par deux jeunes chercheurs en physique et/ou philosophie sur des questions philosophiques de la physique contemporaine. Qu’est-ce qu’un modèle en physique ? Mardi 16 mars 16h30, Salle 334, Campus du Tertre. Comment l’utilise-t-on et quelles sont ses limites ? Podcast Conférence de Manuel Combes au Centre Atlantique de Philosophie : télécharger ce mp3 Vous trouverez ci-dessous les diaporamas utilisés par Manuel Combes lors de sa conférence. Une introduction aux enjeux philosophiques en mécanique quantique Mardi 30 Mars 16h30, Salle 334, Campus du Tertre. La mécanique quantique est la théorie physique actuelle qui rend compte des phénomènes atomiques. Conférence de Thomas Boyer au Centre Atlantique de Philosophie : télécharger ce mp3 Vous trouverez ci-dessous le diaporama utilisé par Thomas Boyer lors de sa conférence.
Physics Formulary: Table of Contents Last change: December 16, 2009 This document is a LaTeX file of 108 pages which contains a lot of equations in physics. It is written at advanced undergraduate/postgraduate level. A list of recent additions and improvements is available. Download options physics.tex: an English LaTeX file (Approximately 310kb). physics.zip: a zipped English LaTeX file (Approximately 100kb). Equations in physics - Contents The table of contents from "Equations in Physics" is shown below. Physical Constants 1 1. Sally Ride, la primera estadounidense en el espacio No había entonces techo más alto que el de las estrellas, y Sally Ride ayudó a romperlo, como la primera mujer norteamericana en viajar al espacio, a bordo del transbordador espacial Challenger, en 1983, cuando contaba sólo con 32 años. Fue, además, la astronauta más joven en órbita, en una época dorada de la aviación espacial. Falleció el lunes, en su hogar de San Diego, a los 61 años, después de una larga lucha contra un cáncer de páncreas, según anunció la fundación Sally Ride Science. Nacida en Los Ángeles en 1951, Ride se doctoró en física y fue aceptada en la NASA en 1978 de una forma que ahora resulta poco común: respondió a un anuncio de periódico en el que se pedían astronautas. La primera mujer en órbita había sido Valentina Tereshkova, enviada a bordo de la misión soviética Vostok 6 en 1963. Feministas de todo occidente la saludaron entonces como a toda una pionera. Ride se consideraba una feminista. El oprobio era, en cierto modo, inevitable.