Beginners Guide to Aerodynamics

At this Web site you can study aerodynamics at your own pace and to your own level of interest. Some of the topics included are: Newton's basic equations of motion; the motion of a free falling object, that neglects the effects of aerodynamics; the terminal velocity of a falling object subject to both weight and air resistance; the three forces (lift, drag, and weight) that act on a glider; and finally, the four forces that act on a powered airplane. Because aerodynamics involves both the motion of the object and the reaction of the air, there are several pages devoted to basic gas properties and how those properties change through the atmosphere. This site was created at NASA Glenn as part of the Learning Technologies Project (LTP). There is a special section of the Beginner's Guide which deals with compressible, or high speed, aerodynamics. This site has been intentionally organized to mirror the unstructured nature of the world wide web. Activities: Navigation..

Scientists discover most accurate clocks in the universe Time in space has always been an elusive issue for scientists who have long struggled to find a constant standard. But a new discovery may help us understand time as never before. Space.com reports that scientists are now using pulsars — rapidly spinning stars that pulse over time — to tell the universe’s time. A pulsar is a rotating neutron star that emits a beam of electromagnetic radiation. It seems that these super heavy lighthouses of the universe are also predictable and steady in their actions. Why is constant time in the universe important? Further, experts hope that this new clock can help solve at least one space mystery. For further reading: Pulsing stars may be most accurate clocks in the universe

THE SCIENTIFIC METHOD: Practical Help With Everyday Problems & Decisions The full SM-14 formula, which you have just read, is usually for complex, ill-structured problems that require research and study. However, problems come in a variety of complexities. Here is a shortened formula: SM-7 For Intermediate-Type Problems and Decisions (Can also be used as a preliminary or introduction to teaching the full SM-14 formula) Instantaneous Decisions and Problem Solutions In the course of a day you make hundreds of simple decisions and problem solutions, usually based on your intuition. Many of these solutions and decisions are really simple, unimportant, and in the habit-type class. Others are of varied importance that you make instantly because of time frames, a good-enough answer will suffice, or you have self-confidence in your intuition. Since some may be important, too many errors can hurt your success, relationships, or reputation. “Man is a problem-solving, skill-using, social animal.”

Is Time Disappearing from the Universe? (A Weekend Feature) Scientists previously have measured the light from distant exploding stars to show that the universe is expanding at an accelerating rate. They assumed that these supernovae are spreading apart faster as the universe ages. Physicists also assumed that a kind of anti-gravitational force must be driving the galaxies apart, and started to call this unidentified force "dark energy". The idea that time itself could cease to be in billions of years - and everything will grind to a halt - has been proposed by Professor José Senovilla, Marc Mars and Raül Vera of the University of the Basque Country, Bilbao, and University of Salamanca, Spain. The corollary to this radical end to time itself is an alternative explanation for "dark energy" - the mysterious antigravitational force that has been suggested to explain a cosmic phenomenon that has baffled scientists. However, to this day no one actually knows what dark energy is, or where it comes from.

LHC closes in on massive particle 23 July 2010Last updated at 20:33 By Paul Rincon Science reporter, BBC News, Paris CMS is one of two "multi-purpose" experiments housed at the LHC Physicists at the Large Hadron Collider (LHC) have seen several candidates for the heaviest elementary particle known to science. If the observations are confirmed, it would be a first for Europe; so far, the top quark particle has only been generated by one lab in the US. Dr Arnaud Lucotte said the discovery could assist physicists in the hunt for the elusive Higgs boson, or "God particle". Details of the top quark candidates were presented at a major particle physics conference in Paris. The International Conference on High Energy Physics (ICHEP) runs from 22-28 July. The Large Hadron Collider is operated by the European Organization for Nuclear Research (Cern), based in Geneva. The LHC is a giant accelerator machine housed in a 27km-long (17 miles) tunnel under the French-Swiss border. 'Striking event' Hunting the Higgs