Physics for the 21st Century. Course Overview Welcome to Physics for the 21st Century: an on-line course that explores the frontiers of physics.
The 11 units, accompanied by videos, interactive simulations, and a comprehensive Facilitator's Guide, work together to present an overview of key areas of rapidly-advancing knowledge in the field, arranged from the sub-atomic scale to the cosmological. The goal is to make the frontiers of physics accessible to anyone with an inquisitive mind who wants to experience the excitement, probe the mystery, and understand the human aspects of modern physics. About This Course | Using This Site. Physics Documents. TOP TEN UNSOLVED PROBLEMS IN PHYSICS. HyperPhysics.
Margaret Wertheim – The limits of physics. Theoretical physics is beset by a paradox that remains as mysterious today as it was a century ago: at the subatomic level things are simultaneously particles and waves.
Like the duck-rabbit illusion first described in 1899 by the Polish-born American psychologist Joseph Jastrow, subatomic reality appears to us as two different categories of being. But there is another paradox in play. Physics itself is riven by the competing frameworks of quantum theory and general relativity, whose differing descriptions of our world eerily mirror the wave-particle tension. When it comes to the very big and the extremely small, physical reality appears to be not one thing, but two. Where quantum theory describes the subatomic realm as a domain of individual quanta, all jitterbug and jumps, general relativity depicts happenings on the cosmological scale as a stately waltz of smooth flowing space-time. Many physicists are Platonists, at least when they talk to outsiders about their field.
The laws list. Newton's Law of Gravity. Meta Research Bulletin of 6/15/94. The Speed of Gravity – What the Experiments Say Tom Van Flandern Meta Research [as published in Physics Letters A 250:1-11 (1998)] Abstract.
Standard experimental techniques exist to determine the propagation speed of forces. To first order. . , is too small to play a role in explaining this difference in behavior between gravity and ordinary forces of nature. The most amazing thing I was taught as a graduate student of celestial mechanics at Yale in the 1960s was that all gravitational interactions between bodies in all dynamical systems had to be taken as instantaneous. The second objection was that we had all been taught that Einsteins special relativity (SR), an experimentally well-established theory, proved that nothing could propagate in forward time at a speed greater than that of light in a vacuum.
Levitation. Da Vinci's Use of Sacred Geometry. E6-46-01-11. Sacred Geometry International - Unveiling The Ancient Mysteries. Sacred Geometry 101E: Metatron's Cube. VORTEX SACRED GEOMETRY. Sacred Geometry. Sacred Geometry. Sacred Geometry. Dimensional / Sacred Geometry. Fibonacci sacred geometry. Sacred geometry. Sacred Geometry. Learn The History Of Physics In 4 Minutes. Aristotle was wrong.
He claimed that heavier items fell faster than lighter items. Had he actually tested the theory, using a high-tech tool as sophisticated as a ladder, a ledge, or a cliff, he’d have immediately realized that it couldn’t possibly be true. Because Galileo did test the theory, and he found that balls of various mass fell at the exact same rate. And then he skydived off the Leaning Tower of Pisa in celebration just to rub it in Aristotle’s wrong dead face. Well, at least that’s what happened according to this fantastic animation directed by Åsa Lucande for BBC Science.
[Hat tip: neatorama] Physics Activities - Molecular Workbench Showcase. KmeZXh0.jpg (JPEG Image, 550 × 1414 pixels) - Scaled (59. Phys.org - Science News, Technology, Physics, Nanotechnology, Space Science, Earth Science, Medicine. Physics. Physics. Physique. Physique. Physics.
Quantum. One weird theory could make anti-gravity and faster-than-light travel possible. "Famously, physicist John Reed noted in 2006 that some parts of the theory don't yield the exact quantities that Heim claimed they did, only to reverse his opinion the next year and publicly say he believed that Heim was onto something.
" More recently, Reed came to the conclusion that Heim's theory wasn't deriving the particle masses, but using them as inputs and then regurgitating them. (Among other evidence, it gives correct masses for particles whose masses were known in 1947, but not for those discovered later. "I think I have some idea of what Heim did now. (I tried to link to the discussion on physforum where he wrote this, but the comment was flagged as spam.) Portals. Physics. Physics. - StumbleUpon. Flash simulation, Animation, Illustration, Picture, Diagram. Einstein theory of space time dimension confirmed by NASA. Dark matter. Dark matter is invisible.
Based on the effect of gravitational lensing, a ring of dark matter has been detected in this image of a galaxy cluster (CL0024+17) and has been represented in blue.[1] Dark matter is a hypothetical kind of matter that cannot be seen with telescopes but accounts for most of the matter in the universe. The existence and properties of dark matter are inferred from its gravitational effects on visible matter, radiation, and the large-scale structure of the universe. Other than neutrinos, a form of hot dark matter, it has not been detected directly, making it one of the greatest mysteries in modern astrophysics. Astrophysicists hypothesized dark matter because of discrepancies between the mass of large astronomical objects determined from their gravitational effects and the mass calculated from the observable matter (stars, gas, and dust) that they can be seen to contain.
Overview[edit] Baryonic and nonbaryonic dark matter[edit] Observational evidence[edit] Dark Matter & Dark Energy.