[{"data_type":"bookmark","bookmark_url":"http:\/\/www.ageia.com","bookmark_desc":"AGEIA","bookmark_notes":"","ub_date":"1227382542","bookmark_date":"1224592315","tags_str":"computer<\/a>, engine<\/a>, games<\/a>, hardware<\/a>, physics<\/a>, programming<\/a>, simulation<\/a>","se_id":"ageia","user_name":"ppmartin","user_img":"1224435323151.jpg","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/ovablastic.blogspot.com\/2008\/09\/sound-waves.html","bookmark_desc":"Ovablastic: Sound Waves","bookmark_notes":"","ub_date":"1227358169","bookmark_date":"1223453002","tags_str":"audio<\/a>, music<\/a>, physics<\/a>, science<\/a>","se_id":"ovablastic-sound-waves","user_name":"gahlord","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/box2d-js.sourceforge.net","bookmark_desc":"Box2DJS - Physics Engine for JavaScript","bookmark_notes":"Box2DJS is a JavaScript port of Box2D Physics Engine. To tell the truth, this is converted from Box2DFlashAS3_1.4.3.1 in an automatic manner. 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Nevertheless, reading the following instructions is recommended.","ub_date":"1227354885","bookmark_date":"1222417871","tags_str":"applet<\/a>, java<\/a>, physics<\/a>, simulation<\/a>","se_id":"the-lab","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/www.um.es\/fem\/EjsWiki","bookmark_desc":"Easy Java Simulations Wiki | Main \/ Home page","bookmark_notes":"Easy Java Simulations, also known as EJS or Ejs, is an authoring tool written in Java that helps non-programmers create interactive simulations in Java, mainly for teaching or learning purposes. EJS has been created by Francisco Esquembre and is part of the Open Source Physics project.","ub_date":"1227354885","bookmark_date":"1222417871","tags_str":"java<\/a>, opensource<\/a>, physics<\/a>, science<\/a>, simulation<\/a>","se_id":"easy-java-simulations-wiki-main-home-page","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/www.astro.ucla.edu\/~wright\/relatvty.htm","bookmark_desc":"Relativity Tutorial","bookmark_notes":"Relativity can be described using space-time diagrams. Contrary to popular opinion, Einstein did not invent relativity. Galileo preceded him. Aristotle had proposed that moving objects (on the Earth) had a natural tendency to slow down and stop. 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The vector field B depends on the magnitude, direction, length, and proximity of the electric current, and also on a fundamental constant called the magnetic constant. The law is valid in the magnetostatic approximation, and results in a B field consistent with both Amp\u00e8re's circuital law and Gauss's law for magnetism.","ub_date":"1227354883","bookmark_date":"1221859841","tags_str":"maths<\/a>, physics<\/a>","se_id":"biotsavart-law-wikipedia-the-free-encyclopedia","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/son.nasa.gov\/tass\/content\/magnetism.htm","bookmark_desc":"S.O.N. | Content Enhancement | Adventures in Geospace | Magnetism","bookmark_notes":"When two magnets are arranged end-to-end with opposite poles adjacent as shown below, the field lines between the magnets go from the north end of the bottom magnet to the south end of the top magnet. Close to the top magnet, field lines emerge from the north end and connect with the south end. The same is true close to the bottom magnet. However, at a distance, the field from the north of the top magnet connects to the south end of the bottom magnet. It is as if there was only one magnet. bar magnet field This type of connection does not occur when two magnets are arranged end-to-end with opposing poles adjacent (in the case shown below two north poles are adjacent). Between the ends the magnetic fields oppose each other and are forced sharply to the side. To the side of each magnet the field lines curve from north to south, however, the field lines are pushed away from the opposing field becoming flatter near the opposing magnet and bulging away on the far side. bar magnet field","ub_date":"1227354883","bookmark_date":"1221859841","tags_str":"physics<\/a>","se_id":"s-o-n-content-enhancement-adventures-in-geospace-magnetism","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/www.phy.ntnu.edu.tw\/ntnujava\/index.php?topic=181.0","bookmark_desc":"Magnetic field pattern for (line\/ coil\/ solenoid)","bookmark_notes":"You will find magnetic field pattern for a current flow in a vertical wire. Press \"play\", the wire will become a circular current loop. When it \"paused\" again, press \"play\" again. And it will wound in the form of a helix. (solensolid) You can change the Radius R or change the Z-plane to view field distribution at different Z value. 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The contents will be regularly reviewed and updated to reflect advances and developments in the fields of physics and chemistry.","ub_date":"1227354883","bookmark_date":"1221859841","tags_str":"chemistry<\/a>, data<\/a>, physics<\/a>, reference<\/a>, science<\/a>","se_id":"welcome-to-kaye-and-laby-online","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/micro.magnet.fsu.edu\/electromag\/java\/lenzlaw","bookmark_desc":"Molecular Expressions: Electricity and Magnetism - Interactive Java Tutorials: Lenz's Law","bookmark_notes":"","ub_date":"1227354884","bookmark_date":"1221859841","tags_str":"applet<\/a>, java<\/a>, physics<\/a>","se_id":"molecular-expressions-electricity-and-magnetism-interactive-java-tutorials-lenzs-law","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/www.av8n.com\/physics\/loop-de-loop.htm","bookmark_desc":"Interrupted Pendulum, and Loop-De-Loop","bookmark_notes":"We have a string anchored at some point A. At the other end of the string is a small, heavy bob, shown as a black disk in the diagram. This would be an ordinary pendulum, except that the swing is interrupted by a peg at point P.","ub_date":"1227354884","bookmark_date":"1221859841","tags_str":"physics<\/a>","se_id":"interrupted-pendulum-and-loop-de-loop","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/www.chemistry.adelaide.edu.au\/external\/soc-rel\/content\/error.htm","bookmark_desc":"Error","bookmark_notes":"Systematic errors are errors that produce a result that differs from the true value by a fixed amount. These errors result from biases introduced by instrumental method, or human factors. An example of an instrumental bias is an incorrectly calibrated pH meter that shows pH values 0.5 units lower than the true value. An example of a method error would be partial loss of a volatile analyte during the ashing step in graphite furnace atomic absorption (AA) spectroscopy. An example of human bias is a student who records titration endpoints beyond the true endpoint due to color blindness. Systematic errors can be identified and corrected by analyzing standards that closely match the real sample.","ub_date":"1227354884","bookmark_date":"1221859841","tags_str":"chemistry<\/a>, definition<\/a>, physics<\/a>, science<\/a>","se_id":"error","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/www.portalscience.com","bookmark_desc":"Science Directory, Agriculture, Biology, Social Sciences","bookmark_notes":"PortalScience.com offers links to science, biotechnology, physics, astronomy, chemistry, environment, ecology, technology, science resources, social sciences, mechanical engineering, earth sciences, astrophysics, nuclear, molecular.","ub_date":"1221063921","bookmark_date":"1221063918","tags_str":"aerospace<\/a>, agriculture<\/a>, algebra<\/a>, aquaculture<\/a>, astrophysics<\/a>, biodiversity<\/a>, biology<\/a>, biotechnology<\/a>, chemistry<\/a>, directories<\/a>, More...<\/a>","se_id":"science-directory-agriculture-biology-social-sciences","user_name":"thang","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/www.physicstoolkit.com","bookmark_desc":"Physics ToolKit (World-in-Motion)","bookmark_notes":"Physics ToolKit, previously named World-in-Motion, is a useful educational tool for lecture, lab, and student assignments. Features include: * Video analysis software with videos covering common topics in mechanics, sound and electromagnetic fields and waves. * Video capture software with support for VFW, WDM and DX capture devices. * Documents, problem sets and demonstration videos covering common topics in the first year of algebra or calculus based physics courses.","ub_date":"1227354883","bookmark_date":"1218659838","tags_str":"download<\/a>, free<\/a>, physics<\/a>, tools<\/a>, video<\/a>","se_id":"physics-toolkit-world-in-motion","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/www.physicsforums.com\/showthread.php?t=145281","bookmark_desc":"Moment of Inertia of a Rotating Cam","bookmark_notes":"","ub_date":"1227354883","bookmark_date":"1218659838","tags_str":"physics<\/a>","se_id":"moment-of-inertia-of-a-rotating-cam","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/en.wikipedia.org\/wiki\/List_of_moments_of_inertia","bookmark_desc":"List of moments of inertia - Wikipedia, the free encyclopedia","bookmark_notes":"formulae for moments of inertia of various objects","ub_date":"1227354883","bookmark_date":"1218659838","tags_str":"formulae<\/a>, list<\/a>, physics<\/a>","se_id":"list-of-moments-of-inertia-wikipedia-the-free-encyclopedia","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/www.physicsforums.com\/showthread.php?t=54081","bookmark_desc":"derivation of solid sphere moment of inertia","bookmark_notes":"","ub_date":"1227354883","bookmark_date":"1218659838","tags_str":"maths<\/a>, physics<\/a>","se_id":"derivation-of-solid-sphere-moment-of-inertia","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/hypertextbook.com\/physics\/mechanics\/rotational-inertia","bookmark_desc":"Rotational Inertia","bookmark_notes":"how to prove \/ derivate moments of inertia for simple objects (e.g. a disc)","ub_date":"1227354883","bookmark_date":"1218659838","tags_str":"maths<\/a>, physics<\/a>","se_id":"rotational-inertia","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/hyperphysics.phy-astr.gsu.edu\/hbase\/mi.html","bookmark_desc":"Moment of Inertia","bookmark_notes":"","ub_date":"1227354883","bookmark_date":"1218659838","tags_str":"physics<\/a>","se_id":"moment-of-inertia","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/hyperphysics.phy-astr.gsu.edu\/hbase\/top.html","bookmark_desc":"Precession of Top","bookmark_notes":"This process involves a considerable number of physical and mathematical concepts. The angular momentum of the spinning top is given by its moment of inertia times its spin speed but this exercise requires an understanding of it's vector nature. A torque is exerted about an axis through the top's supporting point by the weight of the top acting on its center of mass with a lever arm with respect to that support point. Since torque is equal to the rate of change of angular momentum, this gives a way to relate the torque to the precession process. From the definition of the angle of precession, the rate of change of the precession angle q can be expressed in terms of the rate of change of angular momentum and hence in terms of the torque.","ub_date":"1227354883","bookmark_date":"1218659838","tags_str":"maths<\/a>, physics<\/a>","se_id":"precession-of-top","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/en.wikipedia.org\/wiki\/Precess","bookmark_desc":"Precession - Wikipedia, the free encyclopedia","bookmark_notes":"Torque-induced precession (gyroscopic precession) is the phenomenon in which the axis of a spinning object (e.g. a part of a gyroscope) \"wobbles\" when a torque is applied to it. 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A simple model of synchronization is proposed.\n Keywords: synchronization, nonlinear dynamics","ub_date":"1227354883","bookmark_date":"1216631441","tags_str":"physics<\/a>, synchronisation<\/a>","se_id":"huygens-clocks","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/www.physics.gatech.edu\/schatz\/clocks.html","bookmark_desc":"Huygens' Clocks","bookmark_notes":"In 1657, Christiaan Huygens revolutionized the measurement of time by creating the first working pendulum clock. In early 1665, Huygens discovered ``..an odd kind of sympathy perceived by him in these watches [two pendulum clocks] suspended by the side of each other.'' The pendulum clocks swung with exactly the same frequency and 180 degrees out of phase; when the pendulums were disturbed, the antiphase state was restored within a half-hour and persisted indefinitely. Huygens deduced that the crucial interaction for this effect came from ``imperceptible movements'' of the common frame supporting the two clocks. He thought this synchronization could be used to provide the exquisite timing necessary to solve the famous ``longitude problem'' in maritime navigation and spent many years developing and testing designs for pendulum clocks that function at sea.","ub_date":"1227354883","bookmark_date":"1216631441","tags_str":"physics<\/a>, synchronisation<\/a>","se_id":"huygens-clocks-92493","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/salt.uaa.alaska.edu\/dept\/metro.html","bookmark_desc":"Synchronization of Metronomes","bookmark_notes":"A version of Huygens original system provides an elegant classroom demonstration of how systems synchronize. The system consists of two pendulum metronomes resting on a light wooden board which sits on two empty soda cans, see picture above. The metronomes used are Wittner's Super-Mini-Taktell (Series 880), and were chosen because they were inexpensive and had a light base. The base supports were empty beverage containers (Mountain Dew, 12 fl. oz).","ub_date":"1227354883","bookmark_date":"1216631441","tags_str":"physics<\/a>, synchronisation<\/a>","se_id":"synchronization-of-metronomes","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/ww2.slcc.edu\/schools\/hum_sci\/physics\/tutor\/2220\/e_flux","bookmark_desc":"Physics Tutoring: Electric Flux","bookmark_notes":"","ub_date":"1227354883","bookmark_date":"1216631441","tags_str":"electricity<\/a>, physics<\/a>","se_id":"physics-tutoring-electric-flux","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/hyperphysics.phy-astr.gsu.edu\/hbase\/electric\/resis.html","bookmark_desc":"Resistance and Resistivity","bookmark_notes":"","ub_date":"1227354883","bookmark_date":"1216631441","tags_str":"electricity<\/a>, physics<\/a>","se_id":"resistance-and-resistivity","user_name":"davidar","user_img":"","user_count":"1"},{"data_type":"bookmark","bookmark_url":"http:\/\/www.ce-mag.com\/archive\/2000\/marapril\/mrstatic.html","bookmark_desc":"How Fast Does a Charge Decay?","bookmark_notes":"There's a phrase that has been bothering me for years: \"How do you remove static electricity?\" At one level the question makes sense. 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