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A very interesting animation of Faraday´s Magnetic Induction and Lenz´s Laws. A circular metallic ring is located in a region with an uniform external magnetic field. First, the ring is located in a plane perpendicular to the external field lines and the intensity of the field is increased, so the induced current on the ring and its corresponding field lines are shown. Then the ring is rotated and the corresponding induced currenta and field lines are presented.
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This video and animation illustrate Faraday's Law. As a permanent magnet is moved back and forth in the vacinity of a coil of conducting wire, a current is induced in the coil (as measured by the ammeter in the video). This induced current is proportional to the rate of change of magnetic flux through the enclosed area of the coil, and flows in such a direction as to generate a field whose change in flux opposes that change. In the animation, we show the evolution of the magnetic field during this process.
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Moderator William Uricchio sets the scene for panelists’ discussion of current copyright wars with a brief historical overview of copyright protection. In 1790, when news traveled by horse and carriage, copyright protection was good for 14 years. Today, when a digital, networked society enables instant transmission of data, protection lasts 70-plus years. Uricchio notes, “Bizarrely, the faster information circulates, the longer we’re extending copyright protection. It seems totally at odds with where our constitution framers and case law emerged from.”
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Many mechanical examples of Newton's laws of motion and the nature of our 'clockwork' universe are be demonstrated. These laws have enabled us to venture out into space and explore other worlds. The Voyager Mission to the outer planets are examined, and the slingshot effect, which enabled the Voyager spacecraft to reach their destinations in a fraction of the time taken by a direct route, will be explained and demonstrated. Finally, how likely are we to reach our nearest star in this millennium?
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Armed with a sense of humor and laypeople's terms, Nobel winner Murray Gell-Mann drops some knowledge on TEDsters about particle physics, asking questions like, Are elegant equations more likely to be right than inelegant ones?
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This course is intended as an introduction to political philosophy as seen through an examination of some of the major texts and thinkers of the Western political tradition. Three broad themes that are central to understanding political life are focused upon: the polis experience (Plato, Aristotle), the sovereign state (Machiavelli, Hobbes), constitutional government (Locke), and democracy (Rousseau, Tocqueville). The way in which different political philosophies have given expression to various forms of political institutions and our ways of life are examined throughout the course
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Jean-Robert Câdet lost his childhood, when at the age of four, he became a slave to a rich Port-au-Prince family. After years of washing floors, fetching water, and sleeping under the kitchen table, he found freedom when his owners moved to the U.S., and kicked him out. Câdet, who says the “biggest part was the emotional detachment,” wonders today why the U.S., Haiti’s biggest foreign donor, doesn’t “link foreign aid to the elimination of slavery.”
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Before buying your next chocolate bar or sweatshirt, bear in mind its potential hidden cost: the forced labor of an impoverished worker. According to a recent International Labor Organization report, 12.3 million people from developing countries toil miserably to produce goods and services for industrialized nations. One after another, speakers on this panel reveal the astonishing pervasiveness of modern-day slavery, on which, it seems, the entire global economy now depends.
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