block diagram
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In this lecture Processor Lewin introduces elasticity and Young's modulus. The fractional length deformation of a material (the strain) depends on the force per unit area (the stress). The stress vs. strain dependence is described conceptually, then explored empirically. The speed of sound in a material depends on the stiffness and density of the material; from this follows the fundamental frequency at which a rod resonates. Professor Lewi...more
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Figuring out configurations for the d-block elements.
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This lecture deals exclusively with frictional forces. Starting with a block at rest on a horizontal surface, Professor Lewin describes the normal force, the maximum frictional force that must be overcome to budge the block, and the coefficient of static friction. He continues to make measurements of the coefficient of static friction, and presents ways to reduce friction using hydroplanes and air tracks. Even a flea can move a very heavy...more
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Jennifer Raymond (Stanford University) is building a "wiring diagram" for the brain. By bridging the gap between individual synapses and whole-brain learning & memory, Raymond's research offers new insights and strategies for medical rehabilitation and K-12 education.
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Double Newman Diagram for Methcyclohexane.
