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Khan Academy: 2757 products

Khan Academy is an organization on a mission. We're a not-for-profit with the goal of changing education for the better by providing a free world-class education for anyone anywhere. All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get …

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Organic chemistry: Stabilization of a conjugate base: electronegativity

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How electronegativity affects the stabilization of a conjugate base (when comparing elements in the same period) Organic chemistry Sal and …

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Physics: Mach numbers

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We can measure speeds relative to the speed of sound Physics Learn about the basic principles that govern the physical world around us. Sol…

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Class 12 Physics (India): Electric motors (part 3)

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Sal finishes the explanation of how a commutator will allow a loop of wire to continue spinning in a magnetic field, thereby allowing it to…

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Class 11 Physics (India): More on Newton's second law

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David explains how to use Newton's second law when dealing with multiple forces, forces in two dimensions, and diagonal forces. Class 11 Ph…

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Class 12 Physics (India): Bohr model radii

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Using equation for Bohr model radii to draw shell model for n=1 to 3, and calculating the velocity of a ground state electron. Class 12 Phy…

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Class 11 Physics (India): Normal force and contact force

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The force that keeps a block of ice from falling towards the center of the earth Class 11 Physics (India) Let's learn, practice, and master…

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Class 11 Physics (India) - Hindi: Visualizing vectors in 2 dimensions (Hindi)

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Visualizing, adding and breaking down vectors in 2 dimensions. Class 11 Physics (India) - Hindi To help students who prefer to learn by wat…

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Class 11 Physics (India): Carnot efficiency 3: Proving that it is the most efficient

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Proving that a Carnot Engine is the most efficient engine Class 11 Physics (India) Let's learn, practice, and master topics of class 11 phy…

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Physics: Derivation of the mirror equation

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In this video David derives the mirror equation and magnification equation. Physics Learn about the basic principles that govern the physic…

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Electrical engineering: Battery and motor mounts for Spider

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In this video we show you how to connect Spider's motors and batteries Electrical engineering Learn about electricity, circuit theory, and …

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Health and medicine: Stenosis, ischemia and heart failure

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Clarifying a bunch of medical terms around heart disease Health and medicine The medical world can be a confusing place. Patients, their fa…

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Health and medicine: Multiple sclerosis treatment

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Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…

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Electrical engineering: Motor controller connections

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In this video we show you how to attach and wire the L-298 motor controller board to Bit-zee's frame. Electrical engineering Learn about el…

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Health and medicine: Inflammation

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Dr. David Agus talks about inflammation (while Sal repeatedly misspells it with one "m") Health and medicine The medical world can be a con…

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Health and medicine: Peripheral somatosensation

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Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…