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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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Health and medicine: Preload stretches out the heart cells

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Find out why stretching a heart cell in diastole affects how forcefully it contracts in systole. Rishi is a pediatric infectious disease ph…

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Class 11 Physics (India) - Hindi: Ice accelerating down an incline (Hindi)

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Figuring out the acceleration of ice down a plane made of ice. Class 11 Physics (India) - Hindi To help students who prefer to learn by wat…

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Electrical engineering: Demo: coin detector

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demonstration of a simple coin detector Electrical engineering Learn about electricity, circuit theory, and introductory electronics. We al…

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Health and medicine: Primary hemostasis

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During primary hemostasis, a platelet plug is formed to rapidly stop the initial bleeding after injury. Learn about the different steps inv…

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Organic chemistry: Ring-opening reactions of epoxides: Strong nucleophiles

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How nucleophilic attack can open the highly strained ring of an epoxide. Organic chemistry Sal and Jay cover topics covered in college orga…

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Electrical engineering: Parallel resistors (part 2)

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Multiple resistors in parallel can be combined into a single equivalent resistor Electrical engineering Learn about electricity, circuit th…

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Physics: Parabolic mirrors 2

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Parabolic Mirrors 2 Physics Learn about the basic principles that govern the physical world around us. Solid understanding of algebra and a…

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Physics: Mirror equation example problems

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In this video David solves a few exmaple problems involving concave and convex mirrors using the mirror equation and magnification equation…

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Class 11 Physics (India): Matching functions & their derivatives graphically

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Given the graph of a function, we are asked to recognize the graph of its derivative. Class 11 Physics (India) Let's learn, practice, and m…

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Class 11 Physics (India): Shear stress and strain

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How do we really tear paper? This seems like a silly question, but the answer is 'we shear it'. So let's explore this concept of shearing. …

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Class 11 Physics (India) - Hindi: Choosing kinematic equations (Hindi)

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How to set up problems with constant acceleration and choose the best kinematic equation to solve for the target unknown. Class 11 Physics …

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Class 12 Physics (India): Extrinsic semiconductors P-type

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In this video, we will explore the P-type semiconductors. Class 12 Physics (India) It is now time to dive deeper into the world of physics …