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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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Physics: Proof: S (or entropy) is a valid state variable

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Proof that S (or entropy) is a valid state variable. Physics Learn about the basic principles that govern the physical world around us. Sol…

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Class 11 Physics (India): Center of mass

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Sal gives a conceptual understanding of what center of mass means. Class 11 Physics (India) Let's learn, practice, and master topics of cla…

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Physics: AP Physics 1 review of Forces and Newton's Laws

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In this video David quickly explains each concept behind Forces and Newton's Laws and does a sample problem for each concept. Keep an eye o…

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Class 11 Physics (India) - Hindi: Impulse and momentum pillow-fight example (Hindi)

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In this video, Ram shows how to solve for the impulse and force applied during a dodgeball collision using the impulse-momentum relationshi…

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Class 11 Physics (India) - Hindi: Would a brick or feather fall faster? (Hindi)

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What would fall faster on the moon, a brick or a feather? Class 11 Physics (India) - Hindi To help students who prefer to learn by watching…

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Class 11 Physics (India): Macrostates and microstates

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In physics, a microstate is defined as the arrangement of each molecule in the system at a single instant. A macrostate is defined by the m…

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Class 12 Physics (India): Band theory of solids

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To understand electrical properties of solids, we need to use Band theory. In this video, we will explore this new theory called Band theor…

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Physics: Algebraically manipulating Lorentz transformation

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The forms in which we've introduced the Lorentz transformations are really nice in that they reveal the symmetry of the two axes of spaceti…

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Electrical engineering: Application of the fundamental laws (setup)

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We can solve circuits by the direct application of the fundamental laws: Ohm's Law and Kirchhoff's Laws. (Part 1 of 2) Electrical engineeri…

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Class 10 Physics (India): Presbyopia

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Let's explore what are the symptoms and causes of Presbyopia. We will also see how bifocals correct them. Created by Mahesh Shenoy Class 10…

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Class 11 Physics (India) - Hindi: Equation for simple harmonic oscillators (Hindi)

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In this video Ram explains the equation that represents the motion of a simple harmonic oscillator and solves an example problem. Class 11 …

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Electrical engineering: Inductor kickback (2 of 2)

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We give the inductor's kickback current a path to flow by adding a diode Electrical engineering Learn about electricity, circuit theory, an…

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Class 10 Physics (India): Solved example on lens formula

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Using lens formula can be tricky because we need to substitute using signs. In this video, we will take one example and discuss how to use …

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Class 11 Physics (India) - Hindi: Linear velocity comparison from radius and angular velocity: Worked example (Hindi)

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Linear velocity from the radius and angular velocity for two pumpkin catapults with different arm lengths. Class 11 Physics (India) - Hindi…

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Class 11 Physics (India): Equation for simple harmonic oscillators

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David explains the equation that represents the motion of a simple harmonic oscillator and solves an example problem. Class 11 Physics (Ind…