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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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Class 11 Physics (India): Worked example: Derivative of ln(√x) using the chain rule

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f(x)=ln(√x) is a composition of the functions ln(x) and √x, and therefore we can differentiate it using the chain rule. Class 11 Physics (I…

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Class 11 Physics (India): Choosing kinematic equations

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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 11 Physics (India): Introduction to physics

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An overview of what physics is about as we delve deeper in future videos. How physics is related to math, the other sciences, and the world…

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Class 11 Physics (India): Absolute temperature and the kelvin scale

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Class 11 Physics (India) Let's learn, practice, and master topics of class 11 physics (NCERT) starting with kinematics and then moving to d…

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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…

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Electrical engineering: Integral of product of cosines

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Definite integral of the product of cosines. The integral of cos(mt) * cos(nt) = 0, except for the special case when m = n. When m = n, the…

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Class 12 Physics (India): Bohr model radii (derivation using physics)

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Using classical physics and vectors, plus assumption that angular momentum of electron is quantized, to derive the equation for Bohr model …

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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): Distance and displacement introduction

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An introduction to the difference between distance traveled and displacement. Class 11 Physics (India) Let's learn, practice, and master to…

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Class 11 Physics (India): Antiderivatives and indefinite integrals

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What's the opposite of a derivative? It's something called the "indefinite integral". Class 11 Physics (India) Let's learn, practice, and m…

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Class 12 Physics (India): How telescopes work

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Let's explore how telescopes work intuitively using a demo. Then we will talk about some nuances involved in drawing ray diagrams and deriv…

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Class 11 Physics (India): Two masses hanging from a pulley

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In this video David explains how to find the acceleration of two masses hanging from a pulley (using the easy method). Class 11 Physics (In…

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Class 11 Physics (India) - Hindi: Bernoulli's example problem 2 (Hindi)

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Ram solves a Bernoulli's equation example problem where a fluid is moving through a pipe of varying diameter. Class 11 Physics (India) - Hi…

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Class 11 Physics (India): Bulk stress and strain

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Let's explore the concept of bulk stress and bulk strain. Class 11 Physics (India) Let's learn, practice, and master topics of class 11 phy…

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Class 12 Physics (India): Voltage

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Sal explains the difference between electrical potential (voltage) and electrical potential energy Class 12 Physics (India) It is now time …