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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Class 11 Physics (India): More on internal energy
Getting more intuition of internal energy, heat, and work. Examples of using the first law to calculate work. Class 11 Physics (India) Let'…
VideoFree14 minutes
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Physics: Optimal angle for a projectile part 3: Horizontal distance as a function of angle (and speed)
In this video, we'll finish writing the formula for distance as a function of the angle Physics Learn about the basic principles that gover…
VideoFree3 minutes
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Class 12 Physics (India): Transistor as a voltage amplifier
We will explore what it means to amplify a signal mathematically, and then see how our transistor does voltage amplification. We will also …
VideoFree12
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Class 11 Physics (India): Worked example: two inputs with the same output (graph)
Sal finds the input value other than -5 for which f(x)=f(-5), given the graph of f. Class 11 Physics (India) Let's learn, practice, and mas…
VideoFree2
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Class 11 Physics (India): Impact of mass on orbital speed
Example question exploring how mass impacts orbital speed. Class 11 Physics (India) Let's learn, practice, and master topics of class 11 ph…
VideoFree4
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Class 11 Physics (India) - Hindi: Sound Properties (Amplitude, Period, Frequency, Wavelength) (Hindi)
Let's take a closer look at the ways we can describe sound. Class 11 Physics (India) - Hindi To help students who prefer to learn by watchi…
VideoFree7
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Class 11 Physics (India): Intersection points of y=sin(x) and y=cos(x)
Sal draws the graphs of the sine and the cosine functions and analyzes their intersection points. Class 11 Physics (India) Let's learn, pra…
VideoFree11
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Class 11 Physics (India) - Hindi: Visualizing vectors in 2 dimensions (Hindi)
Visualizing, adding and breaking down vectors in 2 dimensions. Class 11 Physics (India) - Hindi To help students who prefer to learn by wat…
VideoFree14
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Class 10 Physics (India): Refraction in water
Refraction in Water Class 10 Physics (India) Let's explore the mysteries of light and electricity. From how light reflects to correcting de…
VideoFree4 minutes
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Class 11 Physics (India): Formal definition of the derivative as a limit
The derivative of function f at x=c is the limit of the slope of the secant line from x=c to x=c+h as h approaches 0. Symbolically, this is…
VideoFree16
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Class 12 Physics (India): Solved example: magnifying power of telescope
We will calculate the magnifying power of a telescope in normal adjustment, given the focal length of its objective and eyepiece. Class 12 …
VideoFree5
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Class 12 Physics (India): Photon Energy
In this video, David explains what a photon is and how to determine the energy of a photon. Class 12 Physics (India) It is now time to dive…
VideoFree9 minutes
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Physics: Discovery of magnetic fields
Magnetic materials seem to have two sides (we could call them poles). Depending on orientation they can be attractive or repulsive. What is…
VideoFree1 minute
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Class 11 Physics (India): Position vs. time graphs
How to read a position vs. time graph. Using the graph to determine displacement, distance, average velocity, average speed, instantaneous …
VideoFree15 minutes
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Chemistry: A look at a seductive but wrong Gibbs spontaneity proof
A look at why the "proof" of the relation between changes in Gibbs Free Energy and Spontaneity is wrong in many textbooks. Chemistry Did yo…
VideoFree7 minutes