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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Biology: Understanding and building phylogenetic trees
Learn how to read and draw phylogenetic trees, or cladograms. Biology Life is beautiful! From atoms to cells, from genes to proteins, from …
VideoFree11 minutes
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Biology: Carbon as a building block of life
Carbon as a building block of life. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems,…
VideoFree9 minutes
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High school biology: Example identifying roles in a food web
Example identifying roles in a food web High school biology Trophic levels Topic: Science Learn about all the sciences, from physics, chemi…
VideoFree2 minutes
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Physics: Calculating neutral velocity
Let's now do the math to calculate the equal speed at which both A and B could be traveling away from a "neutral" observer. Physics Learn a…
VideoFree7 minutes
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Chemistry: Titration of a weak acid with a strong base
Calculating the pH for titration of acetic acid with strong base NaOH before adding any base and at half-equivalence point. Chemistry Did y…
VideoFree14 minutes
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Physics: Lorentz transformation derivation part 3
Finishing our Lorentz transformation derivation for t'. Physics Learn about the basic principles that govern the physical world around us. …
VideoFree11 minutes
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Physics: How much electrolyte does a single cell need?
Observation: when we pull our cell out of the electrolyte it still causes a deflection, which increases when pressure is applied. How could…
VideoFree1 minute
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Class 11 Physics (India): Graphically adding & subtracting vectors
Build intuition behind adding and subtracting vectors visually and the "head-to-tail" method. Class 11 Physics (India) Let's learn, practic…
VideoFree6
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Class 12 Physics (India): Simplifying resistor networks
A systematic approach to simplify a complicated resistor network by looking for series and parallel resistor patterns. Class 12 Physics (In…
VideoFree8 minutes
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Class 11 Physics (India): Charles's law
Class 11 Physics (India) Let's learn, practice, and master topics of class 11 physics (NCERT) starting with kinematics and then moving to d…
VideoFree8
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Class 11 Physics (India): Constructive and Destructive interference
In this video David explains what constructive and destructive interference means as well as how path length differences and pi shifts affe…
VideoFree14 minutes
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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): Elastic and inelastic collisions
David explains what it means for a collision to be elastic or inelastic. Class 11 Physics (India) Let's learn, practice, and master topics …
VideoFree14 minutes
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Class 11 Physics (India): Adding & subtracting vectors
Sal shows how to add vectors by adding their components, then explains the intuition behind adding vectors using a graph. Class 11 Physics …
VideoFree8
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Class 11 Physics (India): How to strengthen concrete?
Concrete is strong, but not strong enough to make roads out of them. In this video, we will explore how we can use the concepts of elastici…
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