Clarifying the effect of axial precession on the calendar and the date of perihelion and aphelion. Created by Sal Khan.
What effect do interactions between species have on the sizes of the populations involved? Learn about the dynamics of predator and prey populations, and how they can influence one another’s patterns of growth and decline.
Sal explains the difference between liquids and gasses (both fluids). He then starts a calculation of the work done on a liquid in a U-shaped container. Created by Sal Khan.
Sal finishes the calculation of work to determine the mechanical advantage in a U-shaped tube. He also explains pressure and Pascal's Principle. Created by Sal Khan.
Sal derives the formula to determine the pressure at a specific depth in a fluid. Created by Sal Khan.
An overview of Preventing default behavior of events
How can a machine tell us if a number is prime? Created by Brit Cruise.
An attempt at an optimal trial division primality test using the Sieve of Eratosthenes. Created by Brit Cruise.
Learn how to use jQuery to process a simple quiz, checking if the user entered the correct answer and messaging the result.
An overview of Processing forms with events
Sound is vibrating air. But how does the air start vibrating? Created by David SantoPietro.
Now it's your turn to show your stuff! Press play for instructions. To start your project you need to make a modification to this code and then click spin-off. "By participating in this activity, you acknowledge that similar characters may be independently created and you agree to waive any claims against Pixar or Khan Academy for any similarities between the images you produce and independently created characters."
Figuring out the horizontal displacement for a projectile launched at an angle. Created by Sal Khan.
Visualizing position, velocity and acceleration in two-dimensions for projectile motion.
Prokaryotic and eukaryotic cells. Bacteria and archaea.
Advanced proof of the formula for the electric field generated by a uniformly charged, infinite plate. Created by Sal Khan.
We see that the infinite, uniformly charged plate generates a constant electric field (independent of the height above the plate). Created by Sal Khan.
Amplitude, period, frequency and wavelength of periodic waves. How to calculate wave velocity. Created by Sal Khan.
In this video we attach Bit-zee's bread board. Created by Karl Wendt.
Random vs. Pseudorandom Number Generators. Created by Brit Cruise.