Introduction to ecosystems. How land ecosystems are classified into biomes.
Education as a force of convergence. A discussion with Sal Khan.
Why we calculate percent changes in a strange way when calculating elasticities. Created by Sal Khan.
Thinking about elasticity of supply. Created by Sal Khan.
How we elect our President in the United States. Created by Sal Khan.
Sal shows that there will be a net torque on a loop of current in a wire. Sal shows that this net torque will cause the loop to rotate. Created by Sal Khan.
Sal shows that a commutator can be used in order to keep the loop of wire rotating in the magnetic field. Created by Sal Khan.
Sal finishes the explanation of how a commutator will allow a loop of wire to continue spinning in a magnetic field, thereby allowing it to work as an electric motor. Created by Sal Khan.
Introduction to electric potential energy. Created by Sal Khan.
How a cell can use a molecule's electrochemical gradient to power secondary active transport.
Common elemental building blocks of biological molecules: Carbon, Oxygen, Hydrogen, Nitrogen and Phosphorus.
How elements relate to atoms. The basics of how protons, electrons, and neutrons make up an atom. Created by Sal Khan.
An emf induced by motion relative to a magnetic field is called a motional emf. This is represented by the equation emf = LvB, where L is length of the object moving at speed v relative to the strength of the magnetic field B.
Starting with the reign of Augustus and ending with the reign of Marcus Aurelius, the Pax Romana is a relatively stable 200 year period. The first five emperors are of the Julio-Claudia Dynasty. The last five of the Pax Romana are considered the "good" emperors by Machiavelli.
Austria-Hungary. Ottoman empire. British, German, French and Russian empires.
Bulk transport: endocytosis, phagocytosis, and pinocytosis.
An overview of the membrane-bound structures that form the endomembrane system in eukaryotic cells.
Structure of the endoplasmic reticulum and Golgi body (Golgi apparatus). Their role in protein secretion. Created by Sal Khan.
The theory of how mitochondria, chloroplasts and other membrane-bound organelles in eukaryotic cell likely arose from a symbiosis between aerobic prokaryotes and host anaerobic eukaryotic ancestors. Developed by Lynn Margulis.
Sal graphs elastic potential energy and kinetic energy for a mass on a spring and compares the total energy when with and without dissipative forces (friction).