The mechanics of the carry trade. Created by Sal Khan.
Simple example of cash accounting. Created by Sal Khan.
How categorical grants, mandates, and the Commerce Clause have been used to expand federal power over state affairs.
Causes and effects of human migration in Africa and the Pacific.
Exchange rates are determined in the foreign exchange market, but what causes those exchange rates to change? In this video, learn about why the supply or demand for a currency might change.
Learn about how phospholipids form the cell membrane, and what types of molecules can passively diffuse thorugh the membrane. By William Tsai. . Created by William Tsai.
Learn about the major components that make up our cell membrane and the fluid mosaic model. By William Tsai.
Learn about the different types of proteins that exist on the cell membrane. By William Tsai.
Yeast can reproduce sexually through a signaling pathway known as the mating factor pathway. In this process, two haploid yeast cells combine to form a diploid cell. Yeast cells secrete a signal molecule called mating factor that attracts them to their mates. Once the mating factor of one yeast binds to the receptor on another yeast, an outgrowth called a "shmoo" forms, which allows the yeast cells to fuse together.
Thinking about the limiting factors of cell size. Focus on volume to surface area ratio.
Introduction to cell theory. Roles of Hooke, Leeuwenhoek and others in its development.
What cellular evidence do we have to construct evolutionary trees and believe that all life on Earth shares a common ancestry?
Introduction to cellular respiration, including glycolysis, the Krebs Cycle, and the electron transport chain. Created by Sal Khan.
Introduction to cellular respiration, including glycolysis, the Krebs Cycle, and the electron transport chain. Created by Sal Khan.
Sal gives a conceptual understanding of what center of mass means. Created by Sal Khan.
Cepheid Variables 1. Created by Sal Khan.
A worked example finding the change in centripetal acceleration from the change in linear speed, and an example finding the change in centripetal acceleration from the change in radius.
In this video we illustrate and explain the differences between a change in the quantity demanded for a good (which causes a movement along a demand curve) and the change in a good's demand (which causes the entire demand curve to shift).
A demand shifter is a change that shifts the demand curve for a product. One of the demand shifters is buyers' expectations. If a buyer expects the price of a good to go down in the future, they hold off buying it today, so the demand for that good today decreases. On the other hand, if a buyer expects the price to go up in the future, the demand for the good today increases. Explore the role of buyers' expectations as a determinant of demand in this video. Created by Sal Khan.
A worked example finding the change in the period from the change in angular velocity, and an example finding the change in frequency from the change in angular velocity.