High level overview from Ancient Egypt to Babylon with reference to stories from the Old Testament.
This overview of Ancient Persia explains the origins of the term "Persia" and Zoroastrianism; it also puts the Median, Achaemenid, Seleucid, Parthian, Sassanian dynasties in context.
Introducing angular momentum conceptually starting from linear momentum. Also covers some real-life examples. Created by Sal Khan.
In uniform circular motion, angular velocity (𝒘) is a vector quantity and is equal to the angular displacement (Δ𝚹, a vector quantity) divided by the change in time (Δ𝐭). Speed is equal to the arc length traveled (S) divided by the change in time (Δ𝐭), which is also equal to |𝒘|R. And arc length (S) is equal to the absolute value of the angular displacement (|Δ𝚹|) times the radius (R).
Now we'll pull everything together and explore how we calculate the position of a particle over time (frame by frame).
Annual Interest Varying with Debt Maturity. Created by Sal Khan.
The annual percentage rate (APR) that you are charged on a loan may not be the amount of interest you actually pay. The amount of interest you effectively pay is greater the more frequently the interest is compounded. In this video, we calculate the effective APR based on compounding the APR daily. Created by Sal Khan.
More on quantitative easing. Created by Sal Khan.
Interpreting an excerpt of Brutus No. 1, the most well-known of what will be eventually called the "Anti-Federalist Papers," which argued against the ratification of the Constitution of 1787.
DNA is composed of two strands of nucleotides held together by hydrogen bonding. The strands each run from 5' to 3' and run in antiparallel, or opposite, directions from one another.
Ape clarification - that they have no tails.
The diagram of NMR created, which explains the different application of NMR.
Sal applies Newton's first law the answer some true/false statements about why objects move (or not). Created by Sal Khan.
Using the Hardy-Weinberg equation to calculate allele and genotype frequencies. Created by Sal Khan.
From Lee's Surrender to Grant to Lincoln's Assassination. Created by Sal Khan.
Apsidal Precession (Perihelion Precession). Created by Sal Khan.
Arabia after World War I
Arbitrage is taking advantage in price differences to earn a profit. In this video we explore arbitrage opportunities in options markets. Created by Sal Khan.
Explanation of arbitraging a futures contract. Created by Sal Khan.
Arbitraging Futures Contracts II. Created by Sal Khan.