Core beliefs around the role of government in the US. Discussion of quotes by Ronald Reagan, FDR, Barack Obama and Milton Friedman.
Unlike European option, an American options can be exercised at any point before it expires. In this video we walk through the process of exercising an American call option. Created by Sal Khan.
In 1944, the Americans (and Allies) make even more progress in the Pacific. By the end of the year, they have taken positions that put them within bombing range of Japan.
In 1944, the Americans (and Allies) make even more progress in the Pacific. By the end of the year, they have taken positions that put them within bombing range of Japan.
Unlike European option, an American options can be exercised at any point before it expires. In this video we walk through the process of exercising an American put option. Created by Sal Khan.
Introduction to amortization. Created by Sal Khan.
Comparing depreciation and amortization. Created by Sal Khan.
An example of simplifying a seemingly complicated resistor circuit. Created by Willy McAllister.
Neurons (or nerve cells) are specialized cells that transmit and receive electrical signals in the body. Neurons are composed of three main parts: dendrites, a cell body, and an axon. Signals are received through the dendrites, travel to the cell body, and continue down the axon until they reach the synapse (the communication point between two neurons).
Understanding the structure of a skeletal muscle cell.. Created by Raja Narayan.
Ancient Egypt was an early example of a massive civilization spanning thousands of years. Sal explains this history in an overview.
Sal provides an overview of the Greco-Persian Wars and the Peloponnesian War.
Why is Mesopotamia considered the "cradle of civilization"? Sal explains the history of the early empires on the Tigris and Euphrates rivers.
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.
This art history video discussion examines Andrea Mantegna's "Camera degli Sposi" (Frescos in the ducal palace, Mantua), 1465-74.
This art history video discussion examines Andrea Pisano, Reliefs for the Campanile in Florence, c. 1336.
Introducing angular momentum conceptually starting from linear momentum. Also covers some real-life examples. Created by Sal Khan.
David explains the meaning of angular displacement, angular velocity, and angular acceleration. Created by David SantoPietro.
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).