Determining how fast something will be traveling upon impact when it is released from a given height. Created by Sal Khan.
The ratio of a sinusoidal voltage to a sinusoidal current is called "impedance". This is a generalization of Ohm's Law for resistors. We derive the impedance of a resistor, inductor, and capacitor. The inductor and capacitor impedance includes a term for frequency, so the impedance of these components depends on frequency. Created by Willy McAllister.
Impedance of 2 elements in series is a complex number. Impedance terminology: reactance, susceptance, admittance. Created by Willy McAllister.
The impedance of capacitors and inductors in a circuit depend on the frequency of the electric signal. The impedance of an inductor is directly proportional to frequency, while the impedance of a capacitor is inversely proportional to frequency. Created by Willy McAllister.
Discussion of the properties of water that make it essential to life as we know it: polarity, "universal" solvent, high heat capacity, high heat of vaporization, cohesion, adhesion and lower density when frozen.
Figuring out the components of the force due to gravity that are parallel and perpendicular to the surface of an inclined plane. Created by Sal Khan.
Pamela shares tips on how to change variables (like incrementing or multiplying them) with less code.
Sal determines the current and EMF induced in a wire pulled through a magnetic field. Created by Sal Khan.
We look at the inductor i-v equations in derivative and integral form. Created by Willy McAllister.
We notice how important it is to give inductor current a place to flow. Created by Willy McAllister.
We give the inductor's kickback current a path to flow by adding a diode. Created by Willy McAllister.
Finally we arrive at our quantitative measure of entropy. Created by Brit Cruise.
Installing a power switch. Created by Karl Wendt.
Instantaneous speed and velocity looks at really small displacements over really small periods of time. Created by David SantoPietro.
Definite integral of the product of cosines. The integral of cos(mt) * cos(nt) = 0, except for the special case when m = n. When m = n, the integral evaluates to pi. Created by Sal Khan.
Definite integral of product of sines. The integral of sin(mt) * sin(nt) = 0, except for the special case when m = n. When m = n, the integral evaluates to pi. Created by Sal Khan.
Definite integral of the product of sine and cosine. Integrating sin(mt) * cos(nt) over a full period equals zero for any integer m and n. Created by Sal Khan.
Learn about the many types of interspecific interactions: competition, predation, herbivory, symbiosis, parasitism, mutualism, commensalism. Created by Sal Khan.
An introduction to Intergalactic Scale. Created by Sal Khan.
Whats on the inside vs. outside of a character?