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### Electricity and magnetism : Magnetism 11: Electric Motors

##### By: Sal Khan

Using a commutator to solve the flipping problem and create an electric motor.

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Electricity and magnetism : Cross product 1

##### By: Sal Khan

Introduction to the cross product

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Thermodynamics : Carnot Cycle and Carnot Engine

##### By: Sal Khan

Introduction to the Carnot Cycle and Carnot Heat Engine

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Thermodynamics : PV-diagrams and Expansion Work

##### By: Sal Khan

Why work from expansion is the area under the curve of a PV-diagram

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Thermodynamics : Thermodynamic Entropy Definition Clarification

##### By: Sal Khan

Clarifying that the thermodynamic definition of Entropy requires a reversible system.

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Thermodynamics : Thermodynamics (part 5)

##### By: Sal Khan

Example problem involving PV=nRT

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Fluids : Fluids (part 4)

##### By: Sal Khan

Using our understanding of fluid pressure to figure out the height of a column of mercury.

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Electricity and magnetism : Circuits (part 4)

##### By: Sal Khan

A hairy resistance problem

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Waves and optics : Refraction and Snell's Law

##### By: Sal Khan

Refraction and Snell's Law

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Fluids : Fluids (part 9)

##### By: Sal Khan

Second part of the Bernoulli's Equation proof. Beginning of a problem that uses the equation.

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Waves and optics : Doppler effect formula for observed frequency

##### By: Sal Khan

Doppler effect formula for observed frequency

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Thermodynamics : Reconciling Thermodynamic and State Definitions o...

##### By: Sal Khan

Long video explaining why entropy is a measure of the number of states a system can take on (mathy, but mind-blowing).

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Thermodynamics : Stoichiometry Example Problem 1

##### By: Sal Khan

Figuring grams of reactants and product produced from reaction of phosphorous and chlorine

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Electricity and magnetism : Magnetism 7

##### By: Sal Khan

The magnetic force that two current-carrying wires exert on each other.

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Thermodynamics : Thermodynamics (part 3)

##### By: Sal Khan

Introduction to Kelvin. Example of a problem involving the ideal gas law

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Torque, moments and angular momentum : Moments

##### By: Sal Khan

Introduction to moments

Thinking about making things rotate. Center of mass, torque, moments and angular velocity.

### Thermodynamics : Proof: U=(3/2)PV or U=(3/2)nRT

##### By: Sal Khan

Conceptual proof that the internal energy of an ideal gas system is 3/2 PV.

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Fluids : Fluids (part 7)

##### By: Sal Khan

Introduction to the study of moving fluids.

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Fluids : Fluids (part 2)

##### By: Sal Khan

Pressure and Pascal's Principal.

Projectile motion, mechanics and electricity and magnetism. Solid understanding of algebra and a basic understanding of trigonometry necessary.

### Torque, moments and angular momentum : Introduction to Torque

##### By: Sal Khan

An introduction to torque

Thinking about making things rotate. Center of mass, torque, moments and angular velocity.

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