• #### Greenhouse Effect

##### Science›Physics›Heat Transfer and Change of Phase
How the greenhouse effect works.
• #### Thermal Energy Transfer

##### Science›Physics›Heat Transfer and Change of Phase
Understanding the processes behind thermal energy transfer.
• #### Derivatives of Logarithmic Functions - Problem 3

##### Math›Calculus›The Derivative
How to use the change of base formula to compute the derivative of log functions of any base.
• #### Properties of Logarithms - Problem 3

##### Math›Precalculus›Exponential and Logarithmic Functions
How to use the change of base theorem to rewrite or simplify logarithms.
• #### Properties of Logarithms - Problem 2

##### Math›Precalculus›Exponential and Logarithmic Functions
How to evaluate logarithms when a change of base is helpful.
• #### Average Velocity - Concept

##### Math›Calculus›The Derivative
How to compute the average velocity of an object moving in one dimension.
• #### The Definition of the Derivative - Concept

##### Math›Calculus›The Derivative
How to define the derivative of a function at a point x=a.
• #### Instantaneous Velocity - Concept

##### Math›Calculus›The Derivative
How to estimate the instantaneous velocity of an object at t=2 by computing average velocities over shorter and shorter intervals of time.
• #### Instantaneous Velocity - Problem 3

##### Math›Calculus›The Derivative
How to estimate instantaneous velocity when position and time are given in a table.
• #### Average Velocity - Problem 1

##### Math›Calculus›The Derivative
How to compute the average velocity of an object moving in one dimension and how to represent average velocity on a graph.
• #### Average Velocity - Problem 2

##### Math›Calculus›The Derivative
How to compute the average velocity of an object moving in one dimension from a graph of its position vs. time.
• #### Economics: Cost & Revenue - Problem 1

##### Math›Calculus›Applications of the Derivative
How to determine intervals of time when the average rate of change is negative or positive, and how to compute average rate of change from a graph.
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• #### Instantaneous Velocity

##### Science›Physics›Linear and Projectile Motion
How to find instantaneous velocity.
• #### Average Velocity - Problem 3

##### Math›Calculus›The Derivative
How to determine intervals of time when the average velocity is negative or positive, and how to determine whether average velocity over one interval of time is greater than average velocity over another.
• #### Instantaneous Velocity - Problem 1

##### Math›Calculus›The Derivative
How to estimate the instantaneous velocity of an object from a graph of position vs. time by computing slopes of secant lines over shorter and shorter intervals of time.
• #### Electrolysis

##### Science›Chemistry›Electrochemistry
Understanding how electrical energy produces chemical changes.
• #### Acceleration

##### Science›Physics›Linear and Projectile Motion
Understanding the acceleration of an object.
• #### Transmutation

##### Science›Chemistry›Nuclear Chemistry
How radioactive elements change their identities through transmutation.
• #### Impulse

##### Science›Physics›Energy and Momentum
Understanding the concept of impulse.
• #### Scientific Notation - Problem 1

##### Math›Algebra›Exponents
How to change a number in standard notation into scientific notation..