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New videos from Khan Academy 2019-04-16T23:33:56.273068
Actualizado: hace 1 hora 19 mins

Introduction to perfect competition

Mar, 2019-04-16 23:33
Perfect competition is a theoretical market structure in which there are many buyers and sellers, identical products (also called homogeneous products), perfect information, and no barriers to entry.

Free response question (FRQ) on perfect competition

Mar, 2019-04-16 23:33
Walk through the solution to a free response question (FRQ) like the ones you may see on an AP Microeconomics exam. Topics include why price equals marginal revenue (P=MR) for a perfectly competitive firm, how to draw side-by-side market and firm graphs, and how to find several points of interest in the firm graph.

Long-run economic profit for perfectly competitive firms

Mar, 2019-04-16 23:33
A firm in a perfectly competitive market might be able to earn economic profit in the short run, but not in the long run. Learn about the process that brings a firm to normal economic profits in this video.

Long-run supply curve in constant cost perfectly competitive markets

Mar, 2019-04-16 23:33
A constant cost industry is an industry where each firm's costs aren't impacted by the entry or exit of new firms. Learn about the difference between the short run market supply curve and the long run market supply curve for perfectly competitive firms in constant cost industries in this video.

Economic profit for firms in perfectly competitive markets

Mar, 2019-04-16 23:33
An important skill in microeconomics is the ability to find a firm's profit. Learn more about how to use a graph to identify the profit-maximizing quantity for a firm in a perfectly competitive market, and identify the area that represents the firm's profit or loss.

Long run supply when industry costs aren't constant

Mar, 2019-04-16 23:33
In some industries, the number of firms in the market has an impact on the costs that firms face. For example, when firms have to compete with each other over resources, firms' costs increase as more firms enter the market. But in other industries, more firms actually lower costs for firms. Learn about the implications of each of these situations on the long-run supply curve in an industry.

Finding force - Newton's second law (Solved example)

Mar, 2019-04-16 12:28
Let's solve some examples of Newton's second law of motion. Given various details of motion, we will see how to calculate the force on a body (using the second law of motion formula F = ma).

Calculating displacement from v-t graphs

Mar, 2019-04-16 12:28
Let's learn how to calculate displacements from v-t graphs. We will see why the area under the v-t graph gives displacement.

Average speed for entire journey - solved numerical

Mar, 2019-04-16 12:28
Let's learn how to calculate average speed when someone covers equal distances in two different speeds.

Momentum conservation - Solved example

Mar, 2019-04-16 12:28
Let's solve a couple of numerical on collision using momentum conservation.

Using equations of motion (2 steps numerical)

Mar, 2019-04-16 12:28
Let's solve some numerical on uniformly accelerated motion, which requires more than one step. Here we will use the equations of motion (kinematic equations) 2 times to find the required quantity.

After how long, Ram hears a splash?

Mar, 2019-04-16 12:28
Ram drops his phone from the bridge. Let's calculate how long it takes him to hear the sound of the splash. 

Intro to momentum (& it's meaning)

Mar, 2019-04-16 12:28
Let's learn the meaning of momentum and a little bit of why it is necessary.

Average speed & velocity (with examples)

Mar, 2019-04-16 12:28
Let's learn what average speed & velocity are using some examples.

Deriving 3 equations of motion (from v-t graph)

Mar, 2019-04-16 12:28
Let's derive the three equations of motion using a velocity time graph v = u + at s = ut + 1/2 at^2 v^2 = u^2+2as.

Echoes and reverberations

Mar, 2019-04-16 12:27
Let's learn what Echoes and reverberations are. We will also see how to reduce reverberations as they could be pretty annoying

Newton's first law intro (forces causes motion?)

Mar, 2019-04-16 12:27
Do forces really cause motion? Let's find out with examples.

Calc. speed & time in a uniform circular motion - Solved numerical

Mar, 2019-04-16 12:27
Let's solve 2 numerical on uniform circular motion.

Momentum conservation derivation

Mar, 2019-04-16 12:27
Let's derive the conservation of momentum mathematically (Mathematical Proof) from Newton's third law.

Echolocation & S.O.N.A.R

Mar, 2019-04-16 12:27
Let's learn how animals and ships use echoes to 'see' the world around them.