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New videos from Khan Academy 2019-07-03T19:26:12.489717
Actualizado: hace 2 horas 44 mins

Economic growth through investment

Mié, 2019-07-03 19:26
How investing for capital formation can expand the production possibilities curve

Labor-leisure tradeoff and the labor supply curve

Mié, 2019-07-03 18:46
The basis of the labor supply curve is the tradeoff of labor and leisure. When wages increase, the opportunity cost of leisure increases and people supply more labor. Interestingly, this is not always the case! At higher wages, the marginal benefit of higher wages becomes lower and when it drops below the marginal benefit of leisure, people switch to more leisure and less labor. This leads to the rather unusual looking backward bending labor supply curve.

Rock Art in the Green Sahara

Mié, 2019-07-03 03:23
The Sahara is the world's largest hot desert, spanning the entire northern part of Africa. Yet it hasn't always been dry -- archaeological and geological research shows that it has undergone major climatic changes over thousands of years. Rock art is one of the best records of the life of past peoples who lived across the Sahara. It often depicts extraordinary images of life, landscape and animals that show a time when the Sahara was much greener and wetter than it is now. To find out more, visit https://www.britishmuseum.org/africanrockart The African Rock Art Project is supported by Arcadia (https://www.arcadiafund.org.uk/) This film is in collaborative partnership with the Leverhulme Trust-funded project: “Peopling the Green Sahara. A multi-proxy approach to reconstructing the ecological and demographic history of the Saharan Holocene”, Paul Breeze, Nick Drake and Katie Manning, Department of Geography, King’s College London Modelling and mapping of the Green Sahara ©Kings College London Images ©Trust for African Rock Art (TARA)/David Coulson & ©Kings College London Animation and Motion Graphics by Soluis Heritage (http://www.soluis.com/)

The effect of interest rate changes in one country on currency values, the balance of payments, and exports.

Lun, 2019-07-01 15:43
Changes in interest rates in one country impact economic conditions in other countries. In this video, walk through a chain of events that starts with a change in interest rates in the United States that affects the relative value of the dollar, the Japanese Yen, and exports.

Factorization with substitution

Mar, 2019-06-18 01:39
Determining what to substitute for U and V in the pattern (U+V)²=U²+2UV+V² in order to factor (x+7)²+2y²(x+7)+y⁴.

Positive & negative work

Vie, 2019-06-07 11:30
Let's explore when work is positive & negative. 

Work done from kinetic energy - solved example

Vie, 2019-06-07 11:30
Let's calculate work done when velocities are given. 

Energy conservation - solved example

Vie, 2019-06-07 11:30
Let's solve 2 problems on energy conservation.

Intro to work

Vie, 2019-06-07 11:30
Let's explore how to calculate 'work' in physics.

Kinetic energy derivation

Vie, 2019-06-07 11:30
Let's derive the K.E. expression 1/2 m v^2.  

Gravitational potential energy derivation

Vie, 2019-06-07 11:30
Let's derive expression for gravitational potential energy. 

Work-energy theorem

Vie, 2019-06-07 11:30
Let's explore the work-energy theorem. 

Power

Vie, 2019-06-07 11:30
Let's explore the meaning of power (rate of doing work) in physics. 

Work done on lifting/falling things - Solved numerical

Vie, 2019-06-07 11:30
Let's calculate 2 problems on work done on lifting & falling bodies. 

Energy intro (kinetic & potential)

Vie, 2019-06-07 11:30
Let's explore what kinetic & potential energies are.

Law of energy conservation

Vie, 2019-06-07 11:30
Let's explore the law of conservation of energy.

Work done by gravity (path independent)

Vie, 2019-06-07 11:30
Let's see why work done by gravity is path independent. 

What was the Articles of Confederation?

Lun, 2019-06-03 17:59
John Dickerson discusses the history and the significance of the Articles of Confederation. John Dickerson is co-host of CBS This Morning. He was previously CBS News' Chief Washington Correspondent, Political Director and anchor of Face The Nation. Dickerson is also a contributor to Slate's Political Gabfest and to The Atlantic. During the 2016 presidential campaign, Dickerson moderated CBS News' two presidential debates. Prior to CBS, Dickerson was Slate Magazine's Chief Political correspondent and covered politics for twelve years for Time magazine. 

Why was George Washington the first president?

Lun, 2019-06-03 17:59
John Dickerson discusses George Washington's leadership qualities and his role as president. John Dickerson is co-host of CBS This Morning. He was previously CBS News' Chief Washington Correspondent, Political Director and anchor of Face The Nation. Dickerson is also a contributor to Slate's Political Gabfest and to The Atlantic. During the 2016 presidential campaign, Dickerson moderated CBS News' two presidential debates. Prior to CBS, Dickerson was Slate Magazine's Chief Political correspondent and covered politics for twelve years for Time magazine. 

What was the Gilded Age?

Lun, 2019-06-03 17:59
John Dickerson discusses the characteristics of the Gilded Age and how the era got its name. John Dickerson is co-host of CBS This Morning. He was previously CBS News' Chief Washington Correspondent, Political Director and anchor of Face The Nation. Dickerson is also a contributor to Slate's Political Gabfest and to The Atlantic. During the 2016 presidential campaign, Dickerson moderated CBS News' two presidential debates. Prior to CBS, Dickerson was Slate Magazine's Chief Political correspondent and covered politics for twelve years for Time magazine. 

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