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Cross product introduction | Vectors and spaces | Linear Algebra | Khan Academy

Teacherflix
12 Views · 1 year ago

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/ma....th/linear-algebra/ve

Introduction to the cross product

Watch the next lesson: https://www.khanacademy.org/math/linear-algebra/vectors_and_spaces/dot_cross_products/v/proof-relationship-between-cross-product-and-sin-of-angle?utm_source=YT&utm_medium=Desc&utm_campaign=LinearAlgebra

Missed the previous lesson?
https://www.khanacademy.org/math/linear-algebra/vectors_and_spaces/dot_cross_products/v/defining-a-plane-in-r3-with-a-point-and-normal-vector?utm_source=YT&utm_medium=Desc&utm_campaign=LinearAlgebra

Linear Algebra on Khan Academy: Have you ever wondered what the difference is between speed and velocity? Ever try to visualize in four dimensions or six or seven? Linear algebra describes things in two dimensions, but many of the concepts can be extended into three, four or more. Linear algebra implies two dimensional reasoning, however, the concepts covered in linear algebra provide the basis for multi-dimensional representations of mathematical reasoning. Matrices, vectors, vector spaces, transformations, eigenvectors/values all help us to visualize and understand multi dimensional concepts. This is an advanced course normally taken by science or engineering majors after taking at least two semesters of calculus (although calculus really isn't a prereq) so don't confuse this with regular high school algebra.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

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Ratio test | Series | AP Calculus BC | Khan Academy

Teacherflix
12 Views · 1 year ago

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/ma....th/ap-calculus-bc/bc

The ratio test is a most useful test for series convergence. It caries over intuition from geometric series to more general series. Learn more about it here.

AP Calculus BC on Khan Academy: Learn AP Calculus BC - everything from AP Calculus AB plus a few extra goodies, such as Taylor series, to prepare you for the AP Test

About Khan Academy: Khan Academy is a nonprofit with a mission to provide a free, world-class education for anyone, anywhere. We believe learners of all ages should have unlimited access to free educational content they can master at their own pace. We use intelligent software, deep data analytics and intuitive user interfaces to help students and teachers around the world. Our resources cover preschool through early college education, including math, biology, chemistry, physics, economics, finance, history, grammar and more. We offer free personalized SAT test prep in partnership with the test developer, the College Board. Khan Academy has been translated into dozens of languages, and 100 million people use our platform worldwide every year. For more information, visit www.khanacademy.org, join us on Facebook or follow us on Twitter at @khanacademy. And remember, you can learn anything.

For free. For everyone. Forever. #YouCanLearnAnything

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The Word

Teacherflix
12 Views · 1 year ago

The word "are" is spelled a-r-e. The word "are" is a form of the word "be," which can describe the quality of a person, place, or thing. These apples are tasty!

Learn the sight word "are" with the Khan Academy Kids characters. The fun example, easy-to-remember definition, and cute illustrations will help kids remember the word any time they come across it.

Visit us at http://www.khankids.org to learn more about Khan Academy Kids, a free educational app for preschool through 2nd grade.

Available on Google Play, Apple, and Amazon app stores:
➡️ http://khan.co/KhanKids-YT-Google
➡️ http://khan.co/KhanKids-YT-Apple
➡️ http://khan.co/KhanKids-YT-Amazon

You can also access other sight words videos on our Sight Words playlist here: http://khan.co/KhanKids-SightWords.

Subscribe to our channel for more videos like this.

Counting On | How to Subtract | Khan Academy Kids

Teacherflix
12 Views · 1 year ago

Learn more counting, addition, and subtraction lessons in the FREE Khan Academy Kids app! https://go.learn.khanacademy.o....rg/khanacademy/YouTu

Peck learns subtraction by counting backward with strawberries. Way to count on, Peck!

Visit us at http://www.khankids.org to learn more about Khan Academy Kids, a free educational app for preschool through 2nd grade available on Apple, Google Play, and Amazon app stores.

You can also access other videos on our Addition and Subtraction playlist here: http://khan.co/KhanKids-AdditionSubtraction

Subscribe to our channel for more videos like this.

Questions? Reach our team at khankids@khanacademy.org.

Deadly units you don't want to come across in war

Teacherflix
12 Views · 1 year ago

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Created by Daniel Turner (B.A. (Hons) in History, University College London)

The Weaponry of the Blood Thirst Viking Raiders!

Teacherflix
12 Views · 1 year ago

Though we often think of the Vikings of Scandinavia as being barbarians, when it came to warfare they were quite advanced warriors, as well as being highly practical. So they tended to favour weapons that served a purpose in everyday life, as well as on the battlefield.

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Credit:
Created by Daniel Turner (B.A. (Hons) in History, University College London)
Script: Conan White
Narrator:

Bryan 'Lazlo' Beauregard

Music Credit
Crusade - Video Classica by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 license. https://creativecommons.org/licenses/by/4.0/

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Artist: http://incompetech.com/

Sources:

Weapons of the Viking Warrior
By Gareth Williams

The Viking Age: The Early History, Manners, and Customs of the ..., Volume 2
By Paul Belloni Du Chaillu

Ancient Weapons in Britain
By Logan Thompson

What's on the Menu in modern day army MREs?

Teacherflix
12 Views · 1 year ago

Bro does Beer Run for his Buddies in Vietnam War

Teacherflix
12 Views · 1 year ago

Join the Simple History community on Patreon today! 📚👉 https://www.patreon.com/simplehistory
Unlock exclusive behind-the-scenes content, early access to videos, and join us in preserving and sharing the incredible stories of our past. Your support helps us bring history to life! Join now and be a part of the Simple History journey. 🕰🌟

Truth is often stranger than fiction, and sometimes a real life tale is so outlandish, that people are often left to wonder “why hasn’t this been made into a movie.” This is one of those stories.

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Credit:
Show Created by Daniel Turner (B.A. (Hons) in History, University College London)
Script: Robert de Graff
Narrator: Jared Sager

Who is Putin?

Teacherflix
12 Views · 1 year ago

Where did Vladimir Putin come from? What was Putin’s education? Who pushed Putin to pursue a meteoric rise to Prime Minister and President of the largest country in the word? Watch Putin’s history unfold from his modest origins to the dominant figure he is today.

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Credit:
Created by Daniel Turner (B.A. (Hons) in History, University College London)

Narrator:
Bryan 'Lazlo' Beauregard

Sources:

· Sebestyen, Victor (2018), Lenin the Dictator
· Truscott, Peter (2005). Putin's Progress: A Biography of Russia's Enigmatic President, Vladimir Putin
· Lynch, Allen. Vladimir Putin and Russian Statecraft
· Vladimir Putin; Nataliya Gevorkyan; Natalya Timakova; Andrei Kolesnikov (2000). First Person: An Astonishingly Frank Self-Portrait by Russia's President Vladimir Putin
· Rosefielde, Steven; Hedlund, Stefan (2009). Russia Since 1980
· Dawisha, Karen (2015). Putin's Kleptocracy: Who Owns Russia?

Battle of Mirbat (9 SAS Soldiers VS 300 Adoo Guerrillas)

Teacherflix
12 Views · 1 year ago

Play World of Warships here: https://wo.ws/3aaFBpX
Thank you World of Warships for sponsoring this video.
During registration use the code FIRE to get for free: 200 doubloons, 1 million credits, the Premium Battleship Tier 5 - USS Texas, 20x Restless Fire Camouflage, and 7 Days Premium Account.

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Credit:
Created by Daniel Turner (B.A. (Hons) in History, University College London)
Script: Dejan Milivojevic
Narrator:

Chris Kane
https://vocalforge.com/

Sources:
Cole, Roger, and Richard Belfield. SAS Operation Storm. Hodder & Stoughton, 2011.
White, Rowland. Storm Front. Corgi, 2012.
“Battle of Mirbat: The near Alamo of the Special Air Service.” SOFREP, 5 Mar. 2020, sofrep.com/news/special-air-services-secret-war-oman-part-5/
Malcher, Author Alan. “The Battle of Mirbat, Oman, 19 July 1972: 22nd Special Air Service Regiment.” Alan Malcher, 15 Dec. 2021,

Life Inside a WWI A7V Tank (Cross Section)

Teacherflix
12 Views · 1 year ago

Thanks to World of Tanks for sponsoring this video! Click here to claim your free premium World of Tanks starter Pack: https://tanks.ly/3mIQgyd

One of the most iconic visual elements of the Second World War are German panzers blitzing their way across enemy territory, leaving a trail of death and destruction in their wake.
During the First World War, German tanks had a less than auspicious start. Their first attempt at a tank design was the A7V, a clunky metal box on tracks, a far cry from the formidable vehicles of a quarter century later.

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The Great Leap Forward (1958-62)

Teacherflix
12 Views · 1 year ago

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Land reform, where estates had been taken from rich landowners and redistributed to the peasants had taken place shortly after the communists had come to power.
Collectivisation, where peasants lost their own pieces of land and instead worked for wages on land owned by the state had also begun to take place.

Mao believed this was not enough to expand both agricultural and industrial production and instead introduced the second five-year plan in 1958.
This would become known as the ‘Great Leap Forward’.

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Credit:
Created by Daniel Turner

Narrator:

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https://vocalforge.com/

Music Credit:
Decline by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/r....oyalty-free/index.ht
Artist: http://incompetech.com/

Sources:
Tombstone. The Untold story of Mao’s Great Famine.
By Yang Jisheng.

Red Inc.: Dictatorship and the Development of Capitalism in China, 1949-2009
By Robert K. Schaeffer

Socialism in China (1919-1965)
By Yu Youjun

Mao's Great Famine: The History of China's Most Devastating Catastrophe, 1958-62
By Frank Dikötter

The Great Famine in China, 1958-1962: A Documentary History

How Long Would You Survive In The Past?

Teacherflix
12 Views · 1 year ago

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Thanks to the technological advances of the modern age, in 2023 life is pretty safe. In the past however, many of the things we take for granted now were likely a death sentence for our ancestors.

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Show Created by Daniel Turner (B.A. (Hons) in History, University College London)
Script: Jake Leigh-Howarth

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https://vocalforge.com/

Backe, Caleb. "Deadly Beauty Practices In History." 6 March, 2022. Maple Holistics.

BAUS. "Virtual Museum Time Corridor 17th Century". Accessed 27 February, 2023.

CDC. "Syphilis: The Facts." Accessed 27 February, 2023.

CTPA. "Cosmetic Safety." Accessed 27 February, 2023.

De Abreu, Kristine. "Apocalypse Then: The Volcanic Winter of 536AD." July 18, 2022. ExplorersWeb.

Degroot, Dagomar. "Small climate changes can have devastating local consequences – it happened in the Little Ice Age." July 27, 2021. The Conversation.

Eschner, Kat. "Fearing a Smallpox Epidemic, Civil War Troops Tried to Self-Vaccinate." May 1, 2017. Smithsonian.

Finance. "Scotland to Panama Flight Duration." Accessed 27 February, 2023.

Greschko, Michael. "Colossal volcano behind 'mystery' global cooling finally found." August 23, 2019. NationalGeographic.

Grist, Kerry. "Dangerous Beauty: Hazardous Chemicals and Poisons in Historic Cosmetics." 29 July 2022. ScienceMuseumGroup.

Johnson, Ben. "The Darien Scheme." Accessed 27 February, 2023.

Kelly, DB. "The Deadly Great Frost of 1709 Is Still a Mystery." Last modified 13 January, 2022. Grunge.

Lanchester, John. "How the Little Ice Age Changed History." March 25, 2019. The New Yorker.

Laumonier, Lucie. "A Medieval Peasants’ Winter." rused 27 February, 2023.

Maley, Sonny. "The Darien Scheme." May 2005. GLA.

Maloney, T.R., Dilkes-Hall, I.E., Vlok, M. et al. "Surgical amputation of a limb 31,000 years ago in Borneo." Nature 609 (September 2022): 547–551.

Oosthoek, K. Jan. "Little Ice Age." June 5, 2015. EH Resources.

Pattenden, Miles. "Volcanoes, plague, famine and endless winter: Welcome to 536, what historians and scientists believe was the ‘worst year to be alive'." February 1, 2022. The Conversation.

Seladi-Schulman, Jill. "What Is the Periosteum?" Last modified September 26, 2018. Healthline.

Shuster, Sam. "Painless amputation: history of a discovery
that wasn’t made." BMJ (19-26 December 2009).

Smith College. "The Effects of the Little Ice Age (c. 1300-1850)." Accessed 27 February, 2023.

Wischhover, Cheryl. "The Most Dangerous Beauty Through the Ages." December 17, 2013. TheCut.

Zapata, Mariana. "How Civil War Soldiers Gave Themselves Syphilis While Trying to Avoid Smallpox." November 30, 2016. Atlas Obscura.

Hungarian Uprising, Budapest (1956)

Teacherflix
12 Views · 1 year ago

A rise of protests by students and workers waving Hungarian flags with the communist emblem in the centre cut out arose in Budapest, erupting into active fighting in October 1956.

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Credit:

Narrator:

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http://ckvox.com/

Animation:
Daniel Turner

Artwork:
Daniel turner

Logo of the Warsaw Treaty Organization of Friendship, Cooperation, and Mutual Assistance

CC BY-SA 3.0

Fenn-O-maniC - Own work

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Music Credit

The Descent Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/by/3.0/