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Why is it hard to move a heavy bookcase across a carpeted floor? And why is it easier to keep it moving than it was to get it started moving? You might think it's all about weight, but actually it's about friction. Two kinds of friction! In today's episode of Crash Course Physics, Shini Somara tells us about Static and Kinetic friction; how they work and how they're different.


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What is social deviance? Who defines what is deviant and how to people come to behave that way? Today we’re going to explore biological and psychological approaches to explaining deviance, including what each perspective can bring to the table, and their inherent limitations. From there, we’ll explain the sociological perspective and the social foundations of deviance.

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Sunflower student movement in Taiwan by Artemas Liu https://www.flickr.com/photos/....48144725@N02/1376431 (CC BY 2.0)

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Today we explore what obligations we hold with our personal beliefs. Hank explains epistemic responsibility and the issues it raises with everything from religious belief, to ship owning, to vaccinations.

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In which John Green teaches you WHY World War I started. Or tries to anyway. With this kind of thing, it's kind of hard to assign blame to any one of the nations involved. Did the fault lie with Austria-Hungary? Germany? Russia? Julius Caesar? One thing we can say for sure is that you can't blame the United States of America for this one. Woohoo! Well, you can hardly blame the US.

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Escape was one of the many ways that enslaved people resisted their captivity in the system of American slavery. The Underground Railroad was not literally a railroad. It was a network of people, routes, and safe houses that helped people escape from slavery in the south to freedom in the north. Today we'll talk about the origins of the Underground Railroad, the systems that helped people escape, and the people who helped along the route.

Clint's book, How the Word is Passed is available now! https://bookshop.org/a/3859/9780316492935

SOURCES
https://www.newyorker.com/maga....zine/2016/08/22/the-
http://www.pbs.org/black-cultu....re/shows/list/underg
https://www.nationalgeographic.....org/encyclopedia/un
https://www.theatlantic.com/ma....gazine/archive/2015/
https://www.nps.gov/subjects/u....ndergroundrailroad/w

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#crashcourse #history #undergroundrailroad

The end of the Napoleonic Wars left the great powers of Europe shaken. Judging from the destruction that had been wrought across the continent, it seemed to the powers that be that the Enlightenment had liberated the people, and led to disaster. So, everybody got together in Vienna to have a Congress, and to try to put Europe "right" again. By "right" I mean they wanted to go back to the old days of kings, queens, and nobles running the show. But this new yearning for the past pervaded the continent. Roomanticism arose at the same time, looking back at (imagined) golden age of Medieval Times. Today we'll talk about the Congress of Vienna, The Holy Alliance, and the Romantic movement across the arts.

Sources

-Blanning, Tim. The Romantic Revolution: A History. London: Weidenfeld and Nicolson, 2011.
-Hunt, Lynn. Making of the West: Peoples and Cultures. Boston: Bedford St Martin’s, 2019.
-Vick, Brian E. Congress of Vienna: Power and Politics after Napoleon. Cambridge: Harvard University Press, 2014.

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#Crashcourse #history #europeanhistory

How to solve Simultaneous Equations by Elimination.

For more examples of how to solve simultaneous equations using the elimination method go here: https://www.youtube.com/playli....st?list=PLjbxBzUM6SL

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TeacherTube User: Sposilovich

TeacherTube URL: http://www.teachertube.com/vie....wVideo.php?video_id=

This is a math video lesson to help you with new math, math tricks, and or simple math questions you may have.

Spring 2012
Systems of Linear Equations

TeacherTube User: Bullcleo1

TeacherTube URL: http://www.teachertube.com/vie....wVideo.php?video_id=

This is a math video lesson to help you with new math, math tricks, and or simple math questions you may have.

http//mathispower4u.yolasite.com/

GeoGebra is an interactive geometry, algebra, statistics and calculus application, intended for learning and teaching mathematics and science from primary school to university level. GeoGebra is available on multiple platforms, with apps for desktops, tablets and web.

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Learn how to make a simple but tasty recipe – avocado toast!
We hope you are enjoying our large selection of engaging core & elective K-12 learning videos. New videos are added all the time - make sure you come back often to learn more! If you’d like us to cover any additional topics, please let us know.
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How to simplify square roots. I give step by step instructions on how to simplify a square root. Once you see a couple examples I think you will find the process pretty easy.

List Perfect Square, Cube, and Fourth Roots
http://www.moomoomathblog.com/....2020/07/perfert-squa

Steps for cloning an animal
How Dolly the sheep was cloned and what we learned.
20 years ago Dolly the step was cloned from two sheets.
Here is how they cloned this sheep.
First, they took cells from the udder of one sheep. They grew these cells in the lab.
Next, they took the egg from another sheep and removed the nucleus.
These stopped cells were fused together and inserted into a female sheep who gave birth.

Keywords: Cloning dolly dolly the sheep
Clone nucleus
human cloning cloned sheep animal cloning embryonic stem cells
cloned animal somatic cell transfer
clone animals identical twins bioethics science ethics
sheep

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Please watch: "Study Skills Teacher's Secret Guide to your Best Grades"
https://www.youtube.com/watch?v=f3bsg8gaSbw
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*
For more Life Science videos and summaries see,
http://www.moomoomath.com/Midd....le-School-Science-an

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10）Writing a composition 作文
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Thousands of parents and educators are turning to the kids’ learning app that makes real learning truly fun. Try Kids Academy with
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Welcome our new video about easy and fun science experiments for kids.

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This video explains how to calculate the concentration of the solution in forms such as Molarity, Molality, Volume Percent, Mass Percent, and Mole Fraction. It also explains how to calculate the Molarity of the solution given mass percent and density.

Access The Full 1 Hour 20 Minute Video:
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Direct Link to The Full Video on Patreon:
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PDF Worksheet - 17 Practice Problems:
https://bit.ly/3QpptSk

Chemistry PDF Worksheets:
https://www.video-tutor.net/ch....emistry-basic-introd

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Full 1 Hour 20 Minute Video on YouTube:
https://www.youtube.com/watch?v=NL8quYmMOMs

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This physics video tutorial explains the concept of centripetal force and acceleration in uniform circular motion. This video also covers the law of universal gravitation, weightlessness, banked curves with friction, kepler's third law of planetary motion and other stuff. This video contains plenty of examples and practice problems.

Centripetal Acceleration:
https://www.youtube.com/watch?v=ZbLirQuT9uU

What Is a Centripetal Force?
https://www.youtube.com/watch?v=SQX22VVmRPs

Centripetal Force Physics Problems:
https://www.youtube.com/watch?v=ZZx3mYNk2wg

Tetherball Physics Problems:
https://www.youtube.com/watch?v=G0RikmNonoU

Tension Force - Vertical Circle:
https://www.youtube.com/watch?v=K9zIjUeI32k

_______________________________
Static Friction & Centripetal Force:
https://www.youtube.com/watch?v=dMgyy95uJUg

Normal Force on a Hill:
https://www.youtube.com/watch?v=Ec6btKP4qfg

Banked Turn Physics Problems:
https://www.youtube.com/watch?v=FWXT-IzgbP0

Non-Uniform Circular Motion:
https://www.youtube.com/watch?v=XlvD5_0FVSc

Gravitational Force:
https://www.youtube.com/watch?v=Ep1jIhHdf2A

______________________________
Universal Law of Gravitation:
https://www.youtube.com/watch?v=8CykJ3NgBQs

Gravitational Acceleration:
https://www.youtube.com/watch?v=kubaJtXz0c8

Gravitational Field Strength:
https://www.youtube.com/watch?v=8AUljAd_AyE

Satellite Speed:
https://www.youtube.com/watch?v=QIaAleG0Eb4

Kepler's Third Law of Motion:
https://www.youtube.com/watch?v=CCsbSq9wlyI

____________________________________
Kinetic Energy and Potential Energy:
https://www.youtube.com/watch?v=DyaVgHGssos

Work, Energy, and Power:
https://www.youtube.com/watch?v=_MR1Dp8-F8w

Final Exams and Video Playlists:
https://www.video-tutor.net/

Full-Length Videos and Worksheets:
https://www.patreon.com/MathSc....ienceTutor/collectio

Physics PDF Worksheets:
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This chemistry video tutorial explains how to solve calorimetry problems in thermochemistry. It shows you how to calculate the quantity of heat transferred using specific heat capacity during a temperature change process and using the enthalpy of fusion and heat of vaporization during a phase change process. This video contains plenty of examples and practice problems.

First Law of Thermodynamics:
https://www.youtube.com/watch?v=NyOYW07-L5g

Thermochemistry Equations:
https://www.youtube.com/watch?v=GL3gCBUua4c

Internal Energy, Heat, and Work:
https://www.youtube.com/watch?v=E7s-hIoyNqY

Thermochemical Equations:
https://www.youtube.com/watch?v=qDrcHR4tSdE

Specific Vs Molar Heat Capacity:
https://www.youtube.com/watch?v=IoHXMaiwT80

________________________________
Basic Calorimetry Problems:
https://www.youtube.com/watch?v=BGcDUybbTW0

Final Temperature Calorimetry Problems:
https://www.youtube.com/watch?v=lxMwyxvSqgk

Latent Heat of Fusion & Vaporization:
https://www.youtube.com/watch?v=dxtz2POUTJE

Coffee Cup Calorimeter:
https://www.youtube.com/watch?v=-XnUypVXE88

More Calorimeter Problems:
https://www.youtube.com/watch?v=F2cMvNDRqQA

__________________________________
Specific Heat Capacity Problems:
https://www.youtube.com/watch?v=ePm_N6RgLfk

Hess Law Problems:
https://www.youtube.com/watch?v=2ixEf2zpR8E

More Hess Law Problems:
https://www.youtube.com/watch?v=Idv2C8HBbug

Enthalpy of Formation & Heat Combustion:
https://www.youtube.com/watch?v=FP-VYfTYi8Y

Enthalpy Practice Problems:
https://www.youtube.com/watch?v=Xe_N7WYl5BI

__________________________________
Speed of Light, Frequency, & Wavelength:
https://www.youtube.com/watch?v=LgYMxH1LCdo

Final Exams and Video Playlists:
https://www.video-tutor.net/

Full-Length Videos and Worksheets:
https://www.patreon.com/MathSc....ienceTutor/collectio