Today Phil’s explaining the stars and how they can be categorized using their spectra. Together with their distance, this provides a wealth of information about them including their luminosity, size, and temperature. The HR diagram plots stars’ luminosity versus temperature and most stars fall along the main sequence, where they live most of their lives.


Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/product....s/crashcourse-astron

--
Chapters:
Introduction: Stars 00:00
Stellar Spectra 1:07
Star Classifications 3:03
Why Are There No Green Stars? 4:00
Luminosity Depends on Size and Temperature 5:27
The HR Diagram 6:33
Main Sequence Stars 7:27
Other Stars on the HR Diagram 8:17
Review 9:50
--

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--

PHOTOS/VIDEOS
Stars http://www.nasa.gov/images/con....tent/703724main_potw [credit: ESA/Hubble & NASA]
Spitzer Spectrum http://www.jpl.nasa.gov/spacei....mages/details.php?id [credit: NASA/JPL-Caltech/Leiden/SRON]
Sun spectrum https://www.noao.edu/image_gal....lery/html/im0600.htm [credit: N.A.Sharp, NOAO/NSO/Kitt Peak FTS/AURA/NSF]
Annie Jump Cannon https://en.wikipedia.org/wiki/....Annie_Jump_Cannon#/m [credit: New York World-Telegram and the Sun Newspaper]
Cecilia Payne-Gaposchkin https://en.wikipedia.org/wiki/....Cecilia_Payne-Gaposc [credit: Smithsonian Institution]
OBAFGKM https://www.noao.edu/image_gal....lery/html/im0649.htm [credit: NOAO/AURA/NSF]
Betelgeuse http://www.eso.org/public/usa/images/eso0927e/ [credit: ESO/Digitized Sky Survey 2. Acknowledgment: Davide De Martin]
Sirius https://www.nasa.gov/multimedi....a/imagegallery/image [credit: NASA, ESA, H. Bond (STScI) and M. Barstow (University of Leicester)]
Solar AM0 spectrum with visible spectrum background https://commons.wikimedia.org/....wiki/File:Solar_AM0_ [credit: Danmichaelo, Wikimedia Commons]
Blue sky http://www.pexels.com/photo/sk....y-sunny-clouds-cloud [credit: Skitter Photo]
Hawaii sunset photo [credit: Phil Plait]
Hertzsprung-Russell Diagram https://commons.wikimedia.org/....wiki/File:ESO_-_Hert [credit: ESO]

Geometric probabilities, and probabilities in general, allow us to guess how long we'll have to wait for something to happen. Today, we'll discuss how they can be used to figure out how many Bertie Bott's Every Flavour Beans you could eat before getting the dreaded vomit flavored bean, and how they can help us make decisions when there is a little uncertainty - like getting a Pikachu in a pack of Pokémon Cards! We'll finish off this unit on probability by taking a closer look at the Birthday Paradox (or birthday problem) which asks the question: how many people do you think need to be in a room for there to likely be a shared birthday? (It's likely much fewer than you would expect!)

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COLLISIONS! A big part of physics is understanding collisions and how they're not all the same. Mass, momentum, and many other things dictate how collisions can be unique. In this episode of Crash Course Physics, Shini sits down to lead us through an understanding of collisions. Plus, she brings along our old friend Sir Isaac Newton.

--

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

--

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Why are some countries rich? Why are some countries poor? In the end it comes down to Productivity. This week on Crash Course Econ, Adriene and Jacob investigate just why some economies are more productive than others, and what happens when an economy is mor productive. We'll look at how things like per capita GDP translate to the lifestyle of normal people. And, there's a mystery.

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It is now time to meet the system that helps your brain stay in touch with the outside world. We follow up last week's tour of the central nervous system with a look at your peripheral nervous system, its afferent and efferent divisions, how it processes information, the reflex arc, and what your brain has to say about pain.

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: https://apple.co/3d4eyZo
Download it here for Android Devices: https://bit.ly/2SrDulJ

Chapters:
Introduction: Peripheral Nervous System 00:00
Sensory Nerve Receptors: Thermoreceptors, Photoreceptors, Chemoreceptors, Mechanoreceptors, and Nociceptors 0:56
What is Pain? 1:54
How Pain is Processed 2:51
Pain Threshold vs Pain Tolerance 3:50
How the Brain Processes Pain 4:25
Afferent and Efferent Divisions 5:42
Five Steps of the Reflex Arc 6:38
What the Brain Says About Pain 8:09
Review 9:09
Credits 9:39

***

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***SUPPORTER THANK YOU!***

Thank you so much to all of our awesome supporters for their contributions to help make Crash Course possible and freely available for everyone forever:

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The first step in honing your new study skills is to take better notes. This week Thomas will tell you everything you need to know to come to class prepared and find a note-taking system that will help you retain and review like a champ.

Crash Course is made with Adobe Creative Cloud. Get a free trial here: https://www.adobe.com/creative....cloud/catalog/deskto

Resources:

Study on computer vs. paper note-taking: http://journals.sagepub.com/do....i/pdf/10.1177/095679
Evernote: https://evernote.com/
OneNote: https://www.onenote.com/
Dropbox Paper: https://paper.dropbox.com
Coggle (mind-mapping tool): https://coggle.it/


***

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Mark, Les Aker, Bob Kunz, Mark Austin, William McGraw, Jeffrey Thompson, Ruth Perez, Jason A Saslow, D.A. Noe, Shawn Arnold, Eric Prestemon, Malcolm Callis, Advait Shinde, Rachel Bright, Khaled El Shalakany, Ian Dundore, Tim Curwick, Ken Penttinen, Dominic Dos Santos, Indika Siriwardena, Caleb Weeks, Kathrin Janßen, Nathan Taylor, Andrei Krishkevich, Brian Thomas Gossett, Chris Peters, Kathy & Tim Philip, Mayumi Maeda, Eric Kitchen, SR Foxley, Tom Trval, Cami Wilson, Moritz Schmidt, Jessica Wode, Daniel Baulig, Jirat
--

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Today, Craig Benzine is going to tell you about the Supreme Court's most important case, Marbury v. Madison, and how the court granted itself the power of judicial review. Judicial review is the power to examine and invalidate actions of the legislative and executive branches. It happens at both the state and federal court levels, but today we're going to focus primarily on the court at the top - the Supreme Court of the United States. Now it's important to remember that the court has granted itself these powers and they aren't found within the Constitution, but as with the executive and legislative branches, the courts rely heavily on implied powers to get stuff done.

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Support is provided by Voqal: http://www.voqal.org

All Flickr.com images are licensed under Creative Commons by Attribution 2.0

https://creativecommons.org/li....censes/by/2.0/legalc

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In this video you will find a compilation of videos that are focused on learning the vowels and numbers 1-10. By watching this video you will encounter how to write, pronounce and use each vowel in a sentence. Each vowel explanation is followed by a catchy song. Also, you will discover fun ways to learn how to count, such as with Suki the cookie. Come with us on this fun learning adventure! This video belongs to a collection of videos that teaches kids the basic foundations of knowledge. These videos always engage children with catchy songs and creative characters.

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We only upload our own content, designed by educators so that children smile and learn while watching a video.

All of our content reinforces educational values, encouraging the use of multiple intelligences and language learning.

If you like our videos, download “The Smart Library” now. You’ll discover more than 70 interactive games and stories for children designed by educators. The stories are based on VALUES like friendship, respect, and generosity, and our games cover all of the MULTIPLE INTELLIGENCES. All our content is in SPANISH, ENGLISH, FRENCH, ITALIAN and PORTUGUESE.

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Educational video for children to learn about many things related to cooking. This compilation includes videos of kitchen-related verbs, utensils, objects, kitchen furniture, fun family recipes such as tiramisu or a watermelon smoothie and even a story to teach you about the importance of teamwork.

This is an excellent resource for early childhood education and the early elementary school.

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If you like our videos, download Smile and Learn now. You’ll discover thousands of activities for children aged 3 to 12 yeards, all designed by educators. We have hundreds of games, interactive stories and videos in five languages: English, Spanish, Portuguese, Italian, Turkish and French. Try a month for free and start the adventure!

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This is an educational video where children can learn more about making healthy food. In this video children will learn to make a delicious watermelon smoothie by using seedless watermelon, mint leaves, lemon juice, soy milk, yogurt, and ice.

This video belongs to a collection of videos that teach children about cooking and healthy eating.

Thanks for visiting us! If you want your children to smile and learn, subscribe! :D

We only upload our own content, designed by educators so that children smile and learn while watching a video.

All of our content reinforces educational values, encouraging the use of multiple intelligences and language learning.

If you like our videos, download “The Smart Library” now. You’ll discover more than 70 interactive games and stories for children designed by educators. The stories are based on VALUES like friendship, respect, and generosity, and our games cover all of the MULTIPLE INTELLIGENCES. All our content is in SPANISH, ENGLISH, FRENCH, ITALIAN and PORTUGUESE.

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This video presents a new and delicious recipe from Italy: the well known dessert called: Tiramisu. You only need chocolate, coffee, mascarpone cheese, eggs and some biscuits. It's perfect for cooking it together as a family!

This video belongs to a collection of videos that teaches children about cooking and healthy eating.

Thanks for visiting us! If you want your children to smile and learn, subscribe! :D

We only upload our own content, designed by educators so that children smile and learn while watching a video.

All of our content reinforces educational values, encouraging the use of multiple intelligences and language learning.

If you like our videos, download “The Smart Library” now. You’ll discover more than 70 interactive games and stories for children designed by educators. The stories are based on VALUES like friendship, respect, and generosity, and our games cover all of the MULTIPLE INTELLIGENCES. All our content is in SPANISH, ENGLISH, FRENCH, ITALIAN and PORTUGUESE.

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The Earth is surrounded by the atmosphere, a thin gaseous layer that allows some of the sun's radiation to penetrate. To this effect, the atmosphere has greenhouse gases, whose mission is to absorb part of the sun's energy and maintain the temperature of the planet. One of the main greenhouse gases is CO2 or carbon dioxide.

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If you like our videos, download Smile and Learn now. You’ll discover thousands of activities for children aged 3 to 12 years, all designed by educators. We have hundreds of games, interactive stories and videos in five languages: English, Spanish, Portuguese, Italian, Turkish and French. Try a month for free and start the adventure!

www.smileandlearn.com

Educational video for children to learn how to classify plants into two types: non-flowering plants, called cryptogams and flowering plants, called phanerogams. In this video children will learn in depth the characteristics of both types. Thanks to easy and fun examples, children will discover the types of plants that exist according to their ability to produce flowers and the parts that make them up.

This is a very useful and interesting video resource for children to learn how to classify plants according to their flowers. It is an excellent video for elementary education.

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If you like our videos, download Smile and Learn now. You’ll discover thousands of activities for children aged 3 to 12 years, all designed by educators. We have hundreds of games, interactive stories and videos in five languages: English, Spanish, Portuguese, Italian, Turkish and French. Try a month for free and start the adventure!

www.smileandlearn.com

Educational video for children to learn what is an earthquake. An earthquake, also called seism or tremor, is a sudden ground motion that occurs due to the collision of tectonic plates against each other. Tectonic plates are like the puzzle pieces that form the earth's surface that are constantly moving.

This is a video resource that compiles information about earthquakes, it is ideal for elementary school natural science.

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fractions with different numerators and denominators | how to solve fractions in hindi | fractions adding and subtracting | division of fractions with different denominators | fractions division mixed numbers



Quadratic Equations Class 10

https://www.youtube.com/playli....st?list=PLEu4go873sk

Calculus and Analytical Geometry

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BSc Maths 1st Year

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Sir Shahid Mathematics Videos

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Derivatives in Urdu

https://www.youtube.com/playli....st?list=PLEu4go873sk

Integral Calculus in Hindi

https://www.youtube.com/playli....st?list=PLEu4go873sk

Differential Calculus in Hindi

https://www.youtube.com/playli....st?list=PLEu4go873sk

#fractionsimplification
#fractionsubtract
#fractionaddition

Hello Friends, Welcome To Maths-Logic in Telugu !!!

Addition of Fraction by LCM method || Adding Fractions with Common and Different Denominators

Cover Topic :-
1. Addition of Fraction
2. Adding fractions
3. Addition of Fraction by LCM method
4. Adding Fractions with Common Denominators
5. Adding Fractions with Different Denominators
6. Addition of unlike fractions
7. Add Fractions With Unlike Denominators
8. Adding three fractions
9. Fraction Based simplification

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#mathslogicintelugu #fractions #additionoffraction #AdditionofFractionbyLCMmethod #Additionofunlikefractions #howtoaddfractions #addfractions

Hi guys! This video discusses and reviews the operations on fractions. We will solve several examples on how to add, subtract, multiply and divide fractions. Happy learning and enjoy watching! #enginerdmath #operationsonfractions#mathoperations

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BASIC MATH PLAYLIST
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fractions with different denominators | how to solve mixed fractions addition | Subtraction | fraction to lowest terms | Form | fractions class 6 | 7 | NCERT





Sir Shahid Mathematics Videos

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#fractionaddition
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👉 Learn how to find the slope between two points. The slope of a line is the steepness of the line. The horizontal line has a zero slope while the vertical line has an undefined slope. To determine the slope of a line passing through two points, we need to know the coordinates of 2 points on the line. Then the slope of the line is given by the quotient of the difference between the y-coordinates and the difference between the x-coordinates. i.e. slope = (y2 - y1) / (x2 - x1).

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✅Find the Slope From a Table
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✅Find the Slope From a Graph
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✅Find the Slope From a Word Problem
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅How to Find The Slope Between Two Points
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM

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👨‍👩‍👧‍👧 About Me: I make short, to-the-point online math tutorials. I struggled with math growing up and have been able to use those experiences to help students improve in math through practical applications and tips. Find more here: https://www.freemathvideos.com/about-me/

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