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Volume of a Sphere

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Watch the next lesson: https://www.khanacademy.org/math/geometry/basic-geometry/cross-sections/v/vertical-slice-of-rectangular-pyramid?utm_source=YT&utm_medium=Desc&utm_campaign=Geometry

Missed the previous lesson?
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Geometry on Khan Academy: We are surrounded by space. And that space contains lots of things. And these things have shapes. In geometry we are concerned with the nature of these shapes, how we define them, and what they teach us about the world at large--from math to architecture to biology to astronomy (and everything in between). Learning geometry is about more than just taking your medicine ("It's good for you!"), it's at the core of everything that exists--including you. Having said all that, some of the specific topics we'll cover include angles, intersecting lines, right triangles, perimeter, area, volume, circles, triangles, quadrilaterals, analytic geometry, and geometric constructions. Wow. That's a lot. To summarize: it's difficult to imagine any area of math that is more widely used than geometry.

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.

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Cómo construir una tabla de valores a partir de la ecuación de una función, y representar los puntos correspondientes en la gráfica.

How does the human body work? What roles do the digestive, reproductive, and other systems play? Learn about human anatomy and the complex processes that help your body function.
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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/ap-biology/che

How elements relate to atoms. The basics of how protons, electrons and neutrons make up an atom.

Watch the next lesson: https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/introduction-to-the-atom/v/atomic-number-mass-number-and-isotopes?utm_source=YT&utm_medium=Desc&utm_campaign=chemistry

Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of algebra is helpful.

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.

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En esta clase: Español nivel intermedio A2, B1 con diálogos y preguntas directas e indirectas. Aprende español de manera divertida con nuestros videos interactivos.
¿Dónde estas?, ¿Qué harás el fin de semana?, ¿Sabes dónde esta mi móvil?, ¿Por qué viniste a España?, ¿Por qué estas feliz? un video lleno de preguntas directas e indirectas y muchas respuestas posibles para que practiques tu vocabulario.

Videos para aprender español

¡Bienvenidos! 😊 En este video aprenderás cómo expresar tus emociones en español usando adjetivos. ¿Te has preguntado cómo decir que estás feliz, triste, emocionado o nervioso? ¡Aquí te lo explicamos de forma sencilla y práctica!

Acompáñanos mientras repasamos algunos de los adjetivos más comunes para describir sentimientos y estados de ánimo, además de cómo usarlos correctamente con el verbo estar.

Este video es perfecto para quienes quieren mejorar su vocabulario en español y aprender a hablar sobre sus emociones en situaciones cotidianas. ¡No te lo pierdas!

Ideal para estudiantes de todos los niveles que quieran aprender español de manera interactiva y divertida. 🔥

📌 Temas cubiertos:

Cómo usar el verbo "estar" con adjetivos
Frases y vocabulario emocional en español
Expresiones comunes para describir sentimientos


Puntos clave:
Verbo "estar" + adjetivos:

Usamos estar con adjetivos para hablar de emociones y estados temporales (feliz, preocupado, cansado).
Es importante que el adjetivo concuerde en género (masculino/femenino) y número (singular/plural).


Adjetivos emocionales comunes:

Feliz (neutral, no cambia de género)
Preocupado/a (preocupados/as)
Cansado/a (cansados/as)
Enamorado/a
Emocionado/a
Triste (neutral, no cambia de género)


Emociones opuestas:

Feliz vs. Triste
Emocionado vs. Aburrido
Nervioso vs. Calmado


Intensificadores:

Muy: "Estoy muy cansada."
Un poco: "Estoy un poco preocupada."
Bastante: "Estoy bastante nerviosa."


Cambios de estado emocional:

A lo largo del día, las emociones pueden cambiar. Usar expresiones como:
"Primero estaba emocionada, luego preocupada."
"Ahora me siento aliviada."


Tiempos verbales:
En este video, la mayoría de las frases están en presente, que es el tiempo verbal más común cuando describimos cómo nos sentimos en el momento actual:
"Estoy" (del verbo estar) es la forma presente.


Si quisieran hablar de emociones pasadas, dirían "Estaba" (imperfecto).


Sugerencia para práctica:

Intenta escribir cómo te sientes hoy usando los adjetivos que vimos en el video y completa esta frase en los comentarios:

Hoy estoy....

Practice this lesson yourself on KhanAcademy.org right now:
https://www.khanacademy.org/math/trigonometry/unit-circle-trig-func/trig-functions-special-angles/e/trigonometric-functions-of-special-angles?utm_source=YT&utm_medium=Desc&utm_campaign=Trigonometry

Watch the next lesson: https://www.khanacademy.org/math/trigonometry/unit-circle-trig-func/trig-functions-special-angles/v/trig-functions-special-angles?utm_source=YT&utm_medium=Desc&utm_campaign=Trigonometry

Missed the previous lesson?
https://www.khanacademy.org/math/trigonometry/unit-circle-trig-func/Trig-unit-circle/v/matching-ratios-trig-functions?utm_source=YT&utm_medium=Desc&utm_campaign=Trigonometry

Trigonometry on Khan Academy: Big, fancy word, right? Don't be fooled. Looking at the prefix, tri-, you could probably assume that trigonometry ("trig" as it's sometimes called) has something to do with triangles. You would be right! Trig is the study of the properties of triangles. Why is it important? It's used in measuring precise distances, particularly in industries like satellite systems and sciences like astronomy. It's not only space, however. Trig is present in architecture and music, too. Now you may wonder...how is knowing the measurement and properties of triangles relevant to music?? THAT is a great question. Maybe you'll learn the answer from us in these tutorials!

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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Mathematics, Visualizing Fractions, Mortensen Math.com Kids tutorial, Montessori K-12 Homeschooling pre-school education online video, Algebra visualization with Mortensen Math.com manipulative colored blocks to visualizing algebraic expressions, visualizing mathematics,CONTACT US:
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👉Learn how to solve a system (of equations) by elimination. A system of equations is a set of equations which are collectively satisfied by one solution of the variables. The elimination method of solving a system of equations involves making the coefficient of one of the variables to be equal in all the equations that make up the system, in order to eliminate the variable using subtraction (or addition as the case may be). The coefficients can be made equal by multiplying the entire equation with a number which when multiplied to the coefficient of the variable to be eliminated gives the LCM of the coefficients of the variable to be eliminated in all the equations. Then we solve for the remaining variable(s).

After we have obtained the solution{s} for the remaining variable(s), we substitute the obtained solution into any of the original equations to obtain the solution of the eliminated variable.

✅ Solve a System of Three Equations - https://youtu.be/nLar40Dd_Us

00:00 intro
1:44 Multiply each equation
2:30 Add both equations
2:53 Solve for y

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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/

#Systemofequations #Algebraically #brianmclogan

Learn colors and patterns for kids with cars in this ABC pattern video from Learning Time Fun! Basic Patterns for children are essential as a precursor to higher level pattern learning found in kid's math and in various other subjects, including life in general. Our fun pattern video is appropriate for toddlers, preschoolers, kindergarten children, and ESL students.

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🎵 STREAM LTF SONGS 🎵
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TRANSCRIPT
Let's Find Patterns Together
Ready, let's go!

Red car, yellow car, blue car; Red car, yellow car, what comes next?
Is it a red car? No. Is it a blue car? Yes! (cheering)

Red car, yellow car, blue car. What comes next?
Is it a yellow car? No. Is it a red car? Yes! (cheering)

Yellow car, blue car, red car. What comes next?
That's right! A yellow car! (cheering)

Blue car, red car, yellow car, blue car.

Great Job!

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Find the General Term of the Arithmetic Sequence with Fractions

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Thank you:)

https://www.patreon.com/homeschoolpop Learn all about the phases of the Moon in this fun learning video for kids! You will also learn two fancy words: waxing and waning! You'll be able to identify the phases of the Moon in no time!

00:00 The Moon goes through phases
1:05 New Moon
2:18 Waxing crescent
3:22 First quarter
4:21 Waxing gibbous
5:08 Full Moon
6:58 Waning gibbous
7:35 Last quarter
8:31 Waning crescent
9:18 Review


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Blippy Trance by Kevin MacLeod
Link: https://incompetech.filmmusic.....io/song/5759-blippy-
License: http://creativecommons.org/licenses/by/4.0/

Electro Cabello by Kevin MacLeod
Link: https://incompetech.filmmusic.....io/song/3705-electro
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Fuzzball Parade by Kevin MacLeod
Link: https://incompetech.filmmusic.....io/song/5044-fuzzbal
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Electrodoodle by Kevin MacLeod
Link: https://incompetech.filmmusic.....io/song/3707-electro
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Sock Hop by Kevin MacLeod
Link: https://incompetech.filmmusic.....io/song/4387-sock-ho
License: https://filmmusic.io/standard-license

Image credits:
New Moon Cartoon Image
Moon Phase: New Moon. Daniel Kmiec. Own Work.https://creativecommons.org/licenses/by/3.0/

Waxing Crescent Cartoon Image
Moon Phase. Daniel Kmiec. Own Work.https://creativecommons.org/licenses/by/3.0/  

First Quarter Cartoon Image
Moon Phase. Daniel Kmiec. Own Work.https://creativecommons.org/licenses/by/3.0/    

Waxing Gibbous Cartoon Image
Moon Phase. Daniel Kmiec. Own Work.https://creativecommons.org/licenses/by/3.0/   

Full Moon Cartoon Image
Moon Phase. Daniel Kmiec. Own Work.https://creativecommons.org/licenses/by/3.0/     

Waning Gibbous Cartoon Image
Moon Phase. Daniel Kmiec. Own Work.https://creativecommons.org/licenses/by/3.0/     

Third Quarter Cartoon Image
Moon Phase. Daniel Kmiec. Own Work.https://creativecommons.org/licenses/by/3.0/
Waning Crescent Cartoon Image
Moon Phase. Daniel Kmiec. Own Work.https://creativecommons.org/licenses/by/3.0/    

Waxing Crescent Moon. Dorset, England, United Kingdom.
8 November 2013. Ian Kirk from Broadstone, Dorset, UK
https://creativecommons.org/licenses/by/2.0/

First Quarter Moon pictureA photo of the moon last March9 May 2007. Daniel Hershman from Federal Way, US
https://creativecommons.org/licenses/by/2.0/
Waxing Gibbous pictureThe moon, as seen from Belgium. Image taken with a Nikon D3s and a 600mm F4 lens, with an adapter making a 1680mm F11,2 virtual lens.11 June 2011. Own Work. Lviatour.  https://creativecommons.org/licenses/by/2.0/
Waning Gibbous picture9 December 2014. NASA Goddard Space Flight Center from Greenbelt, MD, USAhttps://creativecommons.org/licenses/by/2.0/

Thanks for learning with me today! I hope to see you next video!

Daniel
"Homeschool Pop"

AI platforms have reached a turning point when it comes to #creativity, explicitly moving to show how they can empower today’s #creatives vs. talking about AI’s future potential. In the face of lingering fears around copyright, creative careers and AI’s role in creativity, firms like #OpenAI have recruited its first Global chief and announced a feature length film.

Competitor Anthropic has launched a new ad ‘Keep Thinking with Claude’, which tries to directly defuse AI worry for doers, creatives and problem solves. Striking a simultaneously retro and inspiring tone, the ad leverages a take on the refrain ‘There’s never been a better time to be alive’, with ‘There’s never been a better time to be a problem solver’. The challenge, potentially true with both, is while it is academically true, it's often emotionally wrong. Asking the viewer to put emotional fears aside in rational ways often struggles to deliver the intended impact.


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Least Common Multiple: Basic Method
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People claim that 70-80% of household dust is dead skin, but is it true?
Thanks to Google for sponsoring this video! Learn more about Search here: https://www.google.com/search/howsearchworks/

Special thanks to J.M.E.H van Bronswijk, author of 'House Dust Biology'. We exchanged emails to make sure I got my facts straight for this video. Below is an excerpt from her email to me, responding to my claims that start with a dash:

- Around half of airborne dust particles under 100um are skin scales
This is true for climates, regions and seasons where people live mostly indoors.
The 1 to 2 g of skin scales shed each 24 hours will end up in places where people are present (and rub their skin or have textile moving over the skin).
You can also look at it from a different angle: What else has the same size and could contribute? That will usually be pollen from outdoor sources, also depending on season, region and climate, as well as the ventilation regime of the building.
However, taken as the median value over a whole year, I consider your statement correct for regions with a temperate climate.

- 53% of dust particles vacuumed from a mattress were found to be skin scales
It depends a little on the type of mattress. For polyether mattresses the amount may even be larger.
For mattresses made of natural material it could be less since the mattress-material will also give off small particles.

- larger particles consist mostly of fibers, eg. cotton, paper, wool, synthetics
That's true .. including bread crumbs ..... 🙂

- skin scales seem to form a larger fraction of dust where we spend more time, e.g. in or near bed.
..... and on the couch used to view television or be active in gaming.
It has to do with the constant production of skin scales over the 24 hours.

- skin scales form a smaller fraction of dust if there are significant other sources, e.g. carpeting, dirt from outside etc.
Yes, everyting you walk on with your shoes or that recieves dirt from the outside with other means, will have a lessr percentage of human skin scales.
However, do not forget the skin scales of pets that will also be an active allergen for many people, and a food source for house dust mites.

Information on dust particle size ©ISO. This material is adapted from ISO 7708:1995, with permission of the American National Standards Institute (ANSI) on behalf of the International Organization for Standardization. All rights reserved.

Research and Writing by AJ Fillo and Derek Muller
Editing, Audio Mix & Master, and Computer animations by Jonny Hyman
Dust and character animation by Ivy Tello
Filming by Raquel Nuno
Thumbnail by Fictionalhead https://www.youtube.com/fictionalhead

Intro Music composed by Jonny Hyman
Additional Music from Epidemic Sound: Colored Spirals, Observations

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Learn to Play Chess | Double Check | Kids Academy

Double check is a check by two pieces all at the same time. When it comes to playing chess, the double check is always considered equally as a single check.

The only difference lies in the symbolic representation of both the terms. A single check is represented by “+” and a double check is represented by “++”. However, the sign “++” is sometimes used to indicate checkmate too.

In double check, one piece moves to deliver a check and reveal an already discovered check that it was blocking before. Discovery is the best way to destroy your opponent.

You can learn more about the double check move on the internet. All you have to do is to type “learn chess for kids” online and you will have several results pop up on your screen.

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Some killer asteroids were found only days before flyby. If they had struck Earth, the power of thousands of nuclear bombs would have flattened cities and killed millions.
What if we spotted a 100-meter asteroid just two weeks before collision? Can humanity be saved?


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Many thanks to our wonderful Patreons (from http://kgs.link/patreon) who support us every month and made this video possible:
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Pre-order our book YOU ARE AN ARTIST (which includes new assignments!) here: http://bit.ly/2kplj2h

In which we feature some of the best and most interesting responses to Robyn O'Neil's Art Assignment to draw a psychological landscape: http://youtu.be/qwOXumLJgGg.

Many thanks to all of you who have submitted responses, and we hope you continue to make psychological landscapes and share them with us. Extra special thanks to those of you whose responses we feature in this video:

Beatrice: http://lisolachenonce.tumblr.c....om/post/88255591434/

Linda and Dee: http://particlesofwords.com/20....14/04/26/art-assignm

Noncommittal Writing: http://forgetisawyou.tumblr.co....m/post/83922743158/a

Leo Quinn: http://web.stagram.com/p/70589....7416284688870_440765

Sylvia Chin: https://www.facebook.com/photo.php?fbid=10152087341267012&set=o.436933256394748&type=1&theater

Andrew Orr: https://twitter.com/solthree/s....tatus/45947330804897

The Political (Sur)reality: http://summited.tumblr.com/pos....t/85085877361/art-as

Meg Gilbert: https://www.youtube.com/watch?v=6_NQsJjipvg

http://anonymousprisonerofthel....abyrinth.tumblr.com/

Hannah Scharton: http://web.stagram.com/p/70831....5052051082987_331301

Ana: http://web.stagram.com/p/70584....1904991279319_536771

Things I Wish I had Done But Didn't Do: http://the-interrabang.tumblr.....com/post/84395812871

Saranna00: https://www.youtube.com/watch?v=x-Fah8rRZno&list=PLrqNvF6-PBuOB9YWiT8qcXl6iEBS8vERC

Juliet: http://pluviomancy.tumblr.com/....post/84359160085/the

Kenton Visser: http://kentonblogs.tumblr.com/....post/85286714257/anh