اخترنا مقابلة أجرتها منظمة "روحانية" مع ساحرة روسية، لنستعرض من خلالها بعض النقاط المهمة عن #السحر، وأهمها:
1- كيف يختار الشياطين بعض الإنس لاستدراجهم إلى السحر.
2- مفاهيم يساء فهمها مثل الطاقة والزوهريين.
3- كيف تحمي الأذكار والصلاة وقراءة القرآن المسلمين من السحر.
إعداد وتقديم أحمد دعدوش

بدعمكم نستمر
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فيزياء 101
إعداد و تقديم :: أحمد صبحي

تشابتر 3 :: المتجهات
من كتاب سيروي

التحويل من Cartesian إلى Polar
إنتاج الفيزياء للجميع A+ FYsics

Physics 101
Presented By :: Ahmed Subhi

Physics for Scientists and Engineers by Raymond A. Serway and John W. Jewett
Chapter 3 :: Vectors
Coordinate Systems

Converting from Cartesian coordinate to polar coordinate and vice versa
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https://ocw.mit.edu/resources/....res-18-007-calculus-
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الاحبة الطلاب في السؤال الثمن الدقيقه22.50 وبعدها
ِAx=65cos(30)=56.3
مش 26.2

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https://drive.google.com/file/....d/1GB7fMmzbur7vRejQJ

Quantum physics deals with the foundation of our world – the electrons in an atom, the protons inside the nucleus, the quarks that build those protons, and the photons that we perceive as light. These constitute everything that we are made of, both matter and energy. But how is it any different from regular physics? The 'regular' physics is the physics that deals with Newton’s laws of motion and its related mechanics. This is more formally called Classical Physics.

This is the physics of our day-to-day lives—the rolling of balls, the rotation of the earth, and the mechanics of engines. Quantum physics deals with particles that are incredibly small and hence, the laws of classical physics don’t apply in this world. In this video, we discuss the meaning of quantum physics and how is it going to change how we perceive the world around us.

#quantumphysics #quantummechanics #quantumworld

References:
https://scienceexchange.caltec....h.edu/topics/quantum
https://www.insidescience.org/....second-quantum-revol
https://link.springer.com/chap....ter/10.1007/978-94-0

Original Article Link: https://www.scienceabc.com/pur....e-sciences/what-is-q

If you wish to buy/license this video, please write to us at admin@scienceabc.com.

Voice Over Artist: John Staughton ( https://www.fiverr.com/jswildwood )

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Why does shaken soda explode? Does ice melt first in fresh or salt water?
Thank you Squarespace for sponsoring this video. Go to https://squarespace.com to save 10% off your first purchase of a website or domain using code: VERITASIUM

This video features experiments that have been shown to me by science teachers over the years. Does ice melt fast in salt water or fresh water was an experiment introduced to me at the Utah Science Teachers' conference. The ring of metal over a chain demo came from a teachers event in Florida. The idea shaking a carbonated drink increases pressure came from an email.

Special thanks to Petr Lebedev for building the pressure gauge.

Links to literature are below:
Victims of the pop bottle, by Ted Willhoft. New Scientist, 21 August 1986 p.28

Carbonation speculation
The Physics Teacher 30, 173 (1992); https://doi.org/10.1119/1.2343501

Agitation solution
The Physics Teacher 30, 325 (1992); https://doi.org/10.1119/1.2343556

Filmed by Cristian Carretero, Jordan Schnabel, Jonny Hyman, and Raquel Nuno

Music from https://epidemicsound.com "Seaweed" "Quietly Tense" "Mind Shift" "Observations"

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/sc....ience/chemistry/atom

A big picture view of chemistry and why it is fascinating. How chemistry relates to math and other sciences.

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Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate or volunteer today!

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This is a basic introduction to balancing chemical equations. I go over the Law of Conservation of Mass, and why we balance equations. I show you two step-by-step examples of how to balance basic chemical equations.


Instagram: @chemistry_kelly
Twitter: @chemistry_kelly

Chemistry 102
Chapter 14: Chemical Equilibrium
(University of Jordan) || Part 1
Noura Taqi Aldeen
Book: Chemistry The Molecular Nature of Matter
Book [PDF] : https://drive.google.com/open?....id=1o63LCduOEQn9K5x2
Nerd Team

The organic molecules that make up life on Earth are more than just the 2-D structures we’ve been drawing so far. Molecules have 3-D shapes that help us understand what they can do. In this episode of Crash Course Organic Chemistry, we’ll learn how orbital hybridization and valence bond theory can help us explain 3D molecular structures and about constitutional and geometric isomers.

Episode Sources:
Discovery of DNA Double Helix: Watson and Crick | Learn Science at Scitable
Citation: Pray, L. (2008) Discovery of DNA structure and function: Watson and Crick. Nature Education 1(1):100
https://www.nature.com/scitabl....e/topicpage/discover
Nature 1953.
Watson J.D., Crick F.H. A structure for deoxyribose nucleic acid. Nature 1953;171:737–738.
Harding, S. E., Channell, G., & Phillips-Jones, M. K. (2018). The discovery of hydrogen bonds in DNA and a re-evaluation of the 1948 Creeth two-chain model for its structure. Biochemical Society transactions, 46(5), 1171–1182. doi:10.1042/BST20180158

Series Sources:
Brown, W. H., Iverson, B. L., Ansyln, E. V., Foote, C., Organic Chemistry; 8th ed.; Cengage Learning, Boston, 2018.
Bruice, P. Y., Organic Chemistry, 7th ed.; Pearson Education, Inc., United States, 2014.
Clayden, J., Greeves, N., Warren., S., Organic Chemistry, 2nd ed.; Oxford University Press, New York, 2012.
Jones Jr., M.; Fleming, S. A., Organic Chemistry, 5th ed.; W. W. Norton & Company, New York, 2014.
Klein., D., Organic Chemistry; 1st ed.; John Wiley & Sons, United States, 2012.
Louden M., Organic Chemistry; 5th ed.; Roberts and Company Publishers, Colorado, 2009.
McMurry, J., Organic Chemistry, 9th ed.; Cengage Learning, Boston, 2016.
Smith, J. G., Organic chemistry; 6th ed.; McGraw-Hill Education, New York, 2020.
Wade., L. G., Organic Chemistry; 8th ed.; Pearson Education, Inc., United States, 2013.

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Try out my quantum mechanics course (and many others on math and science) on Brilliant using the link https://brilliant.org/sabine. You can get started for free, and the first 200 will get 20% off the annual premium subscription.

This video comes with a quiz: https://quizwithit.com/start_t....hequiz/1689034259496

Why do particle physicists constantly make wrong predictions? In this video, I explain the history and status of the problem.

My list with "good" and "bad" problems in the foundations of physics is here:

http://backreaction.blogspot.c....om/2019/01/good-prob

Note: I don't mean to say this is a complete list!

👉 Transcript and References on Patreon ➜ https://www.patreon.com/Sabine
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19:37 What Will Happen?
20:04 Learn Physics on Brilliant

#science #physics #particlephysics

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Biology is the study of life—a four-letter word that connects you to 4 billion years worth of family tree. The word “life” can be tricky to define, but a shared set of characteristics helps biologists identify living things. In this episode of Crash Course Biology, you’ll learn how all of life is connected, and why studying biology can help us better understand ourselves and our relationship to all living things.

Chapters:
Welcome to Crash Course Biology! 00:00
Life's Characteristics 2:14
Is a Virus Alive? 6:18
Life Beyond Earth 8:52
Biology and You 10:03
All Life is Connected 10:44
Review & Credits 11:59

Sources: https://docs.google.com/docume....nt/d/1GLDtAXE6ekg4Ch

This series was produced in collaboration with HHMI BioInteractive, committed to empowering educators and inspiring students with engaging, accessible, and quality classroom resources. Visit https://BioInteractive.org/CrashCourse for more information.

Check out our Biology playlist here: https://www.youtube.com/playli....st?list=PL8dPuuaLjXt

Watch this series in Spanish on our Crash Course en Español channel here: https://www.youtube.com/playli....st?list=PLkcbA0DkuFj

Crash Course Biology is hosted by Dr. Samuel Ramsey. Learn more about him here: https://www.drsammy.online/

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The cell is the basic unit of life, and our understanding of it has advanced as science, and the tools available to scientists, has advanced. In this episode of Crash Course Biology, we’ll take a look at the difference between prokaryotic and eukaryotic cells, take a guided tour of the eukaryotic cell, and learn why most cells are small. We’ll explore the eukaryotic cell’s surprising beginnings through an endosymbiosis that occurred about 1.5 billion years ago.

Chapters:
Introduction to the Cell 00:00
Classical Cell Theory 2:12
Parts of a Cell 5:37
Endosymbiosis 9:11
Modern Cell Theory 10:41
Review & Credits 12:23

This series was produced in collaboration with HHMI BioInteractive, committed to empowering educators and inspiring students with engaging, accessible, and quality classroom resources. Visit https://BioInteractive.org/CrashCourse for more information.

Check out our Biology playlist here: https://www.youtube.com/playli....st?list=PL8dPuuaLjXt

Watch this series in Spanish on our Crash Course en Español channel here: https://www.youtube.com/playli....st?list=PLkcbA0DkuFj Sources: https://docs.google.com/docume....nt/d/1GLDtAXE6ekg4Ch

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How does your body regulate your internal conditions? How does it detect changes and respond to them? What is an automatic control system and how does it use negative feedback?
Find out all this and more in less than 5 minutes!

Hank introduces us to that wondrous molecule deoxyribonucleic acid - also known as DNA - and explains how it replicates itself in our cells.

References:
http://www.nature.com/nature/dna50/watsoncrick.pdf
http://publications.nigms.nih.....gov/thenewgenetics/c
http://rst.gsfc.nasa.gov/Sect20/A12.html
http://www.nature.com/scitable..../topicpage/discovery
http://www.uic.edu/classes/phy....s/phys461/phys450/AN
http://www.buzzle.com/articles..../dna-replication-ste
http://www.dnareplication.info..../stepsofdnareplicati
http://salamandercandy.wordpre....ss.com/2007/02/05/ho
http://www.sdsc.edu/ScienceWomen/franklin.html
http://www.fmi.ch/members/mari....lyn.vaccaro/ewww/dna
http://www.strangescience.net/rfranklin.htm

1:41 link to Biological Molecules http://www.youtube.com/watch?v=H8WJ2KENlK0

Table of Contents:
1) Nucleic Acids 1:30
2) DNA
-A) Polymers 1:53
-B) Three Ingredients 2:12
-C) Base Pairs 3:45
-D) Base Sequences 4:13
3) Pop Quiz 5:07
4) RNA 5:36
-A) Three Differences from DNA 5:43
5) Biolography 6:16
6) Replication 8:49
-A) Helicase and Unzipping 9:22
-B) Leading Strand 9:38
-C) DNA Polymerase 10:08
-D) RNA Primase 10:24
-E) Lagging Strand 10:46
-F) Okazaki Fragments 11:07
-F) DNA Ligase 11:47

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