Alexander Brodsky
Alexander Brodsky
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Lecture 1. The Law of Gravitation
Richard Feynman - Messenger Lectures at Cornell - The Character of Physical Law
Transcript (English & Russian): tinyurl.com/ysrxn2xx
00:00 - Cornell University
01:15 - Introduction by Provost Dale R. Corson
06:04 - The lecture begins. I want to talk about general characteristics of physical laws.
10:00 - What is this law of gravitation?
11:35 - The history of the law
14:16 - The three laws of Kepler
17:00 - What makes the planets go around? (Galileo - the principle of inertia)
18:33 - When it doesn’t go in a straight line, then what? (Newton)
22:25 - Generalization: every object attracts every other object
25:03 - A number of new phenomena now had obvious explanations (tides)
27:14 - The tests of Newton’s law became much more stringent (Ole Romer determines the velocity of light)
29:20 - The mutual attraction of the planets changes their orbits
31:18 - How far does this law extend?
32:53 - How about a bigger distance?
36:17 - The law of gravitation is different than many of the other laws
38:32 - The formation of new stars
40:21 - Cavendish’s experiment
42:23 - Is the pull exactly proportional to the mass?
45:22 - About the relation of gravitation to other forces
46:34 - Let’s look again at the law of electricity
49:22 - Two more things about the theory of gravitation
50:48 - But what is this gravity?
51:24 - What does gravity have in common with the other laws?
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Відео

Lecture 2. The Relation of Mathematics and Physics
Переглядів 1510 місяців тому
Richard Feynman - Messenger Lectures at Cornell - The Character of Physical Law
Lecture 1. The Law of Gravitation
Переглядів 1810 місяців тому
Richard Feynman - Messenger Lectures at Cornell - The Character of Physical Law Trnscript in English and in Russian: docs.google.com/document/d/1nOitSnasu5qYN8Bkzj8tYjmy4UVFes3mR9xaclNaemA/edit?usp=sharing 00:00 - Cornell University 01:20 - Introduction by Provost Dale R. Corson 06:00 - The lecture begins. I want to talk about general characteristics of physical laws. 10:09 - What is this law o...
Stave 1. Marley’s Ghost - Scene 02. Nephew
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A Christmas Carol by Charles Dickens
Chapter 01. Tom Plays, Fights, and Hides
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The Adventures of Tom Sawyer by Mark TWAIN docs.google.com/document/d/1R3-o9MyE9ynkaxejA0if5Q7wFk_UPFp1k_iFO2ZP7eo/edit?usp=sharing 00:10 - Episode 1. You Tom! 02:36 - Episode 2. Aunt Polly decides upon her duty 04:11 - Episode 3. Supper 07:50 - Episode 4. Tom practices music 09:05 - Episode 5. The challenge 15:14 - Episode 6. A private entrance
Chapter 02. Fatty Has Some Ideas
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Mystery #03 - The Mystery of the Secret Room 00:02 - Page 01 00:30 - Page 02 00:56 - Page 03 01:16 - Page 04 01:52 - Page 05 02:24 - Page 06 02:57 - Page 07 03:32 - Page 08 03:57 - Page 09 04:26 - Page 10 04:57 - Page 11 05:16 - Page 12 05:51 - Page 13 06:20 - Page 14 06:52 - Page 15 07:26 - Page 16 07:58 - Page 17 08:26 - Page 18 09:02 - Page 19 09:34 - Page 20 10:03 - Page 21
Chapter 01. Home from School
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Blyton Enid_Mystery #03 - The Mystery of the Secret Room 00:07 - Page 01 00:30 - Page 02 01:00 - Page 03 01:39 - Page 04 02:08 - Page 05 02:30 - Page 06 03:04 - Page 07 03:42 - Page 08 04:11 - Page 09 04:37 - Page 10 05:03 - Page 11 05:32 - Page 12 06:08 - Page 13 06:36 - Page 14 07:13 - Page 15 07:52 - Page 16 08:20 - Page 17 08:53 - Page 18 09:22 - Page 19 09:57 - Page 20 10:23 - Page 21 10:5...
Chapter 13. Poirot Explains
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Agatha Christie - The Mysterious Affair at Styles
Chapter 12. The Last Link
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Agatha Christie - The Mysterious Affair at Styles
Chapter 11. The Case for the Prosecution
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Agatha Christie - The Mysterious Affair at Styles
Chapter 10. The Arrest
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Agatha Christie - The Mysterious Affair at Styles
Chapter 09. Dr. Bauerstein
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Agatha Christie - The Mysterious Affair at Styles
Chapter 08. Fresh Suspicions
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Agatha Christie - The Mysterious Affair at Styles
Chapter 07. Poirot Pays His Debts
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Chapter 07. Poirot Pays His Debts
Chapter 06. The Inquest
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Chapter 06. The Inquest
Chapter 05. “It isn’t strychnine, is it?”
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Chapter 05. “It isn’t strychnine, is it?”
Chapter 04. Poirot Investigates
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Chapter 04. Poirot Investigates
Chapter 03. The Night of the Tragedy
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Chapter 03. The Night of the Tragedy
Chapter 02. The 16th and 17th of July
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Chapter 02. The 16th and 17th of July
Chapter 01. I Go to Styles
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Chapter 01. I Go to Styles
Chapter 31
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Chapter 31
Chapter 30
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Chapter 30
Chapter 29
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Chapter 29
Chapter 28
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Chapter 28
Chapter 27
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Chapter 27
Chapter 26
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Chapter 26
Chapter 25
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Chapter 25
Chapter 24
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Chapter 24
Chapter 23
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Chapter 23
Chapter 22
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Chapter 22

КОМЕНТАРІ

  • @IluMshana-ni8xf
    @IluMshana-ni8xf 13 днів тому

    I love it

  • @IluMshana-ni8xf
    @IluMshana-ni8xf 13 днів тому

    Wonderful story

  • @viasha
    @viasha 22 дні тому

    Nice surprise to find such a lovely reader🎉 thank you

  • @AM-bf6fm
    @AM-bf6fm 2 місяці тому

    Very good 👍🏻

  • @untitles_locket6048
    @untitles_locket6048 3 місяці тому

    This whole book was ass

  • @gillianmac4987
    @gillianmac4987 3 місяці тому

    the accents are ok except the belgique one, i suggest you just do a normal accent, as it doesn't work, i prefer to others that have awful music in background or something

  • @hamburgerhelperofficial
    @hamburgerhelperofficial 3 місяці тому

    nettspenmddddddddd

  • @kathiestares6861
    @kathiestares6861 5 місяців тому

    Who's reading this book?

  • @annchristine47
    @annchristine47 5 місяців тому

    I have searched for ages,trying to find a narrator who would suit the story,only one and it was an American narrator ( not good)Having read everything Le Carre had ever written there have only been two people who have been first rate……..LeCarre,himself and Michael Jayston at reading LeCarre’s work. This narrator is good.

  • @nicholasachuz8329
    @nicholasachuz8329 5 місяців тому

    A legend 🙌recorded this video 12 years ago so we can benefit

  • @mustachcastach697
    @mustachcastach697 8 місяців тому

    this is the only video i can find that explains the jerk in a way i can understand it thank you

  • @constanciasmithhisler5100
    @constanciasmithhisler5100 9 місяців тому

    Promo-SM

  • @EdwardChan.999
    @EdwardChan.999 Рік тому

    Point taken. When trying to force a person, pushing is preferred over hitting.

  • @formarkcampbell
    @formarkcampbell Рік тому

    Love it like the voices 🦊🐺🐱🦌🦁🐈

  • @grivaldi8343
    @grivaldi8343 2 роки тому

    У меня логин не запрашивало ни разу , а при попытке сделать коммит пуш строчки с сообщением нет и просить ввести сообщение, что это может быть?

  • @xavier.antony
    @xavier.antony 2 роки тому

    Wow.. You lectures are so amazing and unique..

  • @yellowmoonishka1725
    @yellowmoonishka1725 2 роки тому

    спасибо

  • @kakandelawrence7473
    @kakandelawrence7473 2 роки тому

    I liked this lecture

  • @aashsyed1277
    @aashsyed1277 2 роки тому

    There should be a R times N in the center.

  • @enayahkhan6491
    @enayahkhan6491 2 роки тому

    👍👍👍👍👍

  • @lucachangretta1986
    @lucachangretta1986 3 роки тому

    когда указал какие файлы нужно добавить на гит, пишу логин и пароль и вылетает ошибка идентификации.

  • @SineSet
    @SineSet 3 роки тому

    Сейчас при попытке пуша постоянно требует логин/пароль, будто они введены неверно, при отмене пишет not authorized. Eclipse 2021-06 (4.20.0) Build id: 20210612-2011 Upd. Fix: в GitHub сгенерирйуте токен (Settings / Developer settings / Personal access tokens) хотя бы с правами "repo" и каким хотите сроком действия и вставляйте его вместо пароля. Всё работает.

    • @keeklool9627
      @keeklool9627 3 роки тому

      Спасибо огромное!

    • @Brokenssszzz
      @Brokenssszzz 3 роки тому

      огромнейшее спасибо!!! мне так бомбило)))

    • @НаташаГапоненко-ц7и
      @НаташаГапоненко-ц7и 2 роки тому

      все еще актуально!!!!!! спасибо огромное

    • @saburchik7111
      @saburchik7111 2 роки тому

      капец как я бомблю на eclipse, после бархатной легкости работы с гит в vscode. Спс, помогло

    • @sqrAnton
      @sqrAnton 2 роки тому

      Это получается кажды раз надо копировать этот токен? :D

  • @unknownvariablex7
    @unknownvariablex7 3 роки тому

    Come on man 2 minutes into the video and I feel like I know everything 👍

  • @nitrolionn
    @nitrolionn 3 роки тому

    Спасибо! выручил!!!!

  • @ЦехНастроения
    @ЦехНастроения 3 роки тому

    Спасибо большое, пол дня голову ломал, пока твое видео не нашел :)

  • @MrKlopina
    @MrKlopina 3 роки тому

    Спасибо

  • @ЛеонидЯ-н7э
    @ЛеонидЯ-н7э 3 роки тому

    Spasibo

  • @beautifulmath5361
    @beautifulmath5361 3 роки тому

    I created a computer simulation of this phenomenon.

  • @ВераКрылова-д9ъ
    @ВераКрылова-д9ъ 4 роки тому

    Спасибо Всё очень понятно.

  • @tk1-tk2-tk3
    @tk1-tk2-tk3 4 роки тому

    Complicated way of saying we care about changes in forces

    • @omgitsibrahim7712
      @omgitsibrahim7712 2 роки тому

      Lol

    • @ooffoo5130
      @ooffoo5130 2 роки тому

      Things like this necessarily must always seem overcomplicated because they eliminate our need for intuition which has the benefit of generalising to more abstract scenarios. Admittedly , it doesn't make it any less funny in the simple cases.

  • @Alwaysiamcaesar
    @Alwaysiamcaesar 4 роки тому

    Were they shooting from AK's in the audience? Great lecture, but I can barely hear it over the noise in the class...

  • @Evermed
    @Evermed 4 роки тому

    that is really cool how calculators work

  • @philopsyche
    @philopsyche 4 роки тому

    Gizmo

  • @1xxxtylerxxx1
    @1xxxtylerxxx1 4 роки тому

    Person in other room who hears tapping on the wall: "that's definitely a jerk next door."

  • @Evermed
    @Evermed 4 роки тому

    This is super cool.

  • @a1ang0r85
    @a1ang0r85 4 роки тому

    how can you find all these are orthogonal basis vector other than finding their inner product?

  • @Consistent_markets
    @Consistent_markets 4 роки тому

    bro.. what?

  • @joelabraham708
    @joelabraham708 4 роки тому

    P < 1 / f''(0) "when the point is closer than the inverse of the second derivative at zero" I've been exploding my brain trying to solve this - I haven't found anything online about it, and I can't even guess what name this critical point might have you're trying to find the "minimum distance" to the curve, from some point on the y-axis, so you need to minimize the 'distance function' - ok then, if: the curve is f(x) the point on the y-axis is (0, Py) and some closest point is (x, f(x)) then the distance to that point closest point is: D(x) = sqrt( x^2 + ( f(x) - Py)^2 ) the MINIMUM value for that is somewhere when D'(x) = 0 so let's find D'(x) D'(x) = x + (f(x) - Py) * f'(x) then solve it for zero, and you'll have your candidates -- you check which is the smallest value, and then ... oh WAIT - we don't actually care about any of that! all we care about is if ZERO is the closest answer - which it will be when the SECOND derivative of this distance function, evaluated at zero, has a positive slope - is that right? that is to say: D''(0) > 0 hmm - well, what IS the second derivative of the distance function D(x) ? D''(x) = 1 + (f(x) - Py) * f''(x) + f'(x)^2 we're positive that we want this to be greater than zero when evaluated at x equals zero 1 + ( f(0) - Py ) * f''(0) + f'(0)^2 > 0 we've also specifically positioned this curve to be symmetric about the y-axis, and to have its 'vertex' at the origin - so we already know that f(0) is zero, AND that the slope of the tangent to the curve at zero is ALSO zero - which means that f'(0) is zero aswell - substituting that, we reduce [1 + (0 - Py) * f''(0) + 0^2 > 0] to [1 - Py * f''(0) > 0] and rearrange it to tell us something about Py: Py < 1/f''(0) I created a desmos graph to check this out, and it _does_ werk for an ellipse or a parabola, but NOT for x^4 in certain cases, it's possible to have solutions that are closer than zero even if the slope of D'' is positive at zero I described the critical point a little more succinctly as: Py * f''(0) < 1 I ought to be able to figure out the second derivative of an ellipse in terms of the major and minor axes, and end up with a more geometric - instead of a calculine one - possibly doing implicit differentiation of ax^2 + by^2 = r^2

  • @VexGamingTV
    @VexGamingTV 4 роки тому

    Dismissing the fact that velocity is something that will never be a given. Which put into mathematics will break any equation. Then goes on and says what if I want it to crash and transfer that velocity over before it stops. If that happened then the energy given onward will lose strength overtime too and not change anything. With each "crash" the velocity will still be on a decline. Eventually coming to a stop and eventually breaking your equation. So dont dismiss physics because physics plays a huge role in that equation even working to begin with.

  • @KM-nx5sh
    @KM-nx5sh 5 років тому

    thanks so much this is fucking awesome, brilliant .

  • @Linaiz
    @Linaiz 5 років тому

    This needs more recognition, amazing lecture!!

  • @geez6666
    @geez6666 5 років тому

    I've always loved your lecture videos. Very different. Not tuned at doing meaningless calculations focused at techniques that do not yield insight or scale well as the student progress into more advanced content. Thank you

  • @sirius4459
    @sirius4459 5 років тому

    Спасибо большое!

  • @osmankhalil339
    @osmankhalil339 5 років тому

    mathematics is like magic ,u can go anywhere from ur current knowledge , but how they really found the gradient concept , using this approach or something else?

  • @osmankhalil339
    @osmankhalil339 5 років тому

    so now u started to talk about dot product , but this is the first time u mention it , and i wasn't not explained, that means this series of vids come after another series?

  • @osmankhalil339
    @osmankhalil339 5 років тому

    also if the ball is sliding it will stay straight line

  • @osmankhalil339
    @osmankhalil339 5 років тому

    now its clear why we need a vector to describe the line in space ..thanks

  • @osmankhalil339
    @osmankhalil339 5 років тому

    great

  • @minhokim8263
    @minhokim8263 6 років тому

    Thank you for the comprehensive explanation, but how do you prove L'hospital's rule in the case of infinite/infinite?