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Alexander Brodsky
Приєднався 1 тра 2011
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?
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?
Переглядів: 33
Відео
Lecture 2. The Relation of Mathematics and Physics
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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...
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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...
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I love it
Wonderful story
Nice surprise to find such a lovely reader🎉 thank you
Very good 👍🏻
This whole book was ass
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
nettspenmddddddddd
Who's reading this book?
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.
A legend 🙌recorded this video 12 years ago so we can benefit
this is the only video i can find that explains the jerk in a way i can understand it thank you
Promo-SM
Point taken. When trying to force a person, pushing is preferred over hitting.
Love it like the voices 🦊🐺🐱🦌🦁🐈
Soooo funny 🎉😂😊🎉😂❤
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?
Wow.. You lectures are so amazing and unique..
спасибо
I liked this lecture
There should be a R times N in the center.
👍👍👍👍👍
когда указал какие файлы нужно добавить на гит, пишу логин и пароль и вылетает ошибка идентификации.
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.
Спасибо огромное!
огромнейшее спасибо!!! мне так бомбило)))
все еще актуально!!!!!! спасибо огромное
капец как я бомблю на eclipse, после бархатной легкости работы с гит в vscode. Спс, помогло
Это получается кажды раз надо копировать этот токен? :D
Come on man 2 minutes into the video and I feel like I know everything 👍
Спасибо! выручил!!!!
Спасибо большое, пол дня голову ломал, пока твое видео не нашел :)
Спасибо
Spasibo
I created a computer simulation of this phenomenon.
Спасибо Всё очень понятно.
Complicated way of saying we care about changes in forces
Lol
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.
Were they shooting from AK's in the audience? Great lecture, but I can barely hear it over the noise in the class...
that is really cool how calculators work
Gizmo
Person in other room who hears tapping on the wall: "that's definitely a jerk next door."
This is super cool.
how can you find all these are orthogonal basis vector other than finding their inner product?
bro.. what?
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
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.
thanks so much this is fucking awesome, brilliant .
This needs more recognition, amazing lecture!!
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
Спасибо большое!
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?
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?
also if the ball is sliding it will stay straight line
now its clear why we need a vector to describe the line in space ..thanks
great
Thank you for the comprehensive explanation, but how do you prove L'hospital's rule in the case of infinite/infinite?