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River Spirit · Aaron Wheeler

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Released on: 2005-05-18

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Перейдите на curiositystream.com/minutephysics, чтобы получить бесплатный месяц CuriosityStream вместе с Nebula!

Поддержите MinutePhysics на Patreon! www.patreon.com/minutephysics
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Это видео о том, почему слова переворачиваются в зеркале влево и вправо (горизонтально), но не вверх и вниз (вертикально). Ответ связан с зеркальным отражением, как будто зеркала это окна в другой мир (как альтернативные вселенные, вывернутые наизнанку!), и непрозрачностью того, на чем мы пишем.

ССЫЛКИ
Зеркальное отражение
ru.wikipedia.org/wiki/Отражение_(геометрия)

Видео PhysicsGirl про зеркала
www.youtube.com/watch?v=vBpxhfBlVLU

Принцип Ферма
electron6.phys.utk.edu/optics421/modules/m1/Fermats principle.htm

Объяснение Томаса–Ферми
en.wikipedia.org/wiki/Thomas–Fermi_screening

MinutePhysics в твиттере — @minutephysics
И Facebook — facebook.com/minutephysics
И Google (кто-то им еще пользуется?) — bit.ly/qzEwc6

Minute Physics рассказывает в игровой форме о старых и новых проблемах в физике – и всё это всего за одну минуту!

Создано Генри Райхом.

How is the chemical energy of gasoline transformed into kinetic energy of a moving car? And where does that kinetic energy go when the car crashes into something and stops moving?

Thanks to Ford (http://www.takeagoodlook.com) for sponsoring this video.

Link to Patreon supporters here: www.minutephysics.com/supporters.html

Music by Nathaniel Schroeder, www.soundcloud.com/drschroeder

MinutePhysics is on Google — bit.ly/qzEwc6
And facebook — facebook.com/minutephysics
And twitter — @minutephysics

Minute Physics provides an energetic and entertaining view of old and new problems in physics — all in a minute! Created by Henry Reich

Huge thanks to Jane Street! www.janestreet.com/join-jane-street/

Check out Ben Sparkss GeoGebra files.
Binet formula 2D complex output: www.geogebra.org/m/twvvzpga
3D imaginary output of Binet formula: www.geogebra.org/m/z6dy9cj5
3D plot of absolute output of Binet formula: www.geogebra.org/m/pb7hmxyd

My four-part series on Numberphile videos about Fibonacci Numbers (from 2014) starts here.
www.youtube.com/watch?v=D8ntDpBm6Ok

Here is me going on about the square root of five (Numberphile 2018).
www.youtube.com/watch?v=z1THaBtc5RE

This was the Fibonacci puzzle video from Matt Parkers Maths Puzzles.
www.youtube.com/watch?v=ILrqPpLpwpE

Read a whole bunch about «Generalized Fibonacci Sequences and Binet-Fibonacci Curves».
arxiv.org/pdf/1707.09151.pdf

The zero I found was at -9.14202391817 2.80064954276i and you can see the exact form here: www.wolframalpha.com/input/?i=(10*pi)/(pi + i*(log(sqrt(5) — 1) — log(1 + sqrt(5))))

Try it for yourself and put the Binet Formula (((1 sqrt(5))/2)^n — ((1-sqrt(5))/2)^n)/sqrt(5) in the Wolfram roots calculator: www.wolframalpha.com/widgets/view.jsp?id=b858339e64fa997454dd12f77cb1ece1

This site has everything youll ever need to know about Fibonacci Numbers.
www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/fibFormula.html

Buttercup — The original buttercupchallenge
www.youtube.com/watch?v=l17l_KTAVJ0

CORRECTIONS
This was a long video and in hindsight there are a few things I wish I had phrased better. Here they all are:
— I misspoke around 01:13 when I said «negative one, zero» as it is clearly «negative one, one, zero».
— At 07:53 I mean the negative values -5 to 0. I said it a weird way.
— My language at about the 1D input to 2D plot from 09:17 is a bit sloppy. The real values going into the Binet function are not the horizontal axis shown; the plot onscreen is solely the output.
— I say «axis» when I mean «plane» or even «complex plane». The big flat thing.
Let me know if you spot anything else!

Thanks again, as always, for Jane Street being my principal sponsor.
www.janestreet.com/

Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset:

Loren Thomas
Richard Dickins
Barry Salter
Susan Moury
Sarah Gerweck
Ulrich Kempken
Piotr
Gary Martin
Euler
Daniel DeJarnatt

Support my channel and I can make more videos:
www.patreon.com/standupmaths

Filming and editing by Matt Parker
Music by Howard Carter (excluding Buttercup)
Design by Simon Wright and Adam Robinson

MATT PARKER: Stand-up Mathematician
Website: standupmaths.com/
US book: www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/
UK book: mathsgear.co.uk/products/5b9fa76f230ffa140094dc43
Nerdy maths toys: mathsgear.co.uk/

Featuring Matt Parker, who also wrote a book: bit.ly/Matt_4D_US
More links

I talk to Hannah Fry and compare our mathematical investigations into playing Monopoly. I’ve put all my probabilities below.

You can buy a signed copy of Hannahs book on Maths Gear:
mathsgear.co.uk/collections/books/products/signed-copy-of-the-indisputable-existence-of-santa-claus

In the UK you can also get it from Waterstones:
www.waterstones.com/book/the-indisputable-existence-of-santa-claus/dr-hannah-fry/dr-hannah-fry/9780857524607

There is a Kindle edition on Amazon:
www.amazon.com/Indisputable-Existence-Santa-Claus-ebook/dp/B01G96DPWS?_encoding=UTF8

Gravity Industries make jetpacks. Theyre not practical. Theyre not meant for mass use. But they are a lot of fun. They asked if I wanted to try flying one. Thanks to gravity.co/ — this is not sponsored but, obviously, they did give me a flight in a jetpack.

Gravitys YouTube channel: www.youtube.com/channel/UCkHr2Z0JWH8KGmQNDp4QXLw
Pilot Sam landing on my hand: www.youtube.com/watch?v=-Ch2vHah_Os

Filmed safely: www.tomscott.com/safe/

Camera by Simon Temple templefreelance.co.uk/
Edited by Michelle Martin @mrsmmartin
Audio mix by Graham Haerther

Im at tomscott.com

on Twitter at twitter.com/tomscott

on Facebook at facebook.com/tomscott

and on Instagram as tomscottgo

Урок физики в Ришельевском лицее

Нью-Йорк вложил 15 млрд. долларов в перестройку системы общественного транспорта. Это один из самых важных общественных проектов в истории мегаполиса. Прокладка 2-х новых линий метро и расширение самого большого вокзала на Земле — путем взрыва его основания.
Подробности грандиозных и дерзких проектов смотрите в шоу «Гигантские стройки» на канале Discovery!

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