HoldMyTypeMar 15

Can someone explain reverse swing? Does the batsman actually watch the ball before the bowler bowls and expect it to swing in one direction? : r/Cricket
#bernoulli's principle in layman's terms

You must have seen players polishing the ball. They usually polish one side repeatedly. So, you will have a ball with smooth surface on one side and not so smooth on the other side. Now if you bowl with the seam in vertical middle, physics suggests the smoother side will have less friction, so the ball will move in the direction of the smoother side. When a batsman sees this (they can, that's why they have a sight screen behind the bowler), he/she expects the ball to move in the direction of the smoother side, but when it does the opposite, that's called reverse swinging. Now over to somebody that explain the physics of reverse swinging!
https://en.wikipedia.org/wiki/Bernoulli%27s_principle

Bernoulli's principle - Wikipedia

David GraylessMar 11
#LucioRusso (22 November 1944 – 12 July 2025) was an Italian physicist, mathematician and historian of science. Born in #Venice, he taught at the Mathematics Department of the #UniversityOfRomeTorVergata. He died in Bologna on 12 July 2025, at the age of 80. Among his main areas of interest were #GibbsMeasure of the #IsingModel, #percolationTheory, and finite #Bernoulli schemes, within which he proved an approximate version of the classical #KolmogorovsZerooneLaw. In the history of science.
Show threadAlan J. CainFeb 18

Johann Bernoulli (= Jean; 1667–1748) posed the problem of finding the ‘brachistochrone’: the curve between two points along which a body starting from rest at the higher point and freely accelerated by uniform gravity would descend in minimum time to the lower.

Gottfried Wilhelm Leibniz (1646–1716) thought the problem beautiful; so did Guillaume de l’Hospital (1661–1704).

Bernoulli (and others) proved that the brachistochrone was again an inverted cycloid. He thought that the equality of the cycloid, tautochrone, and brachistochrone curve would leave his readers ‘petrified with astonishment’, and thought that it suggested some deep design in nature.

One of Bernoulli's proofs was what he considered a ‘very beautiful’ geometric demonstration that the cycloid was the brachistochrone.

But he did not publish it until 20 years later. Why? Apparently in part due to Leibniz, who had thought it so beautiful and extraordinary that he counselled against publication, with the aim of ‘so frustrating those who are not very grateful and who are accustomed to profiting from the inventions of others’.

**Here, mathematical beauty contributed to the suppression, albeit temporary, of mathematical knowledge.**

2/3

#Bernoulli #JohannBernoulli #JeanBernoulli #brachistochrone #Leibniz

Solo ingenieríaFeb 4

🌊 La mecánica de fluidos estudia cómo se comportan líquidos y gases. Desde aviones hasta tuberías, sus principios están en todo. ¡Descubre sus fundamentos! 💡

Lee más 👉 https://www.soloingenieria.org/ingenieria-mecanica/mecanica-de-fluidos/

Imagen creada con IA.
#MecánicaDeFluidos #IngenieríaMecánica #Hidráulica #Hidrodinámica #Bernoulli #Ingeniería

Solo ingenieríaFeb 4

Sin mecánica de fluidos no existirían aviones, sistemas de riego ni equipos médicos. Lo que parece teoría abstracta sostiene gran parte del mundo moderno. 🌊

#MecánicaDeFluidos #IngenieríaMecánica #Hidráulica #Hidrodinámica #Bernoulli #Ingeniería

Christian GudrianNov 5

Die #Bernoulli-Gleichung für Flüssigkeits-#Strömungen in offenen Gerinnen (z.B. Bachläufe) hat im allgemeinen Fall zwei energetisch gleichwertige Lösungen: eine, bei der die Flüssigkeit (z.B. Wasser) mit höherer Geschwindigkeit aber geringerem Pegel fließt ("schießen") und eine, bei der der Pegel höher ist, dafür die Geschwindigkeit geringer ("strömen").

Der Übergang vom Schießen zum Strömen kann spontan erfolgen, was sich durch einen sprunghaften Anstieg des Pegels ("Wechselsprung") bemerkbar macht.

Die Geschwindigkeit bei schießender Strömung liegt oberhalb der Wellen-Ausbreitungsgeschwindigkeit, beim Strömen entsprechend darunter. Der Wechselsprung ist somit mit dem #Verdichtungsstoß bei Überschallströmungen von Gasen vergleichbar.

https://de.wikipedia.org/wiki/Wechselsprung

Wechselsprung – Wikipedia

G3rn0tiOct 18
Look what I found on a regional flea market. #iomega #bernoulli #vintagecomputing #retrocomputing
Rémi EismannJul 14, 2025

One day, one decomposition
A000928: Irregular primes: primes p such that at least one of the numerators of the Bernoulli numbers B_2, B_4, ..., B_{p-3} (A000367) is divisible by p

3D graph, threejs - webGL ➡️ https://decompwlj.com/3Dgraph/Irregular_primes.html
3D graph Gen, threejs animation ➡️ https://decompwlj.com/3DgraphGen/Irregular_primes.html
2D graph, first 500 terms ➡️ https://decompwlj.com/2Dgraph500terms/Irregular_primes.html

#decompwlj #math #mathematics #sequence #OEIS #javascript #php #3D #Bernoulli #numbers #irregular #primes #PrimeNumbers #graph #threejs #webGL

Rémi EismannMay 9, 2025

One day, one decomposition
A249134: Numbers k such that Bernoulli number B_k has denominator 2730

3D graph, threejs - webGL ➡️ https://decompwlj.com/3Dgraph/A249134.html
2D graph, first 500 terms ➡️ https://decompwlj.com/2Dgraph500terms/A249134.html

#decompwlj #math #mathematics #sequence #OEIS #javascript #php #3D #Bernoulli #numbers #denominator #graph #threejs #webGL

Decomposition into weight × level + jump of A249134 in 3D - three.js webGL - Rémi Eismann

Decomposition into weight × level + jump of A249134 in 3D. Made with three.js webGL. Rémi Eismann

derSammlerMar 6, 2025

I'll probably never own a drive to read those, but these are some very impressive floppy disk cartridges. Also, 20 megs in 1984 - that's more than a typical hard disk had at that time. 😲

#IOMEGA #Bernoulli #RetroComputing #ObsoleteMedia