Michael Faraday – The Man Behind the Electric Generator
In 1831, Michael Faraday discovered electromagnetic induction: changing magnetic flux through a coil induces voltage.
This discovery laid the foundation for modern electric generators and transformers.
Nadie me va a bajar de este barco, yo pienso que rajaron a James Gunn de DC Studios por meterse con Israel en la peli de Superman, y teniendo en cuenta que los que controlan Paramount (nuevo dueño de Warner) son sionistas...
"So, this everything you were hoping for?"
"It's got its ups and downs, but... you can't deny the view though."
Just some giraffe ambiance in The Last of Us Part I to start your day off right. 🦒
Hermano que bien se siente tener ambos juegos y no pelearse por cuál es el mejor, lo importante es que los gamers comeremos extraordinariamente bien este mes!
The right hand is the master key that locks every rotation in space to one consistent direction.
Place your right thumb along any axis. The curl of your fingers now traces the only positive spin that axis will ever know. Blue marks +x, red +y, green +z. Each matching ring shows exactly that curl.
This single convention forces x × y to land on z. Flight computers, robot arms, and spacecraft all inherit the identical signs so a positive pitch never flips the vehicle upside down.
One hand, three axes, and the geometry of turning becomes unambiguous.
The Fourier Transform: One Signal, Two Pictures
The same signal seen two ways. On the left wall, time: the coral curve is a square wave built from sine waves,
f(t) = (4/pi) times the sum of sin((2k-1)t)/(2k-1), for k = 1, 2, 3, ...
Each new sine slides out of the sum into its own place, and the corner of the square sharpens with every one (the little overshoot that never goes away is the Gibbs phenomenon).
On the right wall, frequency: each sine leaves a single spike at its frequency 1, 3, 5, 7, ... with height 4/(pi(2k-1)). That row of spikes is the Fourier transform of the square wave, f-hat(xi) = integral of f(x) e^(-2 pi i xi x) dx.
Turn to face the time wall and you see the square wave. Turn to face the frequency wall and you see its recipe. The sound is the same build: each harmonic joins at 110 Hz times 1, 3, 5, ... until you hear a square wave.
Richard Feynman lied to a librarian to borrow a calculus book. He was only about 13 years old.
In the early 1930s, trigonometry was the highest mathematics course offered at Far Rockaway High School in New York. But Feynman wanted to learn calculus, so he turned to a book by J. E. Thompson called Calculus for the Practical Man.
When he tried to borrow it, the librarian questioned why a child wanted such a book. Feynman told her it was for his father.
He took it home and taught himself calculus.
What makes this story remarkable is that his original notebook still exists.
Preserved at the Niels Bohr Library & Archives, the small green notebook contains handwritten explanations, carefully copied diagrams, formulas, and an index he created himself. His notes cover the entire book.
There was also a moment he never forgot.
When his father tried reading the book, he struggled to understand the opening material. Feynman later recalled:
"It was the first time I realized that I could understand what he couldn't understand."
That teenager went on to study at MIT, pursue graduate research at Princeton, work on the Manhattan Project at Los Alamos, and share the 1965 Nobel Prize in Physics for his contributions to quantum electrodynamics.
He also developed his own mathematical notation while young, experimenting with different ways of expressing familiar functions.
Decades later, his lectures and diagrams would help generations of physicists understand difficult ideas.
The book in this photograph is the 1946 second edition. Feynman learned from an earlier edition published in the 1930s.
His surviving notebook is a remarkable reminder of what independent study can look like. He didn't simply collect formulas. He worked through the mathematics carefully enough to make it his own.
@Zet_Ad96@elgranqenk La gente compra ps5 por sus exclusivos lo que pasa es que Playstation tiene juegos muy diversos, unos lo compran por TLOUS otros por Gt7 otros por Horizon y así . Mientras tanto los que compran Nintendo es para jugar Mario o Zelda si o si. 👍
@Mambynn Él secreto para llevarla tranquila es que tu grupo de amigos se apoyen, no esperar aprender todo en las clases el 80% es estudiar por tu cuenta y no tener miedo de preguntar, si te apasiona las matemáticas ya llevas ventaja. Si son muy difíciles pero nada con lo que no puedas 😊
@El_inquietudes Que tipo tan nefasto, naco, sin higiene, inmaduro, ignorante, fracasado, ridículo, sin modales ni clase encerio, un pobre diablo así creé que puede dar lecciones a los demás 🤦🤦🤦