Top Vídeos

Veritasium
2 vistas · 5 años hace

Microwave grape plasma: http://www.youtube.com/watch?v=RwTjsRt0Fzo
Northern Lights: http://www.youtube.com/watch?v=knwiWm4DpvQ
Nanodiamonds in candle flames: http://www.youtube.com/watch?v=KzOkuGQC3Rw
Relight Candle Trick: http://www.youtube.com/watch?v=1tXPVTIisl0

Is a flame really a plasma? Well it depends on your definition of plasma, but there are certainly ions in a flame, formed as molecules collide with each other at high speed, sometimes knocking electrons off of their atoms.

Special thanks to the Palais de la Decouverte for helping me perform this experiment. Using tens of thousands of volts on two metal plates, we created a strong electric field around the plasma. This pulled positive ions in one direction and negative ions in the other direction elongating the flame horizontally and causing it to flicker like a "papillon" (butterfly). Then we showed that much longer sparks can be made through the flame than through air since the ions increase the conductivity.

Veritasium
2 vistas · 5 años hace

NOTE: This video will appear in a playlist on Smarter Every Day hence the references to Veritasium. Destin does lots of cool science stuff - check out his channel if you haven't already http://www.youtube.com/destinws2

We have been collaborating on rotational motion, which is timely for some of the videos I've been doing lately. In this video I talk about gyroscopic precession - the "wobbling" of a spinning top around its axis.

This is caused by the torque due to the object's weight. The big idea is that the torque vector increases angular momentum in the direction of torque. So if there is no angular momentum initially, it will cause the system to swing in such a direction that it is rotating with new angular momentum in the direction of the torque. However, if there was angular momentum to begin with, the torque will change the direction of that angular momentum by causing precession.

Veritasium
2 vistas · 5 años hace

Los mecanismos flexibles tienen muchas ventajas sobre los dispositivos tradicionales.
Visité el Compliant Mechanisms Research group en la Universidad Brigham Young y hablé con el profesor Larry Howell:
https://www.compliantmechanisms.byu.edu

En el enlace anterior, pueden descargar archivos de impresión en 3D para hacer algunos de los objetos en el video, además de aprender más sobre los mecanismos flexibles.

Lo que aprendí sobre los mecanismos conformes lo resumo en las 8 P de los mecanismos flexibles:

1. Recuento de Piezas (reducido por tener partes flexibles en lugar de resortes, bisagras)
2. Procesos de producción (muchos, nuevos, diferentes habilitados por diseños flexibles)
3. Precio (reducido por tener menos partes y diferentes procesos de producción)
4. Movimiento Preciso (sin holguras, menos desgaste, fricción)
5. Performance (no requiere lubricante)
6. Proporciones (reducidas a través de diferentes procesos de producción).
7. Portabilidad (ligero debido a diseños con piezas más simples y reducidas)
8. Previsibilidad (los dispositivos son confiables durante un largo período de tiempo)

Animación de Alan Chamberlain

user42
2 vistas · 5 años hace

A close look on one of the best bands of the 80's new wave / alternative music era.

TFF (as they were known) scored a string of hit singles, including “Everybody Wants To Rule The World,” “Shout,” “Sowing The Seeds Of Love” and “Pale Shelter,” in the 1980s.

Tears For Fears is composed of Curt Smith and Roland Orzabal from Bath Somerset, England.

Tears for Fears have sold over 30 million albums worldwide.

user41
2 vistas · 5 años hace

曲目:1知 2流 3万华镜 4绿洲 5阳 6无限水 7树 8空和云

user41
2 vistas · 5 años hace

All materials presented on this channel are copyrighted by their respective copyright owners, and are subject to use for Informational purposes only! Support the musicians, buy their music!

Veritasium
2 vistas · 5 años hace

Key aspects of pyramid construction from quarry to completion.
Check out Audible: http://bit.ly/AudibleVe
Live show in Alabama: http://bit.ly/VeRAOI

The most common misconception about the pyramids is that they were built by slaves. Recent archeological evidence suggests they were instead constructed by paid workers. Some may have performed this work as a form of tax payment for several months of the year. Skilled engineers would have planned and orchestrated the building. An estimated 10,000-20,000 people would have been working on a pyramid at any one point in time. They were well fed and provided with shelter near the pyramids. Plus their burial sites close by indicate they were respected and were not slaves.

Much of the limestone was quarried from the Giza plateau itself, meaning the stones did not need to be transported far. The granite casing of Menkaure's pyramid, on the other hand, was transported from Aswan, around 600 miles, or 1000 km up the Nile.

Editing assistance by Dustin Chow

Music by Kevin MacLeod, Incompetech.com "Desert City" and "Ibn Al-Noor"

Veritasium
2 vistas · 5 años hace

The Earth is clearly old, but exactly how old was difficult to work out. People long believed the Earth had only existed for several thousand years. Then, in the 1800's, a study of geological features (including fjords) led scientists to the conclusion that the planet must be much older - at least millions of years old. Later, the discovery of radioactivity provided a mechanism by which the Earth's core could be continually heated. This meant it was much older than previous estimates of 20-40 million years based on the cooling rate of the Earth. Today through many different methods we have established that the Earth is roughly 4.54 billion years old!

Veritasium
2 vistas · 5 años hace

What is radiation? Are all types harmful? What are the most common sources of damaging radiation? Most people view radiation as harmful and negative without understanding what makes it potentially damaging and which forms should be avoided. For example, many felt radiation from mobile phones probably caused cancer but few focused on the carcinogenic effects of UV rays.

Veritasium
2 vistas · 5 años hace

Starring: Christie Wykes as Chlorine, Carbon, and Sodium
Director of Photography: Sean McCallum
Gravity (John Mayer Cover) http://www.youtube.com/watch?v=u7KpH9_I2Dw
I'm Atoms (Jason Mraz Cover) http://www.youtube.com/watch?v=DBjZz0iQrzI
Electricity (Jet Cover) http://www.youtube.com/watch?v=cY-kiddvAg0
Experiments A Cappella http://www.youtube.com/watch?v=lRbI_vPyOnc

user40
2 vistas · 5 años hace

Letra de Sólo Tu Gracia, de Daniel Calveti


(Señor, estamos agradecidos por tu gracia,
porque tu gracia nos ha arropado,
nos tiene aquí hoy, te amamos Señor.

Solo tu amor nos ha sostenido,
y hoy podemos cantar de tu tierna gracia,
te amamos a ti Señor.)

Solo tu gracia es la que abre puertas
Solo tu amor es quien me sostiene
Y yo no entiendo.

Porque me escogiste habiendo muchos aquí
No se lo que pasa pero gracias te doy
Porque en tu mirada me viste tu a mi
Y habiendo otros que hagan lo mismo
Me escogiste a mí.

Solo tú abres puertas que yo no entiendo, no.
Y si otros me preguntan porque estoy aquí
Yo les contestaré:

No es por mis fuerzas,
No es por lo que sé hacer
No es por lo que tengo
Es por tu tierna gracia
Tu tierna gracia
Tu tierna gracia
Y nada más

(Si Dios te ha dado algo, no es por tus fuerzas
solo es su gracia
no importa en que posición estés
no importa todos los bienes que puedas tener
es su gracia que te ha llevado allí.
Solo hay que tener un corazón agradecido
y decir: Señor, es tu gracia,
es tu gracia que nos sostiene.)

No, no es por mis fuerzas,
No es por lo que sé hacer
No es por lo que tengo
Es por tu tierna gracia
Tu tierna gracia
Tu tierna gracia
Y nada más. Haz click para suscribirte: http://bit.ly/DanielCalvetiOficial

user40
2 vistas · 5 años hace

Conoce más en un minuto aquí del Nuevo CD "Habla Sobre Mí" a salir este 30 de Agosto. @danielcalvetipr
Suscríbete: http://bit.ly/DanielCalvetiOficial
Para que también ese día puedas ver el nuevo vídeo del primer sencillo.
¡Dios te bendiga!
#TourHablaSobreMí

user40
2 vistas · 5 años hace

Una canción interpretada por mi, espero les guste , bendiciones...!!!!

user40
2 vistas · 5 años hace

La Niña de tus ojos
"te amo mas que a mi vida"

user40
2 vistas · 5 años hace

EL AMOR DE DIOS

user40
2 vistas · 5 años hace

#micancioncristianaconletra #tuestasaqui #jesusadrianromero

user40
2 vistas · 5 años hace

Levanto mis manos
aunque no tenga fuerzas.
Levanto mis manos
aunque tenga mil problemas.

Coro:
Cuando levanto mis manos
comienzo a sentir
una unción que me hace cantar.

Cuando levanto mis manos
comienzo a sentir
el fuego.

Cuando levanto mis manos
mis cargas se van,
nuevas fuerzas Tú me das.
Todo eso es posible, todo eso es posible,
cuando levanto mis manos.




Showing 783 out of 809