Physics of contraptions meant to go faster than light.
Audible: http://bit.ly/AudibleVe
My video about the problem with Facebook: http://bit.ly/PwFB

Special thanks to MinutePhysics for visual effects and Prof. Geraint Lewis for revisions to earlier drafts of this video.

Enya Lyrics

Gaeilge (Irish Gaelic)

"Athair Ar Neamh"

Athair ar neamh, Dia linn
Athair ar neamh, Dia liom
M'anam, mo chroi, mo ghloir
Moladh duit a Dhia

Fada an la, go samh
Fada an oiche, gan gruaim
Aoibhneas, athas, gra
Moladh duit a Dhia

Moraim thu, o la go la
Moraim thu, o oiche go hoiche

Athair ar neamh, Dia linn
Athair ar neamh, Dia liom
An ghealach, an ghriain, an ghaoth
Moladh duit a Dhia


[English Translation]


"Father in Heaven"

Father in Heaven, God bless us
Father in Heaven, God bless me
My soul, my heart, my glory
Praise be to you, oh God

Long is the peaceful day
Long is the night without gloom
Wonder, joy, love
Praise be to you, oh God

I praise you from day to day
I praise you night after night

Father in Heaven, God bless us
Father in Heaven, God bless me
The moon, the sun, the wind
Praise be to you, oh God

Writer(s): Roma Ryan, Eithne Ni Bhraonain, Nicky Ryan
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Very confusing title but
very good song :D

If you are the owner of the music and don't want this track to be on my channel, please contact me at hardcoresound1@gmail.com

Acrylic Ball: http://bit.ly/BBBacrylic
Ping-Pong Ball: http://bit.ly/BBBpingpong
Balanced: http://bit.ly/BBBbalanced

This problem has made the rounds on the internet but I felt it deserved a treatment like this.

Special thanks to Gary and the Department of Earth, Planetary and Space Sciences at UCLA, to the students for participating, to Ivy for helping me coordinate everything and to Raquel for filming.

Music by Kevin MacLeod, http://incompetech.com "Monkeys, Spinning Monkeys"

Answer video: https://www.youtube.com/watch?v=BickMFHAZR0
The longest vertical straw you can use is 10.3 m http://www.youtube.com/watch?v=HUmZrtiXDik
This is because the weight of water in the straw must be supported by the pressure difference at its two ends. At the bottom, the pressure is atmospheric, and at the top, the lowest pressure you can create is a perfect vacuum (pressure = 0). Atmospheric pressure can support a water column about 10m high - BUT with 0 pressure at the top, the water would start boiling. This is called cavitation and it obviously can't be happening in trees.
After I posted the straw video, I received a lot of questions about how trees could be taler than 10m. I assumed there was a simple answer because there are plenty of trees taller than that. But as I asked around and read articles about it, I couldn't really find an explanation I was happy with.

Maybe there is not a continuous water column inside the tree, so each section only lifts water a little ways? This could be but it seems to require a series of pump mechanisms, and how would you join this pump sections together? Perhaps capillary action is holding the water up? But the xylem tubes in a tree seem too wide (~50 um) for this effect to be significant. Maybe osmotic pressure could push the water from below rather than sucking it up from above? But some trees live in mangroves, where there is much higher solute concentration in the sea water than in their roots, so osmosis would work the other way.

Eventually I spoke to a plant biologist and sorted this all out, but I wanted to give you a little back to school challenge. How do you think this could work?

There is a common perception that weight and mass are basically the same thing. This video aims to tease out the difference between mass and weight by asking people what makes a car difficult to push. The standard answer is that it is difficult to push because it's heavy. But heaviness is a measure of weight, the gravitational pull of the Earth attracting the car to Earth's center. When the car is pushed on a flat road, the force of gravity does not oppose the motion. Instead the resistance felt is an indication of the car's mass which determines its inertia. Inertia is the property of matter that means it tends to resist acceleration - the greater the mass, the less the acceleration for a given amount of force.

Sound waves in a tube of gas create flames of different heights that dance to the music. A metal tube with holes in it is filled with gas. The gas is lit to create a row of tiny flames. A speaker at one end plays sound into the tube, which creates a standing wave of sound: areas where air molecules are vibrating rapidly separated by areas where the air is fairly still. This produces the different heights of flames and allows the wavelength of the sound wave to be estimated.

I used a nitrogen membrane and Stirling cryocooler to liquefy nitrogen out of the air. For this video I partnered with Starbucks to celebrate their Nitro Cold Brew. Order one here: https://starbucks.app.link/derekmuller

Making liquid nitrogen is hard - in fact up until 150 years ago scientists doubted whether it was even possible to liquefy nitrogen. In 1823, At the royal institution in London, Michael Faraday first produced liquid chlorine, kind of accidentally by putting it under high pressure. He similarly liquefied ammonia.

Borrowing a mixture from Thilorier in France, a combination of dry ice, snow and ether, he reached a temperature of -110C. By 1845 he used this mixture plus a hand pump to pressurize gases to liquefy all the known gases except six, which included oxygen and nitrogen. These became known as the “permanent” gases.

A French Physicist Aimé compressed oxygen and nitrogen in tanks and then lowered them into the ocean over 1.6km deep, where the pressure got up to 200 atmospheres. Still the gases didn’t liquefy.

Only at the end of 1877 were the first droplets of liquid oxygen and liquid nitrogen produced, by Cailletet in France. He first tried oxygen by compressing it up to 300 atmospheres, cooled to -30C, but that wasn't even enough to liquefy oxygen. But when he suddenly released the pressure, the expanding gas cooled, he estimated to -200C and he saw a mist and then droplets slide down the walls of his vessel.

It's amazing how far we've come in that now I can purchase a helium-based cryocooler. It compresses and expands the gas to absorb heat from the tip of the cold finger and eject it into the surroundings at ambient temperature.

As a Canadian-Australian, I have always wondered why it is that Australia has so many venomous animals that can kill you while Canada has virtually none.
Subscribe to Veritasium - it's free! http://bit.ly/YSWpWm


But it's not just Australia - it seems like all beautiful, warm places are cursed with venomous native species. So I set out to find the truth: why have all these venomous species evolved in the world's best holiday destinations?

I asked chemists, visited the zoo, interviewed entomologists and snake experts. The answer I found was complicated:
1. The majority of venomous species are ectotherms, cold-blooded creatures whose internal temperatures are governed by their surroundings.
2. This means they have limited periods of activity - mainly while it's warm out, and can only exert short bursts of energy, so they are generally "sit and wait" predators. This may explain why they, more than mammals or birds, evolved venom.
3. It also explains why there are more of these species in warm climates. There are more of all species in warm climates, but this trend is especially pronounced for ectotherms.
4. So there are a greater number of venomous species in warm places, simply because there are more species in warm places. Cold climates still have venomous creatures, like the rattlesnakes of Canada and European vipers.
5. But history also has a role to play. In Australia, there were no snakes until 20 million years ago when a venomous sea snake from Asia encountered the land, sending venomous species to all corners of the continent. Later non-venomous arrivals have done well in the tropics but not as well in Australia's colder climates, so venomous types still dominate there. Hawaii has no venomous land snakes and nor does Jamaica.
6. The recent ice age also would have driven ectotherms from the northern parts of the Northern Hemisphere. This is why there are no snakes in Ireland, for example.

Special thanks to Prof. Rick Shine, Prof. Dieter Hochuli, Prof. Roger Lowe, Prof. Martyn Poliakoff and Taronga Zoo, especially Joe Haddock and Dean Purcell.

Cinematography by Charles Clement

Strange flying objects have been caught on NASA’s cameras and astronauts have reported seeing UFOs. Some can be identified; others remain a mystery. We’ll reveal NASA footage and interview the astronauts and scientists.

Stream More Full Episodes of NASA's Unexplained Files:
https://www.sciencechannel.com..../tv-shows/nasas-unex

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Aboard the International Space Station, Expedition 62 Flight Engineer Jessica Meir of NASA discussed the revolutionary Zero-G oven recently used on the orbital outpost during an in-flight question and answer session Feb. 19 with students from the East Middle School in Grand Blanc, Michigan. The oven was launched on a Northrop Grumman Cygnus cargo ship last November, and, along with cookies baked in the oven, was returned to Earth in January on a SpaceX/Dragon resupply vehicle.

Join NASA Psyche Mission Co-Investigator Dr. Tim McCoy as he takes us on a journey from his first geology class to his current role as Curator-in-Charge of the US National Meteorite Collection at the Smithsonian National Museum of Natural History and his role on the Psyche Mission Science Team. Along the way, McCoy highlights the significance of studying a metallic asteroid and what it may be able to tell us about the formation of the solar system and our own planet. It’s the journey of a lifetime, and he didn’t want to miss it.


Psyche is both the name of an asteroid orbiting the Sun between Mars and Jupiter — and the name of a NASA space mission to visit that asteroid, led by Arizona State University.



For more information about NASA's Psyche mission go to:
http://www.nasa.gov/psyche

On Monday, Jan. 20 starting at 6:50 a.m. EST, NASA astronauts Jessica Meir and Christina Koch will step outside of the International Space Station into the vacuum of space together. The duo will wrap up the work of installing new lithium-ion batteries to upgrade the orbiting lab’s power systems. The spacewalk is scheduled to last about six-and-a-half hours.

musica cristiana de jesus adrian romero..tu estas aqui (iglesia adventista del septimo dia de cambio puente)

Descargalo en VastagoDigital: http://smarturl.it/z867sf
Descargalo en iTunes: http://itun.es/i6Jz7RC
Mas opciones de compra: http://smarturl.it/ijqr88
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Paginas Oficiales:
https://www.facebook.com/MarcelaGandaraOficial
https://twitter.com/Marcela_Gandara
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Siento una angustia en mi corazón...
una tristeza que no es normal
siento tan lejos tu amor Señor
dime adonde estas...
dime adonde estas...
a que hora Señor
no te puedo allar

(1) Reconozco Señor peque
y reconozco Señor falle
la oscuridad me a visto llorar
el silencio también
me ah oído a mi
escuchame Señor
y perdoname, perdoname

Coro:
Tal como soy
vengo hasta a ti
con la esperanza y también la fe
de que tu Señor me perdonaras
de que tu Señor me perdonaras

(1)
coro(x1)

2 Horas de Musica Cristiana Roberto Orellana,Oscar Medina,Rabito Sus Mejores Exitos

▂ ▃ ▄ ▅ ▆ ▇ █ SUSCRIBETE Y COMENTA █ ▇ ▆ ▅ ▄ ▃ ▂
SUBO VÍDEOS TODOS LOS MIÉRCOLES Y VIERNES ,ACTIVA LA CAMPANA PARA SABER CUANDO SUBO VIDEO ,SI ESTAS ACTIVO EN LOS COMENTARIOS ,SERAS SALUDADO EN EL PRÓXIMO VÍDEO

--------------------------------------------------------
LETRA:

Yo tengo un nuevo amor, el corazón me late sin parar, hay uno que
Me ha dicho te
Te amo de verdad, jesús mi amor y mas que amor mi dulce paz.
Yo tengo un nuevo amor jamas imagine poder hallar, aquel que le
Dio a mi vida
Una razón para amar, jesús mi amor y más que amor mi dulce paz.

Siento que tengo ganas de volar al firmamento, gritarle al mundo
Entero lo que
Estoy sintiendo, que ya encontré mi dulce amor, jesús es toda mi
Verdad, y nunca
Yo me cansare de repetir hasta el final.

Yo tengo un nuevo amor, el corazón me late sin parar, hay uno
Que me ha dicho te
Te amo de verdad, jesús mi amor y más que amor mi dulce paz.
Yo tengo un nuevo amor jamas imagine poder hallar, aquel que le
Dio a mi vida
Una razón para amar, jesús mi amor y más que amor mi dulce paz.

Amo su voz dulcísima en respuesta cuando llamo, sus ojos tiernos
Hasta el toque de
Sus manos, por siempre suyo quiero ser, jesús es toda mi verdad
Y nunca yo me
Cansare de repetir hasta el final.
--------------------------------------------
Le doy primero las gracias a Dios por verme dado estos talentos que quiero compartir con ustedes ,Espero que les guste y sea de bendición are lo posible para mejorar ,DIOS LES BENDIGA ,BIENVENIDOS A DAVID TUTORIALES
-----------------------------SUSCRIBETE Y COMPARTE-----------------------------
DAVID TUTORIALES

CANALES AMIGOS :VISITALOS

NANCY MORALES LONDOÑO;
https://www.youtube.com/channe....l/UCrG9AnINcmbuL1JVs

EDWIN TUTORIALES EN PIANO :
https://www.youtube.com/channe....l/UCk-fsZi7cxj1L2idi

Johan ValenciaD:
https://www.youtube.com/channe....l/UCRpzJG_CSqLm2VKcQ