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Subido el 4 de agosto de 2022 por José G.

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This is NASA's Space Power Facility near Cleveland, Ohio, and it is the world's biggest vacuum 00:00:00
chamber. It's used to test spacecraft in the conditions of outer space, and it does that 00:00:11
by pumping out the 30 tonnes of air in this chamber until there are about 2g left. And 00:00:16
it's kind of got an eccentric construction, which is part of its history. It was built 00:00:26
in the 1960s as a nuclear test facility to test nuclear propulsion systems, and that 00:00:31
meant that they built it out of aluminium to make the radiation easier to deal with. 00:00:38
Aluminium is not the best thing, the strongest material to build a vacuum chamber out of. 00:00:43
So they built an outer concrete skin, which is part radiation shielding and part an external 00:00:49
pressure vessel, so that this thing can take the force that's present on the outside when 00:00:55
it's pumped out to the conditions of outer space. 00:01:01
Galileo's experiment was simple. He took a heavy object and a light one, and dropped 00:01:12
them at the same time to see which fell fastest. 00:01:18
In this case, the feathers fell to the ground at a slower rate than the bowling ball because 00:01:36
of air resistance. 00:01:41
It takes three hours to pump out the 800,000 cubic feet of air from the chamber. 00:02:12
We dropped two millitour in the last 30 minutes. 00:02:18
But once it's complete, there's a near perfect vacuum inside. 00:02:22
6104 manual, 10% open. Station one, go for drop. PCB 30-1, pressure set point at 240 00:02:26
psi. We are go for drop. 00:02:35
10, 9, 8, 7, 6, 5, 4, cameras on, 2, 1, release. 00:02:39
They came down exactly the same. 00:03:05
Wow. 00:03:27
Look, look, look. 00:03:28
Watch right there. 00:03:29
Look at how they hit right there. 00:03:30
Wow. 00:03:31
Exactly. 00:03:32
Back on the side. 00:03:33
Exactly the same. 00:03:34
Feathers don't move. 00:03:35
Nothing. 00:03:36
Look at that. 00:03:37
Look at that. 00:03:38
That's just brilliant. 00:03:39
Isaac Newton would say that the ball and the feather fall because there's a force pulling 00:03:46
them down, gravity. 00:03:51
But Einstein imagined the scene very differently. 00:03:54
The happiest thought of his life was this. 00:03:58
The reason the bowling ball and the feather fall together is because they're not falling. 00:04:02
They're standing still. 00:04:10
There is no force acting on them at all. 00:04:12
He reasoned that if you couldn't see the background, there'd be no way of knowing that the ball 00:04:21
and the feathers were being accelerated towards the earth. 00:04:26
So he concluded, they weren't. 00:04:32
Subido por:
José G.
Licencia:
Todos los derechos reservados
Visualizaciones:
94
Fecha:
4 de agosto de 2022 - 11:39
Visibilidad:
Público
Centro:
CPR INF-PRI-SEC VIRGEN DE LA SOLEDAD
Duración:
04′ 41″
Relación de aspecto:
1.78:1
Resolución:
640x360 píxeles
Tamaño:
12.66 MBytes

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