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Hurricane Energy And Coriolis Effect

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment demonstrating the power of hurricanes and how the Coriolis Effect works.

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Dr. D said he was going to meet us here at Mosey. 00:00:00
Look, there he is, riding a bicycle on a tightrope. 00:00:06
How is he doing that? 00:00:10
Hey, Dr. D, how do you keep from falling? 00:00:12
The laws of physics make it impossible for me to fall. 00:00:15
The huge counterweight below makes all the difference. 00:00:18
Are you sure you can trust those laws all the time? 00:00:22
Don't worry about me. 00:00:24
I'll meet you in the hurricane room as soon as I get off the bicycle. 00:00:26
I've never been in a hurricane before. 00:00:39
Are you sure this is safe? 00:00:41
Of course it's safe. 00:00:43
In here, we'll feel one of the most tremendous forces of nature. 00:00:45
It will only be a minimal hurricane, but at 74 miles per hour, 00:00:48
it will still be quite an experience. 00:00:51
Here we go. 00:00:53
Wow, that was really amazing. 00:00:56
Are you sure that was just a minimal hurricane? 00:01:10
You bet. 00:01:13
Now, it's estimated that a really major hurricane with 148 mile-an-hour winds, 00:01:14
or twice what you just experienced, 00:01:19
can produce 250 times the property damage of a minimal hurricane. 00:01:21
Wow, that's a lot of energy. 00:01:25
Dr. Lyons told us the sun evaporates water and provides energy for the hurricane. 00:01:27
Yes, and the energy is given to the hurricane 00:01:32
when the evaporated water condenses into raindrops. 00:01:34
It turns out, if you condense just one liter of water, 00:01:36
it will give up enough energy to power a 60-watt light bulb for 11 hours. 00:01:40
But an average hurricane will condense 20 trillion liters of water in a day, 00:01:45
to 20 followed by 12 zeros. 00:01:50
Wow, that's way too big a number for me to comprehend. 00:01:53
That's as much energy as all the world's electrical generating plants produce in 200 days. 00:01:56
Wow, now I'm really impressed. 00:02:02
Hurricanes have a lot of energy. 00:02:04
Let me show you something else about hurricanes that's pretty interesting. 00:02:06
It turns out that hurricanes in the northern hemisphere all have a counterclockwise rotation. 00:02:10
All of them? 00:02:14
That's right. 00:02:15
It's because the hurricane is a low-pressure region. 00:02:16
When the air in the higher-pressure region around it rushes in, 00:02:19
it gets bent to the right because of the rotation of the earth. 00:02:21
This causes the counterclockwise rotation of the hurricane. 00:02:24
I don't get it. 00:02:27
How would the rotation of the earth make any difference? 00:02:28
We just happen to have a very interesting device here at the museum 00:02:31
that will help us understand how it works. 00:02:33
Let's have each of you sit on opposite ends of the board, and I'll give you a spin. 00:02:35
Hope you don't get too dizzy. 00:02:39
Now, Bianca, toss the ball over to Catherine. 00:02:45
It didn't even come close. 00:02:49
Try it again. 00:02:52
It curved to the right after I threw it. 00:02:57
The ball appeared to curve for the same reasons the winds are bent to the right 00:03:00
when they rush in toward the center of a hurricane. 00:03:03
It's called the Coriolis effect, and it exists in any rotating system. 00:03:05
I see the ball traveling in a straight line, 00:03:09
but as you see it on the rotating board, it really is curving. 00:03:11
Wow, this is so much fun. 00:03:14
I could sit on this all day. 00:03:16
Not me. I'm getting dizzy. 00:03:18
I need to get off this thing. 00:03:20
If you like conducting experiments, 00:03:22
you need to check out Dr. D's lab on the NASA Wi-Fi's website. 00:03:24
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Idioma/s:
en
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
189
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
03′ 28″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
20.87 MBytes

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