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Author Topic: dolphins are sooooo clever  (Read 3395 times)

Offline ukmicky

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dolphins are sooooo clever
« on: 12/03/2009 18:46:11 »
How do these amazing dolphins control these rings, why dont they simply go up


 

Offline DoctorBeaver

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dolphins are sooooo clever
« Reply #1 on: 12/03/2009 20:42:17 »
If they're so clever how come they haven't learned not to follow tuna?
 

Offline ukmicky

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dolphins are sooooo clever
« Reply #2 on: 12/03/2009 23:10:17 »
If you release a bubble of air into water it travels up,how is it that there rings of air dont  travel up.

P.S I didnt say they were clever

 

Offline RD

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dolphins are sooooo clever
« Reply #3 on: 13/03/2009 01:09:09 »
The ring is a toroidal vortex (like a smoke ring): a doughnut of water is rotating around the air, trapping it.

The force created by the momentum of the rotating doughnut of water surrounding the air ring is greater than the buoyancy force of the air, so the air ring does not rise. 
« Last Edit: 13/03/2009 01:22:38 by RD »
 

Offline DoctorBeaver

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dolphins are sooooo clever
« Reply #4 on: 13/03/2009 05:01:13 »
Excellent vid by the way
 

Offline neilep

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dolphins are sooooo clever
« Reply #5 on: 13/03/2009 12:01:41 »
I love the video, and thanks for asking the question I was going to ask Michael..and thanks for answering it RD
 

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dolphins are sooooo clever
« Reply #5 on: 13/03/2009 12:01:41 »

 

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