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Author Erm
xa0s
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4th Oct 11 at 11:17   View User's Profile U2U Member Reply With Quote
I saw this on a troll physics I think but it made me curious...

You know when you have a glass of water and a straw, you push the straw to the bottom and put your thumb over the top which holds the water in the straw when you lift it out.

Could this be done on a much bigger level? Like dipping a 5m wide straw into the sea and doing the same thing (blocking the end off)? I presume so, so is there anything stopping you from then being lifted up into the end of the massive straw so you can swim into it, go to the top, then swim back down and come out the bottom in which point gravity would take over and you would fall to the ground? Or imagine if the straw was turned upside down so you had to swim UPWARDS to fall DOWN.

Would this be possible?

Maybe the weight of the water would make it just fall out so lets imagine it was only 1m wide but like 100m long. Surely that's enough pressure to hold the water in and still be wide enough to swim in?
spencer88
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4th Oct 11 at 11:18   View User's Profile U2U Member Reply With Quote
xa0s
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4th Oct 11 at 11:19   View User's Profile U2U Member Reply With Quote
spencer88
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xa0s
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spencer88
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4th Oct 11 at 11:24   View User's Profile U2U Member Reply With Quote
3CorsaMeal
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4th Oct 11 at 11:27   View User's Profile U2U Member Reply With Quote
i do it all the time, Its great fun
DannyB
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4th Oct 11 at 12:17   View Garage View User's Profile U2U Member Reply With Quote
Nath
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4th Oct 11 at 12:21   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by DannyB
http://www.trollscientist.com/image/120-floating-swimming-pool-troll-physics.png


FlaFFy_91
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4th Oct 11 at 12:23   View Garage View User's Profile U2U Member Reply With Quote
From a physics point of view. Yes it would work. The pressure from outside creates a vaccume meaning the water will stay in. The bigger the tube it will have more water in it but it will also have more air capacity. So will still work the same
LeeM
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4th Oct 11 at 14:04   View User's Profile U2U Member Reply With Quote
there wouldnt be enough surface tension to hold the weight of that much water.
Gary
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4th Oct 11 at 14:10   View Garage View User's Profile U2U Member Reply With Quote
Plus i think you swimming in it would disturb the whole thing too.
jonny-sport
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4th Oct 11 at 14:11   View User's Profile U2U Member Reply With Quote
i think certain oil rigs use something along them lines to stay in place in the ocean but dipped in to the sand not water.
Steve
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4th Oct 11 at 14:17   View Garage View User's Profile U2U Member Reply With Quote
Simple physics. Surface tension over a small area (the diameter of a plain drinking straw) is quite high, enough to keep liquids from spilling out. Too large of an area and the liquid will fall out. Put a cup in a sink filled with water, let the water fill it completely, invert it, then lift it out bottom first. Splash, it all falls out.
John
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4th Oct 11 at 14:25   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by FlaFFy_91
From a physics point of view. Yes it would work. The pressure from outside creates a vaccume meaning the water will stay in. The bigger the tube it will have more water in it but it will also have more air capacity. So will still work the same


LeeM
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4th Oct 11 at 14:26   View User's Profile U2U Member Reply With Quote
ive done it with a glass, it can be done if youre very careful but thats probably the limit
Gary
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4th Oct 11 at 14:28   View Garage View User's Profile U2U Member Reply With Quote
To swin in it you'd need at least 2m dia tube.

A straw is about 6mm dia by 150mm long.

So youd need a tube 49.9m long by my calculations. Sounds about right imo.

Someone go try it
JonnyJ
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4th Oct 11 at 14:29   View User's Profile U2U Member Reply With Quote
I reckon it would take off.
Gary
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4th Oct 11 at 14:32   View Garage View User's Profile U2U Member Reply With Quote
Even on a coveyor belt?
JonnyJ
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4th Oct 11 at 14:33   View User's Profile U2U Member Reply With Quote
Especially on a conveyor belt
Gary
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4th Oct 11 at 14:34   View Garage View User's Profile U2U Member Reply With Quote
lies
xa0s
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4th Oct 11 at 14:55   View User's Profile U2U Member Reply With Quote
I really want it to be tested
Jake
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4th Oct 11 at 15:04   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Gary Dove
lies

 
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