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Author Topic: Cheerios attract!
Jonathan
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Icon 6 posted July 10, 2004 13:22      Profile for Jonathan   Author's Homepage         Edit/Delete Post   Reply With Quote 
Howdy! I was listening to npr a few days ago and they had some guy ask, "why do cheerios stick together?" The awnser was the milk between the cheerios made a thick membrane that made the cheerios attract!
Posts: 147 | From: Somewhere over the rainbow | Registered: May 2004  |  IP: Logged
mdee2004
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Icon 3 posted July 17, 2004 23:58      Profile for mdee2004     Send New Private Message       Edit/Delete Post   Reply With Quote 
I'm not sure about them sticking together but I know that surface tension of the milk makes them want to move towards the side of the bowl. Think of a giant drop that curves down at the sides.

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MrMachineCode
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Icon 3 posted July 18, 2004 07:47      Profile for MrMachineCode     Send New Private Message       Edit/Delete Post   Reply With Quote 
You can actually make a surface tension "warp drive" out of some aluminum foil and a drop of dish soap. Fold the aluminum into a tiny flat bottomed boat or raft and make the boat very shallow at the back end. You want the boat to ride just on the surface of the water like a water strider bug. Cut a small slit (like the forked tongue of a snake) in the middle of the very back portion of the boat, so that if you put a drop of soap on there some of the soap will go out into the water, but not so much that the water could come back in and water log the boat. Put the boat, with it's drop of soap on the back, into a tub of fresh, clean water (not soapy water) and the boat will whiz aroud the tub. The reason it works is that normally the surface tension exerts equal force on all sides, but when there's soap leaking out the back of the boat the soap breaks down the surface tension on the water on that side and it stops pulling on it. Now there's nothing to balance the surface tension on the front of the boat so it gets pulled forward. The only problem is that if the water gets too soapy, then there won't be much surface tension anywhere in the tub and the boat will stop moving. A good Trekkie will realize this is just like the principle Warp engines work on--it makes space pull on the front of the ship more than the back of it. In fact, there was even an episode of Star Trek where they found out that overuse of warp drives was "polluting" space just like how the soap raft eventually gets the water so soapy that it stops working. I think they came up with some technological solution so they could morally keep using warp drives. The soap raft wouldn't work for human sized boats because at that size the effects of surface tension are too small to matter.

You see water striders move rapidly across the surface of a pond--I wonder if these bugs spit into the water on one side to move in the other direction?

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TMBWITW,PB

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Icon 1 posted July 18, 2004 10:37      Profile for TMBWITW,PB     Send New Private Message       Edit/Delete Post   Reply With Quote 
quote:
Originally posted by MrMachineCode:
I think they came up with some technological solution so they could morally keep using warp drives

Nope, they just decided that you can't go over warp 5 (or so) unless it was an emergency. Apparantly high warp speeds "polluted" much more quickly.

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