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Old 10-12-2010   #1 (permalink)
aŮejo
 
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Question Cork In a Glass

If a cork is put into a glass of water, the cork will almost always drift to the side of the glass. There is one simple way, however, to get the cork to float in the center of the glass (the horizontal center, not the vertical). What is it? Water, the glass, and the cork are all that is required.

EDIT: You may have noticed this thread was closed as soon as it was created. That was not intended to limit your input or enjoyment in any way. On the contrary, your participation is most welcome. The action was taken to prevent eager Peeps from going into some search engine, finding the answer, and posting it, as happened on several occasions in the past. (Of course I harvest a lot of this material from other sources. You didnít think I create it all myself, did you? Iím good, but Iím not that good!) Regrettably, that also means that folks who legitimately work out their own answers, and would like to post them, donít get to display their prowess, but Iím afraid that canít be helped. Iíll open the thread in a couple of days, when Peeps have had an opportunity to try their hand at a solution, and you can post away then. The official answer will come a bit after that. I appreciate your patience and understanding, and hope you enjoy the exercise.
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Old 10-17-2010   #2 (permalink)
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Okey Doke. What do you think?
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Old 10-24-2010   #3 (permalink)
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The Official Answer

The reason that a cork drifts to the side of a glass is that it floats to the highest point. Since water "clings" to the glass, the highest point is around the edge of the water. To get the cork to float in the middle of the glass, all you have to do is fill the glass as much as possible. The water will form a convex shape above the glass, with the highest point at its center. This is where the cork will settle.
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