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Why is quicksand dangerous when you are alone?
asked Aug 10, 2010 by triuser (1,768 points)

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because no one can help u.
answered Aug 10, 2010 by trianswer (22,754 points)
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Quicksand is a non-Newtonian fluid: when undisturbed it often appears to be solid ("gel" form), but a minor (less than 1%) change in the stress on the quicksand will cause a sudden decrease in its viscosity ("sol" form). After the initial perturbation?such as a person attempting to walk on it?the water and sand in the quicksand separate and dense regions of sand sediment form; it is because of the formation of these high volume fraction regions that the viscosity of the quicksand seems to suddenly increase. In order to move within the quicksand, a person or object must apply sufficient pressure on the compacted sand to re-introduce enough water to liquefy it. The forces required to do this are quite large: to remove a foot from quicksand at a speed of one centimeter per second would require the same amount of force as "that needed to lift a medium-sized car."
answered Aug 10, 2010 by trianswer (22,754 points)