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[求助] 求教一个英文题目 和离心运动有关

A mixture of spherical particles having a density of  = 2.0 g/cm3 and consisting of sizes that vary from a few angstroms to a few tenths of a centimeter was subjected to a centrifugal field, ω2 *r, in air at 25 oC.   What are the sizes of particles where the Brownian motion governs the behavior of the particle over centrifugal force at r = 1.5, 10 and 20 cm if ω = 5,000 and 15,000 rpm, respectively?

求教 解题的思路,谢谢了。

[ Last edited by awakening_ on 2013-9-22 at 10:33 ]
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