A water stream contacts a bed of particles, which have diameters ranging from 1 to $1000 mu

Question:

A water stream contacts a bed of particles, which have diameters ranging from 1 to $1000 \mu \mathrm{m}$ and $S G=2.5$. The water stream flows upward at a rate of $3 \mathrm{~cm} / \mathrm{s}$. What size particles will be carried out by the stream, and what size will be left behind?

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