Q$2$ A finely ground mixture of galena and limestone in the proportion of $1$ to $4$ by mass is subjected to an upward flowing stream of water at a velocity of $5\frac{m}{s}.$ Assuming the size distribution of each material is the same, estimate the percentage of galena in the material being carried away by the upward stream and the percent in the material left behind. You can assume Stoke's Law applies.

Viscosity of water $1{10}^{-3}Pa.$s

${}_{\text{g}\text{a}\text{l}\text{e}\text{n}\text{a}}=7500k\frac{g}{m^3}$

${}_{limestone}=2700k\frac{g}{m^3}$

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