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## Q. 9.1

Lycopodium spores with diameter 4.2 µm have a sedimentation velocity in air of 0.50 mm $s^{-1}$. Estimate their drag coefficient.

## Verified Solution

As $Re_{p}$ is small ($Re_{p} = 0.5 \times 10^{-3} \times 4.2 \times 10^{-6} / 15\times 10^{-6} = 0.14 \times 10^{-3}$), use the relation $c_{d} = 24 / Re_{p} = 171$.