The most dangerous particles in polluted air are those with diameters less than 2.5 mm because they

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The most dangerous particles in polluted air are those with diameters less than 2.5 mm because they can penetrate deeply into the lungs. A 15-cm-tall closed container holds a sample of polluted air containing many spherical particles with a diameter of 2.5 μm and a mass of 1.4 × 10^-14 kg. How long does it take for all of the particles to settle to the bottom of the container?

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