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3. Particulate matter at an altitude of 8 km in the upper atmosphere has an average diameter of 3 μm. If a particle has
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3. Particulate matter at an altitude of 8 km in the upper atmosphere has an average diameter of 3 μm. If a particle has
3. Particulate matter at an altitude of 8 km in the upper atmosphere has an average diameter of 3 μm. If a particle has a mass of 42.5(10-¹2) g, estimate the time needed for it to settle to the earth. Assume gravity is constant, and for air, p = 1.202 kg/m³ and u= 18.1(10) N. s/m². 8 km
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