Spherical Particles of Density 3

question 7

Multiple Choice

Spherical particles of density 3.0 g/cm³ are shaken in a container of water (viscosity = 1.0 *10^-3 N·s/m³) . The water is 8.0 cm deep and is allowed to stand for 30 minutes. What is the radius of the largest particles still in suspension at that time?

• A) 4.5 *10^-6 m
• B) 9.0 *10^-6 m
• C) 2.6 *10^-6 m
• D) 5.6 *10^-6 m

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