1. Sucrose is allowed to diffuse along a 10-cm length of tubing filled with water. The tube is 6.0 cm2 in crosssectional area. The diffusion coefficient is equal to 5.0 × 10-10 m2/s, and 8.0 × 10-14 kg is transported along the tube in 15 s. What is the difference in the concentration levels of sucrose at the two ends of the tube?
2. Glycerin in water diffuses along a horizontal column that has a cross-sectional area of 2.0 cm2. The concentration gradient is 3.0 × 10-2 kg/m4, and the diffusion rate is found to be 5.7 × 10-15 kg/s. Determine the diffusion coefficient.
3. The viscous force on an oil drop is measured to be 3.0 × 10-13 N when the drop is falling through air with a speed of 4.5 × 10-4 m/s. If the radius of the drop is 2.5 × 10-6 m, what is the viscosity of air?
4. Small spheres of diameter 1.00 mm fall through 20°C water with a terminal speed of 1.10 cm/s. Calculate the density of the spheres.
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