Using the apparatus from the Viscosity and Viscous Flow lab, data were collected

Question

Using the apparatus from the Viscosity and Viscous Flow lab, data were collected on an unknown liquid with a density of 3.0 g/cm^3 and displayed in the graph as the natural log of the pressure in dynes/cm^2, LnP, versus time. What is the liquid's viscosity? a. 8.9 times10^-3 poise b. 7.3 times 10^-4 poise c. 2.5 times 10^-2 poise d. 3.8 times 10^-3 poise One sphere is charge to 5,000 V, and the other sphere is changed to 10,000 V in the Coulomb's Law lab. If the distance between the two spheres is 9.0 cm, what is the force between then? a. 5.5 times 10^-4 n b. 9.7 times 10^-4 N c. 2.4 times 10^-4 N d.1.67 times 106^-1 N If a conducting sphere in the Coulomb's law lab is charged to 8,000 V, the amount of charge on it is a. 2.53 times 10^-3 C. b. 2.02 times 10^1 C. c. 3.84 times 10^15 C. d. 1.67 times 10^-8 C.

Explanation / Answer

The potential on the charged sphere is,

     V = k q / r

Here, q is the charge on the sphere, k is coulomb constant, and r is the radius of the sphere.

   q = V r / k

Here, V = 8000 V

        K = 9 x 10 ^9 N m^2 / C^2

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