Surface Tension and Viscosity

Practice Questions:

Question 1: moderate

The terminal velocity of a copper ball of radius 2.0 mm falling through a tank of oil at 20°C is 6.5 cms–1. Calculate the viscosity of the oil at 20°C. (Density of oil is \[1.7\times 10^{3}kgm^{-3}\] and density of copper is \[8.9\times 10^{3}kgm^{-3}\]) :

1. \[0.69 kg m^{-1} s^{-1}\]

2. \[0.79 kg m^{-1} s^{-1}\]

3. \[0.29 kg m^{-1} s^{-1}\]

4. \[0.99 kg m^{-1} s^{-1}\]

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Question 2: moderate

A lead sphere of mass m falls in viscous liquid with terminal velocity v0. Another lead sphere of mass M falls through the same viscous liquid with terminal velocity 4v0. the ratio M/m is :

1. 2

2. 4

3. 8

4. 16

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