A metal block of area $0.10$ ${\mathrm{m}}^{2}$ is connected to a 0.010 kg mass via a string that passes over an ideal pulley (considered massless and frictionless), as in the figure below. A liquid film with a thickness of 0.30 mm is placed between the block and the table. When released the block moves to the right with a constant speed of 0.085 m/s. The coefficient of viscosity of the liquid is:

1. $$4.45 \times 10^{-2} ~\text{Pa-s}$$
2. $$4.45 \times 10^{-3} ~\text{Pa-s}$$
3. $$3.45 \times 10^{-2} ~\text{Pa-s}$$
4. $$3.45 \times 10^{-3} ~\text{Pa-s}$$

Subtopic:  Viscosity |
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The terminal velocity of a copper ball of radius 2.0 mm falling through a tank of oil at is 6.5 $\mathrm{cm}/\mathrm{s}$. The viscosity of the oil at  is? (Density of oil is , the density of copper is

1.

2.

3.

4.

Subtopic:  Viscosity |
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