First slide

Viscosity

Question

At room temperature a small sphere is falling through a viscous liquid at constant velocity of 10 cm/sec. If the temperature of liquid is increased by 30 ^oC, the terminal velocity of the sphere

Moderate

A

will be more than 10 cm/s
B

will be less than 10 m/s
C

will be equal to 10 m/s
D

cannot be determined due to insufficient data

Solution

Terminal velocity $V_{T} \propto \frac{1}{η}$ , with rise in temperature, viscosity of liquid decreases.
As coefficient of viscosity $(η)$ decreases, $V_{T}$ increases.

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