Mechanical Properties of Fluids Physics - Mechanical Properties of Fluids

The angle of contact at the interface of water-glass is 0°, Ethylalcohol-glass is 0°, Mercury-glass is 140° and Methyliodideglass is 30°. A glass capillary is put in a trough containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the trough is:

1. Water
2. Ethylalcohol
3. Mercury
4. Methyliodide

Along a streamline:

1. The velocity of a fluid particle remains constant.
2. The velocity of all fluid particles crossing a given position is constant.
3. The velocity of all fluid particles at a given instant is constant.
4. The speed of a fluid particle remains constant.

For a surface molecule:

1. The net force on it is zero.
2. There is a net downward force.
3. The potential energy is less than that of a molecule inside.
4. The potential energy is more than that of a molecule inside.

Which of the following diagrams does not represent a streamline flow?

This model of the atmosphere works for relatively small distances. Identify the underlying assumption that limits the model.

Is surface tension a vector?

Is viscosity a vector?

Considering the pressure p to be proportional to the density, find the pressure p at a height h if the pressure on the surface of the earth is p₀.

The sap in trees, which consists mainly of water in summer, rises in a system of capillaries of radius r = 2.5 × 10^-5m. The surface tension of sap is T = 7.28 × 10^-2N m^-1 and the angle of contact is 0°. Does surface tension alone account for the supply of water to the top of all trees?

The sufrace tension and vapour pressure of water at 20°C is 7.28 × 10^-2N m^-1 and 2.33 × 10³ Pa, respectively. What is the radius of the smallest spherical water droplet which can form without evaporating at 20°C?

Two mercury droplets of radii 0.1cm. and 0.2cm. collapse into one single drop. What amount of energy is released? The surface tension of mercury T = 435.5 × 10^-3N m^-1

Considering the pressure p to be proportional to the density, find the pressure p at a height h if the pressure on the surface of the earth is p₀.