Mechanics | Relativity Answers

The viscosity of a fluid is to be measured by a
viscometer constructed of two 40-cm-long
concentric cylinders (adjacent Fig.). The outer
diameter of the inner cylinder is 12 cm, and
the gap between the two cylinders is 0.15 cm.
The inner cylinder is rotated at 300 rpm, and
the torque is measured to be 1.8 N m.
Determine the viscosity of the fluid?

1. What is a Newtonian fluid? Is water a Newtonian fluid?
2. How does viscousities of (a) liquids and (b) gases vary with
temperature?

1. What is specific gravity? How is it related to density?
2. Under what conditions is the ideal-gas assumption suitable for real
gases?
3. What is flow energy? Do fluids at rest possess any flow energy?
4. What is coefficient of compressibility of a fluid represent?
5. What does the coefficient of volume expansion of a fluid represent?
6. What is viscousity? What is the cause of it in liquids and in gases?
Do liquids or gases have higher dynamic viscousities?

When analyzing the acceleration of gases as they flow through a
nozzle, what would you choose as your system? What type of
system is this?

What is a boundary layer? What causes a boundary layer to
develop?

1. What is a steady flow process?
2. Consider the flow of gases over the wings of an aircraft. Is this flow
external or internal?

Define stress, normal stress, shear stress, and pressure.

What is the no-slip condition? What causes it?

What is a fluid? How does it differ from a solid? How does a gas
differ form a liquid?

A uniform metre rule of mass 90g is pivotted at the 40cm mark. If the ruler is equilibrium with an unknown mass M, placed at 10cm mark, and 79g mass at the 70cm mark. Find the mass M