1. Basics of Fluid Mechanics – I

Try these first

1. 1.

   What are the three basic dimensions in fluid mechanics?

   Hint

   Think fundamental physics dimensions.

2. 2.

   Define velocity.

   Hint

   Think of its formula.

3. 3.

   What is dynamic viscosity a measure of?

   • Resistance to flow
   • Mass per volume
   • Weight per volume

   Hint

   Consider how thick versus thin liquids behave.

4. 4.

   True or False: Viscosity increases with temperature in both liquids and gases.

   • True
   • False

   Hint

   Think of how syrup behaves when heated.

5. 5.

   A fluid has a dynamic viscosity of 0.85 Pa.s and flows through a pipe with a radius of 0.1 m. Calculate the shear stress if the flow velocity is 2 m/s.

   Hint

   Use the definition linking shear stress to viscosity and flow parameters.

6. 6.

   If a liquid's density is 1200 kg/m³ and the acceleration due to gravity is 9.81 m/s², what is its specific weight?

   Hint

   Recall the formula for specific weight.