Assignment No. - 01

Title: Basic Concepts

 

 

Date of submission:

 

Cross those boxes corresponding to questions that you have not  attempted

 

1.     What is the difference between a definition and a concept ?

2.     What is the composition of the universe ? What is the fluid of space ? Is the flow of electrons a fluid ? Explain.

3.     Define and relate the operators D/Dt, ∂/∂t, and d/dt. Give the physical meaning of D( ) / Dt,  ∂( )/∂t,  D/Dt ∫ ( )dV,  ∂/∂t ( ) dV.

4.     Define a fluid ?

5.     There are fluids called super fluids. Find what are and how they would be plotted in the given fig.FM-1,What is a Plasma, and how would it be plotted in the given fig.FM-1?

Figure. FM-1

6.     What is the surface tension of water in contact with air at 54°F in (a) dynes/cm, (b) N/m, and (c)lbf/ft ?

7.     When a bottle of coke is opened gas bubbles form due to a sudden reduction in pressure. Assuming the coke is at 34°F, what is the pressure difference between the inside and outside of a bubble if the bubble’s diameter is 0.001 in. ?

8.     What is the approximate capillary rise of water at 20° and standard atmosphere pressure in contact with air in a clean glass tube 10 mm in diameter.

9.  A cylinder of 0.12 m radius rotates concentrically inside a fixed hollow cylinder of 0.13 m radius. Both the cylinders are 0.3 m long. Determine the viscosity of the liquid which fills the space between the cylinders if a torque of 0.88 Nm is required to maintain an angular velocity of 2¶ rad/s.

10. A piston 79.2 mm diameter and 210 mm long works in a cylinder 80 mm diameter. If the annular space is filled with a lubricating oil having a viscosity of 0.065 kg/ms, calculate the speed with which the piston will move through the cylinder when an axial load of 85.6 N is applied. Neglect the inertia of the piston.