1) Liquid water is usually assumed to be an incompressible fluid. This means tha

Question

1) Liquid water is usually assumed to be an incompressible fluid. This means that

a) the density of liquid water is constant for all temperatures and pressures.
b) due to changes in temperature and pressure, the density of water changes, but the change is small relative to the value of the density.
c) the density of liquid water is large relative to that of air in the atmosphere.
d) all of the properties of water (density, specific weight, viscosity) are constant for all flow processes.

2) The ideal gas equation can be used to predict the behavior of:

A) Air at standard temperature and pressure
B) Water at standard temperature and pressure
C) Nitrogen at standard temperature and pressure
D) A and B.
E)A and C.

3) A viscous fluid flows over a stationary flat plate. The coordinate system is as shown.

The correct statement about the velocity and the velocity gradient at the wall at location 1 is

a) the velocity component u at the plate is zero and the gradient

4) In a fluid

a) pressure acts parallel to a surface.
b) Pressure acts normal to a surface.
c) Pressure acts both normal and parallel to a surface.

5) The velocity at two points in a fluid are measured, as indicated below. It is desired to determine
the viscous shear stress in the fluid.

The expression that will yield the shear stress at location y is

a)

b)

c)

d)

Liquid water is usually assumed to be an incompressible fluid. This means that the density of liquid water is constant for all temperatures and pressures. due to changes in temperature and pressure, the density of water changes, but the change is small relative to the value of the density. the density of liquid water is large relative to that of air in the atmosphere. all of the properties of water (density, specific weight, viscosity) are constant for all flow processes. The ideal gas equation can be used to predict the behavior of: Air at standard temperature and pressure Water at standard temperature and pressure Nitrogen at standard temperature and pressure A and B. A and C. A viscous fluid flows over a stationary flat plate. The coordinate system is as shown. The correct statement about the velocity and the velocity gradient at the wall at location 1 is the velocity component u at the plate is zero and the gradient is zero. the velocity component u at the plate is finite and the gradient is zero. the velocity component u at the plate is zero and the gradient is finite. the velocity component u at the plate is finite and the gradient is finite. In a fluid pressure acts parallel to a surface. Pressure acts normal to a surface. Pressure acts both normal and parallel to a surface. The velocity at two points in a fluid are measured, as indicated below. It is desired to determine the viscous shear stress in the fluid. The expression that will yield the shear stress at location y is

Explanation / Answer

due to changes in temperature and pressure, the density of water changes, but the change is small relative to the value of the density.

Nitrogen at standard temperature and pressure

c

Pressure acts normal to a surface.

d

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