Fluids 2-9.52

Which of the following statements does not describe an ideal fluid?

• An ideal fluid is incompressible.

• An ideal fluid has internal friction.

• The flow of an ideal fluid is always steady.

• The flow of an ideal fluid is always laminar.

Which type of flow best describes a river moving through rocky rapids?

• steady flow

• laminar flow

• turbulent flow

• viscous flow

What are the irregular motions in a flowing fluid called?

• eddy currents

• turbulent currents

• laminar flows

• nonlinear flows

Which of the following statements about an ideal fluid moving through a pipe with changing diameter provides the basis for the continuity equation?

• The density of the fluid remains constant throughout the pipe.

• The mass of the fluid remains constant throughout the pipe.

• The volume of the fluid remains constant throughout the pipe.

• The speed of the fluid remains constant throughout the pipe.

A fluid has a flow rate of 5.0 m³/s as it travels at a speed of 7.5 m/s through a pipe. What is the cross-sectional area of the pipe?

• 3.8 m²

• 1.5 m²

• 0.67 m²

• 0.27 m²

A fluid flows through a pipe whose cross-sectional area changes from 2.00 m² to 0.50 m². If the fluid’s speed in the wide part of the pipe is 3.5 m/s, what is its speed when it moves through the narrow part of the pipe?

• 0.071 m/s

• 0.88 m/s

• 1.1 m/s

• 14 m/s

Which of the following is a correct statement of Bernoulli’s principle?

• The density of a fluid increases as the fluid’s velocity increases.

• The density of a fluid decreases as the fluid’s velocity increases.

• The pressure in a fluid increases as the fluid’s velocity decreases.

• The pressure in a fluid increases as the fluid’s velocity increases.

The force exerted per unit area is known as

• pressure
• viscosity
• buoyancy

The resistance of a fluid to flowing is known as 

• pressure
• viscosity
• buoyancy

The ability of a fluid to exert an upward force on an object is known as

• pressure
• viscosity
• buoyancy