Fluid Mechanics

All fluids are:

• gases

• liquids

• gases or liquids

• non-metallic

Which of the following is a fluid?

• helium
• ice
• iron
• gold

Which of the following is NOT a fluid?

• carbon dioxide
• hydrogen
• seawater
• wood

Which of the following statements is NOT correct?

• A fluid flows
• a fluid has a definite shape
• molecules of a fluid are free to move past each other
• a fluid changes it shape easily

To obtain the absolute pressure from the gauge pressure:

• subtract atmospheric pressure

• add atmospheric pressure

• subtract 273

• add 273

Several cans of different sizes and shapes are all filled with the same liquid to the same depth. Then,

• The pressure on the bottom of each can is the same

• The weight of the liquid on the bottom of each can is the same

• The least pressure is at the bottom of the can with the largest bottom area

• the force of the liquid on the bottom of each can is the same

The vessels shown above all contain water to the same height. Rank them according to the pressure exerted by the water on the vessel bottoms, least to greatest.

• 1,2,3,4

• 3,4,2,1

• 4,3,2,1

• 2,3,4,1

• All pressures are the same

The diagram shows a U-tube with cross-sectional area A and partially filled with oil of density  $\rho$  . A solid cylinder, which fits the tube tightly but can slide without friction, is placed in the right arm. The system is in equilibrium. The weight of the cylinder is:

•  $AL\rho g$  

•  $L^3\rho g$  

•  $A\rho\left(L+h\right)g$  

•  $A\rho\left(L-h\right)g$  

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Archimedes' Principle states that... 

• The buoyant force acting on an object equals the volume of the fluid displaced by the object. 
• The buoyant force acting on an object equals the weight (force of gravity) of the fluid displaced by the object.
• The buoyant force acting on an object will always be equal. 

According to Archimedes' principle, if a body is immersed partially or fully in a fluid then the buoyancy force is _______ the weight of fluid displaced by the body.

• equal to

• less than

• more than

• unpredictable