Fluid Mechanics 1

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

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

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. 

If the weight of an object is < the Buoyant Force, the object will ......................

• Sink

• Rise

• Remain at the same level

Which direction does buoyant force always push?

• downward
• upward
• all directions
• sponge bob

The specific gravity of a liquid has

• no unit

• same unit as mass density

• same unit as specific weight

• same unit as specific volume