Fluid Statics Quiz

Buoyancy is the tendency for objects to float in a fluid. We consider buoyancy the...

• Un-gravity force

• The upward force

• Gravitational pull

• Downwards pull on an object

What happens to the pressure if the area is decreased while force remains constant?

• Pressure decreases

• Pressure remains the same

• Pressure increases

• Pressure becomes zero

Which of the following statements best describes hydrostatic pressure?

• Hydrostatic pressure is the pressure exerted by a fluid in motion, which increases with the fluid's velocity.

• Hydrostatic pressure is the pressure exerted by a stationary fluid, which increases with depth due to the weight of the fluid above.

• Hydrostatic pressure is the force per unit area that decreases with increasing depth in a fluid.

• Hydrostatic pressure depends only on the type of container holding the fluid and remains constant at all depths.

According to Pascal's Law, what happens when pressure is applied to a confined fluid?

• The pressure is transmitted equally in all directions

• The pressure only increases at the point of application

• The fluid stops moving

• The pressure decreases throughout the fluid

Which of the following statements accurately describes the relationship between absolute, atmospheric, gauge, and vacuum pressure?

• Gauge pressure is always higher than absolute pressure since it includes atmospheric pressure.

• Atmospheric pressure is the difference between absolute pressure and gauge pressure.

• Vacuum pressure is the difference between absolute pressure and gauge pressure.

• Absolute pressure is the sum of atmospheric pressure and gauge pressure, while vacuum pressure is measured below atmospheric pressure.

What is the primary factor that determines the magnitude of buoyant force acting on an object submerged in a fluid?

• The temperature of the fluid

• The color of the object

• The density of the fluid

• The shape of the object

A mechanic is using a hydraulic car lift in an auto repair shop to raise a car for an undercarriage inspection. The lift operates using a hydraulic press with a large platform (ram) that has a diameter of 30 cm and a smaller lever (plunger) with a diameter of 5 cm. To operate the lift, the mechanic pushes down on the plunger with a force of 400 N.

How much weight can this hydraulic press lift on the platform, allowing the mechanic to easily raise the car?

(10 points)

1. The pressure intensity at a point in a fluid is given 4.28 N/cm². Find the corresponding height of fluid when it is (a)water, and (b) an oil of sp. gr. 0.9

2. (10 points)

What are the gauge pressure and absolute pressure at a point of 4m below the surface of a liquid having density of 0.00162 kg/cm³ if the atmospheric pressure is equivallent to 760mm of mercury? The specific gravity of mercury is 13.6.

(10 points)

A uniform wooden cylinder with a diameter of 0.5 m and a height of 1 m is carefully lowered into seawater and floats vertically. The average density of the cylinder is 410 kg/m³, and the density of seawater is 1,025 kg/m³.

(a) What is the volume of the cylinder?
(b) What volume of the cylinder will be submerged when it floats in equilibrium?
(c) How much of the cylinder’s height will remain above the surface of the water?

(10 points)