A buoyant force acts in the opposite direction of gravity. Therefore, which of the following is true of an object completely submerged in water?

The net force on the object is smaller than the weight of the object.

The net force on the object is larger than the weight of the object.

The net force on the object is equal to the weight of the object.

The object appears to weigh more than it does in air.

Which of the following statements about floating objects is correct?

The buoyant force equals the object's weight.

The object's density is greater than the density of the fluid on which it floats.

The object's density is equal to the density of the fluid on which it floats.

The displaced volume of the fluid is greater than the volume of the object.

Which of the following statements about completely submerged objects resting on the ocean bottom is correct?

The apparent weight of the object depends on the object's density.

The buoyant force acting on the object is equal to the object's weight.

The displaced volume of fluid is greater than the volume of the object.

The weight of the object and the buoyant force are equal and opposite.

If an object is only partially submerged in a fluid, which of the following is true?

The density of the fluid is greater than the density of the object.

The volume of the displaced fluid equals the volume of the object.

The density of the fluid equals the density of the object.

The density of the fluid is less than the density of the object.

Which of the following statements is true according to Pascal's Principle?

Pressure in a fluid is the same throughout the fluid.

Pressure in a fluid is greatest at the walls of the container holding the fluid.

Pressure in a fluid is greatest at the center of the fluid.

Pressure in a fluid is greatest at the top of the fluid.

Which of the following statements is always true?

Pressure always increases when force increases or the area acted on decreases.

Pressure always increases when force increases or the area acted on increases.

Pressure always increases when force decreases or the area acted on increases.

Pressure always increases when the force decreases or the area acted on decreases.

What factors affect the gauge pressure within a fluid?

fluid density, depth, free-fall acceleration

fluid volume, depth, free-fall acceleration

fluid mass, depth, free-fall acceleration

fluid weight, depth, free-fall acceleration

What does the difference between gauge pressure and absolute pressure equal?

the pressure at the surface of the fluid

the pressure at the bottom of the fluid

What does the net force between two levels in a fluid equal?

the weight of the fluid between the levels

the weight of the fluid above the top level

the force applied to the fluid's surface

the force applied to the fluid's sides

Which of the following is NOT an example of laminar flow?

smoke twisting as it moves upward from a fire

a river moving slowly in a straight line

smoke rising upward in a smooth column through air

water flowing evenly from a slightly opened faucet

Which of the following is NOT an example of turbulent flow?

a river flowing slowly in a straight line

a river flowing swiftly around rocks in rapids

water flowing unevenly from a fully opened faucet

smoke twisting as it moves upward from a fire

Why does an ideal fluid move faster through a pipe with a decreasing diameter?

The pressure within the fluid decreases.

The pressure within the fluid increases.

The pipe exerts more pressure on the fluid.

Why does the lift on an airplane wing increase as the speed of the airplane increases?

The pressure above the wing becomes less than the pressure below the wing.

The pressure behind the wing becomes less than the pressure in front of the wing.

The pressure behind the wing becomes greater than the pressure in front of the wing.

The pressure above the wing becomes greater than the pressure below the wing.

For an ideal fluid flowing through a horizontal pipe, Bernoulli's principle and the continuity equation state that the pressure within the pipe does which of the following? (Assume measurements are taken along the pipe in the direction of the fluid flow).

Pressure increases as the pipe diameter increases.

Pressure decreases as the pipe diameter increases.

Pressure remains constant as the pipe diameter increases.

Pressure increases, then decreases as the pipe diameter increases.

Which of the following occurs to a person standing near the edge of a railroad track when a high-speed train passes?

The person tends to be pulled toward the train.

The person tends to be pushed away from the train.

The person tends to be pushed upward into the air.

The person is unaffected by the train.

What happens when a person blows between two pare cups that are hung by strings 10 cm apart?

The cups move toward each other.

The cups move away from each other.

Why is the base of a dam thicker than the top part of the dam?

The weight, and therefore pressure, increase with depth, so it must withstand greater pressure at the base.

The cement, when poured, tends to settle and naturally form a thicker base.

Architects tend to find the design more visually appealing.

The top is thinner so that the fish in the upper reservoir can easily jump over the edge and swim safely downstream.

Compare gauge pressure with absolute pressure.

Gauge pressure is pressure in a fluid, or pressure exerted by the fluid on the walls of the container, or pressure at a depth within a fluid due to its own weight. Absolute pressure is the total pressure on the fluid, which equals the pressure exerted at the surface plus the gauge pressure.

Absolute pressure is pressure in a fluid, or pressure exerted by the fluid on the walls of the container, or pressure at a depth within a fluid due to its own weight. Gauge pressure is the total pressure on the fluid, which equals the pressure exerted at the surface plus the absolute pressure.

Absolute pressure and gauge pressure are the same thing.

Gauge pressure is pressure in the air, or pressure exerted by the fluid on the walls of the container, or pressure at the surface due to the weight of the liquid. Absolute pressure is the total pressure on the fluid, which equals the pressure exerted at a depth plus the gauge pressure.

What does Bernoulli's principle state will happen to the pressure in a fluid as the speed of the fluid increases?

The pressure of the fluid will decrease.

The pressure of the fluid will increase.

The force of the fluid will increase.

The area of the fluid will increase.

Using Bernoulli's principle, explain why a nozzle on a fire hose is tapered.

So that it reduces the pressure on the water flow, thus increasing the speed and distance it may travel.

To be more aerodynamically sound.

To increase the potential and kinetic energy of the water molecules moving through the nozzle.

So that it increases the pressure on the water flow, thus increasing the speed and distance it may travel.

A ship floats 0.186 m higher when in sea water than it does in fresh water. Given the density of seawater (1.0250 g/cm 3 ) and fresh water (1.000 g/cm 3 ), determine how much of the ship's hull lies beneath the surface of both kinds of water.

7.44 m in sea water, 7.63 in fresh water

7.63 m in sea water and 7.44 in fresh water

The ship would sink in fresh water and sit at 7 m in sea water.

A circular hatch in the hull of a submarine has a radius of 51.2 cm. The submarine is 451.4 m under water. If atmospheric pressure above the ocean is 1.01 x 10 5 Pa and the air pressure inside the submarine is 1.34 x 10 5 Pa, what net force is exerted on the hatch? (density of sea water = 1025 kg/m 3 )

I don't know, my brain just turned to mush.

Methane gas in a pipe with a radius of 0.43 m has a density of 0.78 kg/m 3 and a speed of 3.8 m/s. The pipe radius narrows to 0.19 m, and the gas speed increases to 13 m/s. What is the new density of the gas?

Since gas is a fluid, its density will not change.

Fluid Mechanics

Authored by Heather Parajara

Physics

11th - 12th Grade

Used 24+ times

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49 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a fluid?

helium

ice

iron

gold

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a fluid?

carbon dioxide

hydrogen

seawater

wood

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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 its shape easily.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does a liquid differ from a gas?

A liquid has both definite shape and definite volume, whereas a gas has neither.

A liquid has definite volume, unlike a gas.

A liquid has definite shape, unlike a gas.

A liquid has definite shape, whereas a gas has definite volume.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When a gas is poured out of one container into another container, which of the following does NOT occur?

The gas flows into the new container.

The gas changes shape to fit the new container.

The gas spreads out to fill the new container.

The gas keeps its original volume.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

For incompressible fluids, density changes little with changes in...

depth.

temperature

pressure

free-fall acceleration

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A cube of wood with a density of 0.780 g/cm³ is 10.0 cm on each side. When the cube is placed in water, what buoyant force acts on the wood? (fresh water is 1.00 g/cm³)

7.65 x 10³ N

7.65 N

6.40 N

5.00 N

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Fluid Mechanics

Which of the following is a fluid?

Which of the following is NOT a fluid?

Which of the following statements is NOT correct?

How does a liquid differ from a gas?

When a gas is poured out of one container into another container, which of the following does NOT occur?

For incompressible fluids, density changes little with changes in...

A cube of wood with a density of 0.780 g/cm3 is 10.0 cm on each side. When the cube is placed in water, what buoyant force acts on the wood? (fresh water is 1.00 g/cm3)

A buoyant force acts in the opposite direction of gravity. Therefore, which of the following is true of an object completely submerged in water?

Which of the following statements about floating objects is correct?

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Physics

A cube of wood with a density of 0.780 g/cm³ is 10.0 cm on each side. When the cube is placed in water, what buoyant force acts on the wood? (fresh water is 1.00 g/cm³)