Question 1

A scuba diver losing her air supply while far beneath the water surface is advised when ascending to

Accepted Answer

A) hold air in her lungs. 
B) allow air to escape her lungs. 
C) swallow a bit of water. 
D) panic. 
A) hold air in her lungs. 
B) allow air to escape her lungs. 
C) swallow a bit of water. 
D) panic.

Question 2

As water in a confined pipe speeds up,the pressure it exerts against the inner walls of the pipe

Accepted Answer

A) increases. 
B) decreases. 
C) remains constant if flow rate is constant. 
D) none of the above 
A) increases. 
B) decreases. 
C) remains constant if flow rate is constant. 
D) none of the above

Question 3

A completely submerged object always displaces its own

Accepted Answer

A) volume of fluid. 
B) weight of fluid. 
C) density of fluid. 
D) all of the above 
E) none of the above 
A) volume of fluid. 
B) weight of fluid. 
C) density of fluid. 
D) all of the above 
E) none of the above

Question 4

Consider two vertical tubes of equal cross-section area,one containing water and the other mercury.If the liquid pressures at the bottom of the tubes are equal,both liquids would have equal

Accepted Answer

A) volumes. 
B) densities. 
C) weights. 
D) number of molecules. 
E) none of the above 
A) volumes. 
B) densities. 
C) weights. 
D) number of molecules. 
E) none of the above

Question 5

When an ice cube in a glass of water melts,the water level

Accepted Answer

A) rises. 
B) falls. 
C) remains the same. 
A) rises. 
B) falls. 
C) remains the same.

Question 6

If a battleship sinks in a canal lock,the water level in the lock

Accepted Answer

A) rises. 
B) falls. 
C) remains unchanged. 
A) rises. 
B) falls. 
C) remains unchanged.

Question 7

It would be easier to pull evacuated Magdeburg hemispheres apart if they were

Accepted Answer

A) held upside down. 
B) at sea level. 
C) 2 km beneath the ocean surface. 
D) 2 km above the ocean surface. 
E) none of the above 
A) held upside down. 
B) at sea level. 
C) 2 km beneath the ocean surface. 
D) 2 km above the ocean surface. 
E) none of the above

Question 8

When you float in fresh water,the buoyant force that acts on you is equal to your weight.When you float higher in the denser water of the Dead Sea,the buoyant force that acts on you is

Accepted Answer

A) greater than your weight. 
B) less than your weight. 
C) equal to your weight. 
A) greater than your weight. 
B) less than your weight. 
C) equal to your weight.

Question 9

A lobster crawls onto a bathroom scale submerged on the ocean bottom.Compared to its weight above the surface,its weight under water is

Accepted Answer

A) greater. 
B) less. 
C) the same. 
A) greater. 
B) less. 
C) the same.

Question 10

The buoyant force that acts on a submerged object is equal to

Accepted Answer

A) the object's weight. 
B) the object's volume. 
C) both the weight and volume of the object. 
D) the weight of water it displaces. 
A) the object's weight. 
B) the object's volume. 
C) both the weight and volume of the object. 
D) the weight of water it displaces.

Question 11

Compared with the buoyant force of the atmosphere on a helium-filled balloon,the buoyant force of the atmosphere on a nearby wood block of the same volume is

Accepted Answer

A) considerably less. 
B) considerably more. 
C) the same. 
A) considerably less. 
B) considerably more. 
C) the same.

Question 12

Explain why ships of any weight are balanced on the Falkirk Wheel.

Accepted Answer

The levels of water in the two Falkirk c

Question 13

As a swimmer dives deeper and deeper,strictly speaking,the volume of water displaced by the swimmer actually

Accepted Answer

A) decreases. 
B) increases. 
C) remains unchanged but pressure on her increases 
D) none of the above 
A) decreases. 
B) increases. 
C) remains unchanged but pressure on her increases 
D) none of the above

Question 14

When a chocolate bar is cut in half,its density of each half is

Accepted Answer

A) halved. 
B) unchanged. 
C) doubled. 
A) halved. 
B) unchanged. 
C) doubled.

Question 15

When a shower is turned on,the shower curtain moves towards the water spray.This partly involves

Accepted Answer

A) capillary action. 
B) surface tension. 
C) pressure changes in moving fluids. 
D) none of the above 
A) capillary action. 
B) surface tension. 
C) pressure changes in moving fluids. 
D) none of the above

Question 16

An iron ball is placed in a pie pan that floats in a bucket.The water level is marked at the side of the bucket.Then the iron ball is removed and allowed to sink in the bucket.The water line at the side of the bucket is

Accepted Answer

A) lower. 
B) the same. 
C) higher. 
A) lower. 
B) the same. 
C) higher.

Question 17

The principle of continuity states that for fluid flow to be continuous it must

Accepted Answer

A) speed up in narrow regions of flow. 
B) slow down in wide regions of flow. 
C) both of these 
D) neither of these 
A) speed up in narrow regions of flow. 
B) slow down in wide regions of flow. 
C) both of these 
D) neither of these

Question 18

A hydraulic device has two pistons,one with a small cross-section area and another piston with a larger cross-section area.If a given force is applied to the small piston,the output force on the larger-area piston will be

Accepted Answer

A) less. 
B) the same. 
C) greater. 
D) all of the above 
E) none of the above 
A) less. 
B) the same. 
C) greater. 
D) all of the above 
E) none of the above

Question 19

A dam is thicker at the bottom than at the top because

Accepted Answer

A) water is denser at deeper levels. 
B) water pressure is greater at deeper levels. 
C) water is cooler at deeper levels. 
D) dams look better. 
E) none of the above 
A) water is denser at deeper levels. 
B) water pressure is greater at deeper levels. 
C) water is cooler at deeper levels. 
D) dams look better. 
E) none of the above

Question 20

Which is greater,the buoyant force that acts on an elephant,or on a helium-filled party balloon? Explain why the balloon rises in air and the elephant doesn't.

Accepted Answer

The buoyant force exerted by the atmosph

Exam 5: Fluid Mechanics

A scuba diver losing her air supply while far beneath the water surface is advised when ascending to

As water in a confined pipe speeds up,the pressure it exerts against the inner walls of the pipe

A completely submerged object always displaces its own

Consider two vertical tubes of equal cross-section area,one containing water and the other mercury.If the liquid pressures at the bottom of the tubes are equal,both liquids would have equal

When an ice cube in a glass of water melts,the water level

If a battleship sinks in a canal lock,the water level in the lock

It would be easier to pull evacuated Magdeburg hemispheres apart if they were

When you float in fresh water,the buoyant force that acts on you is equal to your weight.When you float higher in the denser water of the Dead Sea,the buoyant force that acts on you is

A lobster crawls onto a bathroom scale submerged on the ocean bottom.Compared to its weight above the surface,its weight under water is

The buoyant force that acts on a submerged object is equal to

Compared with the buoyant force of the atmosphere on a helium-filled balloon,the buoyant force of the atmosphere on a nearby wood block of the same volume is

Explain why ships of any weight are balanced on the Falkirk Wheel.

As a swimmer dives deeper and deeper,strictly speaking,the volume of water displaced by the swimmer actually

When a chocolate bar is cut in half,its density of each half is

When a shower is turned on,the shower curtain moves towards the water spray.This partly involves

An iron ball is placed in a pie pan that floats in a bucket.The water level is marked at the side of the bucket.Then the iron ball is removed and allowed to sink in the bucket.The water line at the side of the bucket is

The principle of continuity states that for fluid flow to be continuous it must

A hydraulic device has two pistons,one with a small cross-section area and another piston with a larger cross-section area.If a given force is applied to the small piston,the output force on the larger-area piston will be

A dam is thicker at the bottom than at the top because

Which is greater,the buoyant force that acts on an elephant,or on a helium-filled party balloon? Explain why the balloon rises in air and the elephant doesn't.

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Time - Reading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: The Nature of Science

Filters