Question 1

If a pressure of 20 kPa is applied to one piston in a simple hydraulic device,the pressure on a piston of larger area will be

Accepted Answer

A) less than 20 kPa. 
B) the same 20 kPa. 
C) more than 20 kPa. 
D) all of the above 
E) none of the above 
A) less than 20 kPa. 
B) the same 20 kPa. 
C) more than 20 kPa. 
D) all of the above 
E) none of the above B

Question 2

When gas in a container expands to three times its volume at constant temperature,the gas pressure

Accepted Answer

A) is one third. 
B) is one ninth. 
C) triples. 
D) remains the same. 
A) is one third. 
B) is one ninth. 
C) triples. 
D) remains the same. A

Question 3

When a gas in a container expands to twice its volume,with no change in temperature,its density

Accepted Answer

A) is half. 
B) doubles. 
C) quadruples. 
D) remains the same. 
A) is half. 
B) doubles. 
C) quadruples. 
D) remains the same. A

Question 4

Buoyant force acts upward on a submerged object because

Accepted Answer

A) it acts in a direction to oppose gravity. 
B) if it acted downward,nothing would float. 
C) the weight of fluid displaced reacts with an upward force. 
D) pressure against its bottom is greater than pressure against its top. 
A) it acts in a direction to oppose gravity. 
B) if it acted downward,nothing would float. 
C) the weight of fluid displaced reacts with an upward force. 
D) pressure against its bottom is greater than pressure against its top.

Question 5

A change in pressure at any point in a confined fluid at rest is transmitted

Accepted Answer

A) undiminished to all points in the fluid. 
B) to points of lower pressure. 
C) in the direction of lower energies. 
D) all of the above 
E) none of the above 
A) undiminished to all points in the fluid. 
B) to points of lower pressure. 
C) in the direction of lower energies. 
D) all of the above 
E) none of the above

Question 6

The buoyant force on an object is less when the object is

Accepted Answer

A) only partly submerged. 
B) submerged near the surface. 
C) submerged near the bottom. 
D) none of the above 
A) only partly submerged. 
B) submerged near the surface. 
C) submerged near the bottom. 
D) none of the above

Question 7

There is a legend of a Dutch boy who bravely held back the Atlantic Ocean by plugging a leak near the top of a dike with his finger until help arrived.Which of the following is most likely?

Accepted Answer

A) The huge size of the Atlantic Ocean makes this impossible. 
B) The force on his finger would be huge but the pressure small enough. 
C) The force on his finger would have been less than 1 N. 
D) Both the force and pressure on his finger would have been huge. 
E) none of the above 
A) The huge size of the Atlantic Ocean makes this impossible. 
B) The force on his finger would be huge but the pressure small enough. 
C) The force on his finger would have been less than 1 N. 
D) Both the force and pressure on his finger would have been huge. 
E) none of the above

Question 8

A block of Styrofoam floats on water while a same-size lead block lies submerged in the water.The buoyant force is greatest on the

Accepted Answer

A) lead. 
B) Styrofoam. 
C) same for both 
A) lead. 
B) Styrofoam. 
C) same for both

Question 9

A bubble of air released from the bottom of a lake

Accepted Answer

A) rises to the top at constant volume. 
B) becomes smaller as it rises. 
C) becomes larger as it rises. 
D) alternately expands and contracts as it rises. 
E) none of the above 
A) rises to the top at constant volume. 
B) becomes smaller as it rises. 
C) becomes larger as it rises. 
D) alternately expands and contracts as it rises. 
E) none of the above

Question 10

A boat loaded with wood floats in a swimming pool.When the wood is thrown overboard,the pool level

Accepted Answer

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

Question 11

What is the approximate mass of a 1-cm2 column of air that extends from sea level to the top of the atmosphere?

Accepted Answer

A) 1 g 
B) 1 kg 
C) 10 kg 
D) 100 kg 
A) 1 g 
B) 1 kg 
C) 10 kg 
D) 100 kg

Question 12

A boat loaded with a barrel of water floats in a swimming pool.When the barrel of water is poured overboard,the pool level

Accepted Answer

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

Question 13

In a hydraulic-press operation,it is impossible for the

Accepted Answer

A) output displacement to exceed the input displacement. 
B) force output to exceed the force input. 
C) energy output to exceed the energy input. 
D) output piston's speed to exceed the input piston's speed. 
E) none of the above 
A) output displacement to exceed the input displacement. 
B) force output to exceed the force input. 
C) energy output to exceed the energy input. 
D) output piston's speed to exceed the input piston's speed. 
E) none of the above

Question 14

Why will a helium-filled balloon rise in air while an air-filled balloon sinks?

Accepted Answer

Both balloons displace air and have a bu

Question 15

Very importantly,a hydraulic press can multiply

Accepted Answer

A) forces. 
B) pressures. 
C) energy. 
D) all of the above 
E) none of the above 
A) forces. 
B) pressures. 
C) energy. 
D) all of the above 
E) none of the above

Question 16

The volume of water displaced by a floating 20-ton boat is

Accepted Answer

A) 20 cubic meters. 
B) the volume of 20 tons of water. 
C) the volume of the boat. 
D) depends on the shape of the ship's hull. 
E) none of the above 
A) 20 cubic meters. 
B) the volume of 20 tons of water. 
C) the volume of the boat. 
D) depends on the shape of the ship's hull. 
E) none of the above

Question 17

The buoyant force that acts on a 10-ton ship floating in the ocean is

Accepted Answer

A) less than 10 tons. 
B) 10 tons. 
C) greater than 10 tons. 
D) depends on the density of seawater 
A) less than 10 tons. 
B) 10 tons. 
C) greater than 10 tons. 
D) depends on the density of seawater

Question 18

A flat piece of iron is tightly tied against top of a wooden block.The iron-wood block floats in a bucket of water.If the iron-wood block flips over so the iron is on the bottom,the water level at the side of the bucket

Accepted Answer

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

Question 19

The tarp covering on a trailer or truck puffs upward for fast-moving vehicles,which illustrates

Accepted Answer

A) Pascal's principle. 
B) Archimedes' principle. 
C) the principle of continuity. 
D) Bernoulli's principle. 
A) Pascal's principle. 
B) Archimedes' principle. 
C) the principle of continuity. 
D) Bernoulli's principle.

Question 20

Why is an umbrella in danger of being turned inside out on a windy day?

Accepted Answer

Because of the umbrella's curvature,air

Exam 5: Fluid Mechanics

If a pressure of 20 kPa is applied to one piston in a simple hydraulic device,the pressure on a piston of larger area will be

When gas in a container expands to three times its volume at constant temperature,the gas pressure

When a gas in a container expands to twice its volume,with no change in temperature,its density

Buoyant force acts upward on a submerged object because

A change in pressure at any point in a confined fluid at rest is transmitted

The buoyant force on an object is less when the object is

There is a legend of a Dutch boy who bravely held back the Atlantic Ocean by plugging a leak near the top of a dike with his finger until help arrived.Which of the following is most likely?

A block of Styrofoam floats on water while a same-size lead block lies submerged in the water.The buoyant force is greatest on the

A bubble of air released from the bottom of a lake

A boat loaded with wood floats in a swimming pool.When the wood is thrown overboard,the pool level

What is the approximate mass of a 1-cm2 column of air that extends from sea level to the top of the atmosphere?

A boat loaded with a barrel of water floats in a swimming pool.When the barrel of water is poured overboard,the pool level

In a hydraulic-press operation,it is impossible for the

Why will a helium-filled balloon rise in air while an air-filled balloon sinks?

Very importantly,a hydraulic press can multiply

The volume of water displaced by a floating 20-ton boat is

The buoyant force that acts on a 10-ton ship floating in the ocean is

A flat piece of iron is tightly tied against top of a wooden block.The iron-wood block floats in a bucket of water.If the iron-wood block flips over so the iron is on the bottom,the water level at the side of the bucket

The tarp covering on a trailer or truck puffs upward for fast-moving vehicles,which illustrates

Why is an umbrella in danger of being turned inside out on a windy day?

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

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What is the approximate mass of a 1-cm² column of air that extends from sea level to the top of the atmosphere?