Question 1

If you blow air between a pair of closely-spaced Ping-Pong balls suspended by strings,the balls will swing

Accepted Answer

A) toward each other. 
B) apart from each other. 
C) away from the airstream. 
A) toward each other. 
B) apart from each other. 
C) away from the airstream.

Question 2

When a loaf of bread is compressed,its

Accepted Answer

A) molecules decrease in size. 
B) density decreases. 
C) density increases. 
D) none of the above 
A) molecules decrease in size. 
B) density decreases. 
C) density increases. 
D) none of the above

Question 3

The density of air at room temperature is about 1.2 g/cm3.Estimate the mass of air inside a 0.80-m3 volume refrigerator.(There are 1 million cm3 in 1 m3.)

Accepted Answer

A) 0.96 g 
B) 960 kg 
C) 1000 kg 
D) more than 1000 kg 
A) 0.96 g 
B) 960 kg 
C) 1000 kg 
D) more than 1000 kg

Question 4

The Bernoulli effect causes passing ships to be drawn together when the ships are close and moving in

Accepted Answer

A) the same direction. 
B) opposite directions. 
C) either of these 
D) none of the above 
A) the same direction. 
B) opposite directions. 
C) either of these 
D) none of the above

Question 5

An important underlying feature of hydraulic devices is the conservation of

Accepted Answer

A) pressure. 
B) momentum. 
C) energy. 
D) all of the above 
E) none of the above 
A) pressure. 
B) momentum. 
C) energy. 
D) all of the above 
E) none of the above

Question 6

Your density is slightly greater when you are

Accepted Answer

A) at the top of a mountain. 
B) submerged deep in water. 
C) in a fast-moving vehicle. 
D) none of the above 
A) at the top of a mountain. 
B) submerged deep in water. 
C) in a fast-moving vehicle. 
D) none of the above

Question 7

The product of gas pressure and volume for a given mass of gas is constant

Accepted Answer

A) if the temperature doesn't change. 
B) whether or not the temperature changes. 
C) never. 
D) none of the above 
A) if the temperature doesn't change. 
B) whether or not the temperature changes. 
C) never. 
D) none of the above

Question 8

Ice cubes submerged at the bottom of a liquid mixture indicate that the mixture

Accepted Answer

A) fails to produce a buoyant force on the ice. 
B) has dissolved air in a liquid state. 
C) is composed of open-structured crystals. 
D) is less dense than ice. 
A) fails to produce a buoyant force on the ice. 
B) has dissolved air in a liquid state. 
C) is composed of open-structured crystals. 
D) is less dense than ice.

Question 9

How deep must an inverted drinking glass be pushed beneath the surface of water so that the volume of enclosed air is squeezed to half?

Accepted Answer

A) 76 cm 
B) 10.3 m 
C) 14.7 m 
D) 20.6 m 
E) 29.4 m 
A) 76 cm 
B) 10.3 m 
C) 14.7 m 
D) 20.6 m 
E) 29.4 m

Question 10

The fact that the weight of a brim-full container of water is unchanged whether or not something floats in it is nicely employed in

Accepted Answer

A) hydraulic devices. 
B) all floating devices. 
C) Scotland's Falkirk Wheel. 
D) none of the above 
A) hydraulic devices. 
B) all floating devices. 
C) Scotland's Falkirk Wheel. 
D) none of the above

Question 11

An ice cube floating in a glass of water contains many air bubbles.When the ice melts,the water level

Accepted Answer

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

Question 12

One liter of water has a mass of

Accepted Answer

A) 1 kg. 
B) 1 N. 
C) both of these 
D) none of the above 
A) 1 kg. 
B) 1 N. 
C) both of these 
D) none of the above

Question 13

Wind blowing over the top of a hill

Accepted Answer

A) increases atmospheric pressure there. 
B) decreases atmospheric pressure there. 
C) has no affect on atmospheric pressure there. 
A) increases atmospheric pressure there. 
B) decreases atmospheric pressure there. 
C) has no affect on atmospheric pressure there.

Question 14

Compared with the buoyant force of the atmosphere on a 1-kg helium-filled balloon,the buoyant force of the atmosphere on a nearby 1-kg solid wood block is

Accepted Answer

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

Question 15

A swimmer cannot snorkel more than a meter deep because air

Accepted Answer

A) in the lungs cannot be easily expelled. 
B) tends to liquefy in the snorkel tube. 
C) is buoyed up leaving the swimmer breathless. 
D) at the surface will not freely enter the higher-pressure region in the compressed lungs. 
E) all of the above 
A) in the lungs cannot be easily expelled. 
B) tends to liquefy in the snorkel tube. 
C) is buoyed up leaving the swimmer breathless. 
D) at the surface will not freely enter the higher-pressure region in the compressed lungs. 
E) all of the above

Question 16

Buoyant force is greatest on a submerged

Accepted Answer

A) 1-kg block of lead. 
B) 1-kg block of aluminum. 
C) same on each 
A) 1-kg block of lead. 
B) 1-kg block of aluminum. 
C) same on each

Question 17

An important condition for the operation of the Falkirk Wheel is that

Accepted Answer

A) water in each caisson have the same depth. 
B) ships carried are more or less equal in weight. 
C) no water spill when a ship enters a caisson. 
D) all of the above 
E) none of the above 
A) water in each caisson have the same depth. 
B) ships carried are more or less equal in weight. 
C) no water spill when a ship enters a caisson. 
D) all of the above 
E) none of the above

Question 18

A liter-sized block of wood floats in water.The volume of water displaced is

Accepted Answer

A) less than 1 L. 
B) 1 L. 
C) greater than 1 L. 
D) none of the above 
A) less than 1 L. 
B) 1 L. 
C) greater than 1 L. 
D) none of the above

Question 19

The Bernoulli effect causes fast-moving vans on the highway to be drawn together when

Accepted Answer

A) air speeds up in passing between them. 
B) air between them stagnates. 
C) they experience lift. 
D) all of the above 
A) air speeds up in passing between them. 
B) air between them stagnates. 
C) they experience lift. 
D) all of the above

Question 20

Wood from the Lignum vitae tree in South America is denser than water.Could a boat be made with this wood? A raft? Briefly explain.

Accepted Answer

Yes,a boat could easily be made of this

Exam 5: Fluid Mechanics

If you blow air between a pair of closely-spaced Ping-Pong balls suspended by strings,the balls will swing

When a loaf of bread is compressed,its

The density of air at room temperature is about 1.2 g/cm3.Estimate the mass of air inside a 0.80-m3 volume refrigerator.(There are 1 million cm3 in 1 m3.)

The Bernoulli effect causes passing ships to be drawn together when the ships are close and moving in

An important underlying feature of hydraulic devices is the conservation of

Your density is slightly greater when you are

The product of gas pressure and volume for a given mass of gas is constant

Ice cubes submerged at the bottom of a liquid mixture indicate that the mixture

How deep must an inverted drinking glass be pushed beneath the surface of water so that the volume of enclosed air is squeezed to half?

The fact that the weight of a brim-full container of water is unchanged whether or not something floats in it is nicely employed in

An ice cube floating in a glass of water contains many air bubbles.When the ice melts,the water level

One liter of water has a mass of

Wind blowing over the top of a hill

Compared with the buoyant force of the atmosphere on a 1-kg helium-filled balloon,the buoyant force of the atmosphere on a nearby 1-kg solid wood block is

A swimmer cannot snorkel more than a meter deep because air

Buoyant force is greatest on a submerged

An important condition for the operation of the Falkirk Wheel is that

A liter-sized block of wood floats in water.The volume of water displaced is

The Bernoulli effect causes fast-moving vans on the highway to be drawn together when

Wood from the Lignum vitae tree in South America is denser than water.Could a boat be made with this wood? A raft? Briefly explain.

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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The density of air at room temperature is about 1.2 g/cm³.Estimate the mass of air inside a 0.80-m³volume refrigerator.(There are 1 million cm³ in 1 m³.)