Question 1

An ice cube that contains small pieces of iron floats on water. When the ice melts, the water level

Accepted Answer

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

Question 2

We know that any body more dense than water will sink in water. Why?

Accepted Answer

If a body is more dense than water, it w

Question 3

The density of a submarine cruising beneath the ocean surface has the same density as

Accepted Answer

A) a crab. 
B) iron. 
C) a floating submarine. 
D) water. 
E) none of the above 
A) a crab. 
B) iron. 
C) a floating submarine. 
D) water. 
E) none of the above

Question 4

In a vacuum, a marshmallow becomes

Accepted Answer

A) larger. 
B) smaller. 
C) does not change. 
A) larger. 
B) smaller. 
C) does not change.

Question 5

A 1-ton blimp hovers in air. The buoyant force acting on it is

Accepted Answer

A) zero. 
B) 1 ton. 
C) less than 1 ton. 
D) more than 1 ton. 
A) zero. 
B) 1 ton. 
C) less than 1 ton. 
D) more than 1 ton.

Question 6

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) the opposite direction. 
C) either the same or opposite direction. 
A) the same direction. 
B) the opposite direction. 
C) either the same or opposite direction.

Question 7

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

Accepted Answer

A) rise. 
B) fall. 
C) remain unchanged. 
A) rise. 
B) fall. 
C) remain unchanged.

Question 8

A common 5-L metal can will float in air if it is

Accepted Answer

A) evacuated of air. 
B) filled with a very large amount of helium. 
C) thrown high enough into the air. 
D) Nonsense! Unless the can and displaced air weigh the same, the can can't float in air. 
A) evacuated of air. 
B) filled with a very large amount of helium. 
C) thrown high enough into the air. 
D) Nonsense! Unless the can and displaced air weigh the same, the can can't float in air.

Question 9

Compared to the buoyant force on you when floating in fresh water, buoyant force on you when floating in the dense water of the Dead Sea is

Accepted Answer

A) less because volume displacement is less. 
B) more because of the greater density of fluid displaced. 
C) the same. 
A) less because volume displacement is less. 
B) more because of the greater density of fluid displaced. 
C) the same.

Question 10

What is the approximate mass of a 1-square centimeter 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 11

Consider two mercury barometers, one with twice the cross-section area of the other. Mercury in the wider tube will rise

Accepted Answer

A) to the same height as in the narrow tube. 
B) twice as high as mercury in the narrow tube. 
C) four times as high as mercury in the narrow tube. 
D) more than four times as high as in the narrow tube. 
E) none of the above 
A) to the same height as in the narrow tube. 
B) twice as high as mercury in the narrow tube. 
C) four times as high as mercury in the narrow tube. 
D) more than four times as high as in the narrow tube. 
E) none of the above

Question 12

The pair of water-filled caissons of the Falkirk Wheel have equal weights when

Accepted Answer

A) they carry equal-weight floating boats. 
B) one carries a heavy floating boat and the other only water. 
C) they carry unequal weights of floating boats. 
D) all of the above 
E) none of the above 
A) they carry equal-weight floating boats. 
B) one carries a heavy floating boat and the other only water. 
C) they carry unequal weights of floating boats. 
D) all of the above 
E) 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) does not affect atmospheric pressure there. 
A) increases atmospheric pressure there. 
B) decreases atmospheric pressure there. 
C) does not affect atmospheric pressure there.

Question 14

How high can water be theoretically lifted by a vacuum pump at sea level?

Accepted Answer

A) less than 10.3 m 
B) 10.3 m 
C) more than 10.3 m 
A) less than 10.3 m 
B) 10.3 m 
C) more than 10.3 m

Question 15

Clearly distinguish between pressure and force in the case of weighing yourself on a common bathroom scale.

Accepted Answer

By definition, pressure is the ratio of

Question 16

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 17

The pressure at the bottom of a jug filled with water does NOT depend on

Accepted Answer

A) the acceleration due to gravity. 
B) water density. 
C) the height of the liquid. 
D) surface area of the water. 
E) none of the above 
A) the acceleration due to gravity. 
B) water density. 
C) the height of the liquid. 
D) surface area of the water. 
E) none of the above

Question 18

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 19

Compared to the density of a kilogram of feathers, the density of a kilogram of lead is

Accepted Answer

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

Question 20

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

Accepted Answer

The levels of water in the two Falkirk c

Exam 5: Fluid Mechanics

An ice cube that contains small pieces of iron floats on water. When the ice melts, the water level

We know that any body more dense than water will sink in water. Why?

The density of a submarine cruising beneath the ocean surface has the same density as

In a vacuum, a marshmallow becomes

A 1-ton blimp hovers in air. The buoyant force acting on it is

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

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

A common 5-L metal can will float in air if it is

Compared to the buoyant force on you when floating in fresh water, buoyant force on you when floating in the dense water of the Dead Sea is

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

Consider two mercury barometers, one with twice the cross-section area of the other. Mercury in the wider tube will rise

The pair of water-filled caissons of the Falkirk Wheel have equal weights when

Wind blowing over the top of a hill

How high can water be theoretically lifted by a vacuum pump at sea level?

Clearly distinguish between pressure and force in the case of weighing yourself on a common bathroom scale.

A bubble of air released from the bottom of a lake

The pressure at the bottom of a jug filled with water does NOT depend on

A completely submerged object always displaces its own

Compared to the density of a kilogram of feathers, the density of a kilogram of lead is

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

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 Timereading 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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