Question 1

Flowing honey is less likely to become turbulent than flowing water because

Accepted Answer

A)  honey's large density favors laminar flow. 
B)  water's large viscosity favors turbulent flow. 
C)  water's large pressure favors turbulent flow. 
D)  honey's large viscosity favors laminar flow. 
A)  honey's large density favors laminar flow. 
B)  water's large viscosity favors turbulent flow. 
C)  water's large pressure favors turbulent flow. 
D)  honey's large viscosity favors laminar flow.

Question 2

Suppose that we are able to send astronauts to Mars and they engage in a game of golf on the red planet's surface. Given that the atmosphere on Mars is considerably less dense than our own, how will the path of the ball be affected?

Accepted Answer

A)  There is less drag and gravity, so the ball will go further than if there were air. 
B)  There is less lift, so the ball doesn't go as far than if there were air. 
C)  Less air means lower gravity, so it will go further than if there were air. 
D)  There is no significant effect. 
A)  There is less drag and gravity, so the ball will go further than if there were air. 
B)  There is less lift, so the ball doesn't go as far than if there were air. 
C)  Less air means lower gravity, so it will go further than if there were air. 
D)  There is no significant effect.

Question 3

As the Reynolds number increases,

Accepted Answer

A)  flow is becoming more laminar. 
B)  flow is going from being viscous dominated to inertia dominated and therefore turbulent. 
C)  flow is slowing down. 
D)  flow is speeding up. 
A)  flow is becoming more laminar. 
B)  flow is going from being viscous dominated to inertia dominated and therefore turbulent. 
C)  flow is slowing down. 
D)  flow is speeding up.

Question 4

A curve ball's path bends to the right as it flies toward home plate because it is experiencing an aerodynamic force to its right. One reason why the ball is experiencing this aerodynamic force is that the ball is spinning and that spin

Accepted Answer

A)  causes the air to flow more rapidly around the left side of the ball than around the right side of the ball. 
B)  exerts a torque on the ball that causes its angular momentum to shift toward the left. 
C)  exerts a torque on the ball that causes its angular momentum to shift toward the right. 
D)  causes the air to flow more rapidly around the right side of the ball than around the left side of the ball. 
A)  causes the air to flow more rapidly around the left side of the ball than around the right side of the ball. 
B)  exerts a torque on the ball that causes its angular momentum to shift toward the left. 
C)  exerts a torque on the ball that causes its angular momentum to shift toward the right. 
D)  causes the air to flow more rapidly around the right side of the ball than around the left side of the ball.

Question 5

Why does fuzz on a tennis ball help it travel farther when hit?

Accepted Answer

A)  The fuzz causes turbulence on the leading edge of the ball only. 
B)  The fuzz causes turbulence on the trailing edge of the ball only. 
C)  The fuzz "trips the boundary layer, causing turbulence everywhere around the ball.. 
D)  The fuzz causes laminar flow everywhere. 
A)  The fuzz causes turbulence on the leading edge of the ball only. 
B)  The fuzz causes turbulence on the trailing edge of the ball only. 
C)  The fuzz "trips the boundary layer, causing turbulence everywhere around the ball.. 
D)  The fuzz causes laminar flow everywhere.

Question 6

Tennis ball A is dry and fuzzy. Tennis ball B is wet, and the fuzz is matted down. What will happen when the two balls are hit horizontally so as to have the same initial horizontal velocity?

Accepted Answer

A)  B goes farther than A due to the extra weight of the water. 
B)  B goes farther than A due to the smoother surface. 
C)  A goes farther than B because the fuzz reduces drag. 
D)  Both go the same distance. 
A)  B goes farther than A due to the extra weight of the water. 
B)  B goes farther than A due to the smoother surface. 
C)  A goes farther than B because the fuzz reduces drag. 
D)  Both go the same distance.

Question 7

The reason fast-moving water makes noise is

Accepted Answer

A)  vortices. 
B)  chaos. 
C)  laminar flow. 
D)  turbulence. 
A)  vortices. 
B)  chaos. 
C)  laminar flow. 
D)  turbulence.

Question 8

Suppose you have gotten a new job where you have to design balls that fly through the air with as little resistance as possible. You know that in front of the ball there is laminar flow, so in back of the ball there should be

Accepted Answer

A)  Turbulent flow, because there will be lower density. 
B)  Turbulent flow, because there will be less drag. 
C)  Laminar flow, so the leading and trailing pressure environments are similar. 
D)  No air flow at all. 
A)  Turbulent flow, because there will be lower density. 
B)  Turbulent flow, because there will be less drag. 
C)  Laminar flow, so the leading and trailing pressure environments are similar. 
D)  No air flow at all.

Question 9

When a fluid is in steady - state flow and its path bends, the pressure on the outside of the bend is always

Accepted Answer

A)  Equal to the pressure everywhere else in the fluid. 
B)  Lower than the pressure on the inside of the bend. 
C)  Higher than the pressure on the inside of the bend. 
D)  Darned near infinite. 
A)  Equal to the pressure everywhere else in the fluid. 
B)  Lower than the pressure on the inside of the bend. 
C)  Higher than the pressure on the inside of the bend. 
D)  Darned near infinite.

Question 10

You are caulking a window. The caulk is rather thick and, to lay the bead correctly, the exit nozzle is small. A caulking gun uses a plunger which is operated by pulling back on a handle. You must squeeze the handle very hard to get the caulk to come out of the narrow opening because

Accepted Answer

A)  pressure is distributed uniformly throughout the fluid and the area of the plunger is much larger than the area of the opening. 
B)  viscous drag between the walls of the tip and the caulk causes the caulk to swirl around chaotically. 
C)  Newton's third law requires most of the energy in the caulk to be used to push back on the plunger rather than moving it through the tip. 
D)  the high density of the caulk impedes its flow through the small opening. 
A)  pressure is distributed uniformly throughout the fluid and the area of the plunger is much larger than the area of the opening. 
B)  viscous drag between the walls of the tip and the caulk causes the caulk to swirl around chaotically. 
C)  Newton's third law requires most of the energy in the caulk to be used to push back on the plunger rather than moving it through the tip. 
D)  the high density of the caulk impedes its flow through the small opening.

Question 11

Suppose you are practicing baseball and throw the ball with a spin so that it moves forward and curves to the right. Now when the actual game takes place you are pitching into the wind. Please explain how you could alter your throw so as to make the ball take the same path.

Accepted Answer

Drag resistance is responsible for slowi

Flowing honey is less likely to become turbulent than flowing water because

Suppose that we are able to send astronauts to Mars and they engage in a game of golf on the red planet's surface. Given that the atmosphere on Mars is considerably less dense than our own, how will the path of the ball be affected?

As the Reynolds number increases,

A curve ball's path bends to the right as it flies toward home plate because it is experiencing an aerodynamic force to its right. One reason why the ball is experiencing this aerodynamic force is that the ball is spinning and that spin

Why does fuzz on a tennis ball help it travel farther when hit?

Tennis ball A is dry and fuzzy. Tennis ball B is wet, and the fuzz is matted down. What will happen when the two balls are hit horizontally so as to have the same initial horizontal velocity?

The reason fast-moving water makes noise is

Suppose you have gotten a new job where you have to design balls that fly through the air with as little resistance as possible. You know that in front of the ball there is laminar flow, so in back of the ball there should be

When a fluid is in steady - state flow and its path bends, the pressure on the outside of the bend is always

You are caulking a window. The caulk is rather thick and, to lay the bead correctly, the exit nozzle is small. A caulking gun uses a plunger which is operated by pulling back on a handle. You must squeeze the handle very hard to get the caulk to come out of the narrow opening because

Suppose you are practicing baseball and throw the ball with a spin so that it moves forward and curves to the right. Now when the actual game takes place you are pitching into the wind. Please explain how you could alter your throw so as to make the ball take the same path.

The Laws of Motion, Part 1

The Laws of Motion, Part 2

Mechanical Objects, Part 1

Mechanical Objects, Part 2

Fluids

Heat and Phase Transitions

Thermodynamics

Resonance and Mechanical Waves

Electricity

Magnetism and Electrodynamics

Electromagnetic Waves

Light

Optics and Electronics

Modern Physics

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Exam 6: Fluids and Motion

Flowing honey is less likely to become turbulent than flowing water because

Suppose that we are able to send astronauts to Mars and they engage in a game of golf on the red planet's surface. Given that the atmosphere on Mars is considerably less dense than our own, how will the path of the ball be affected?

As the Reynolds number increases,

A curve ball's path bends to the right as it flies toward home plate because it is experiencing an aerodynamic force to its right. One reason why the ball is experiencing this aerodynamic force is that the ball is spinning and that spin

Why does fuzz on a tennis ball help it travel farther when hit?

Tennis ball A is dry and fuzzy. Tennis ball B is wet, and the fuzz is matted down. What will happen when the two balls are hit horizontally so as to have the same initial horizontal velocity?

The reason fast-moving water makes noise is

Suppose you have gotten a new job where you have to design balls that fly through the air with as little resistance as possible. You know that in front of the ball there is laminar flow, so in back of the ball there should be

When a fluid is in steady - state flow and its path bends, the pressure on the outside of the bend is always

You are caulking a window. The caulk is rather thick and, to lay the bead correctly, the exit nozzle is small. A caulking gun uses a plunger which is operated by pulling back on a handle. You must squeeze the handle very hard to get the caulk to come out of the narrow opening because

Suppose you are practicing baseball and throw the ball with a spin so that it moves forward and curves to the right. Now when the actual game takes place you are pitching into the wind. Please explain how you could alter your throw so as to make the ball take the same path.

The Laws of Motion, Part 1

The Laws of Motion, Part 2

Mechanical Objects, Part 1

Mechanical Objects, Part 2

Fluids

Heat and Phase Transitions

Thermodynamics

Resonance and Mechanical Waves

Electricity

Magnetism and Electrodynamics

Electromagnetic Waves

Light

Optics and Electronics

Modern Physics

Filters