Question 1

If you double the amplitude of a harmonic oscillator, the oscillator's period

Accepted Answer

A)  Decreases by a factor of 2 . 
B)  Decreases by a factor of $\sqrt{2}$. 
C)  Does not change. 
D)  Increases by a factor of $\sqrt{2}$. 
E)  Increases by a factor of 2 .
F) Changes by some other factor (specify). 
A)  Decreases by a factor of 2 . 
B)  Decreases by a factor of $\sqrt{2}$. 
C)  Does not change. 
D)  Increases by a factor of $\sqrt{2}$. 
E)  Increases by a factor of 2 .
F) Changes by some other factor (specify).

Question 2

A given rope will break if its tension exceeds $360 \mathrm{~N}$. Suppose that each of two people can exert a pull of $200 \mathrm{~N}$. Which strategy below can they use to break that rope?

Accepted Answer

A)  They each take an end and pull. 
B)  They tie one end to the wall and both pull on the other. 
C)  They use either of the strategies above. 
D)  They cannot break the rope. 
A)  They each take an end and pull. 
B)  They tie one end to the wall and both pull on the other. 
C)  They use either of the strategies above. 
D)  They cannot break the rope.

Question 3

If we choose our origin to be the hinge in the situation discussed in problem N4T.4, the torque exerted by the lid's weight around the hinge is away from the viewer.

Accepted Answer

A) True 
 B)False

Question 4

Suppose an object is suspended from strings as shown in the diagram below.
  
-Which exerts the largest force on the connecting ring?

Accepted Answer

A)  String A 
B)  String B 
C)  String C 
A)  String A 
B)  String B 
C)  String C

Question 5

A board of mass $m$ lies on the ground. What is the magnitude of the force you would have to exert to lift one end of the board barely off the ground (assuming that the other end still touches the ground)?

Accepted Answer

A)  $2 m|\vec{g}|$ 
B)  $m|\vec{g}|$ 
C)  $1 / 2 m|\vec{g}|$ 
D)  The answer depends on the board's length. 
E)  Other (explain) 
A)  $2 m|\vec{g}|$ 
B)  $m|\vec{g}|$ 
C)  $1 / 2 m|\vec{g}|$ 
D)  The answer depends on the board's length. 
E)  Other (explain)

Question 6

A certain crate sits on a rough floor. You find that you have to apply a horizontal force of $200 \mathrm{~N}$ to get the crate moving. If you put some massive objects in the crate so that its mass is doubled, how much force does it take to get the crate moving now?

Accepted Answer

A)  Still $200 \mathrm{~N}$ 
B)  $400 \mathrm{~N}$ 
C)  $800 \mathrm{~N}$ 
D)  It depends (specify) 
A)  Still $200 \mathrm{~N}$ 
B)  $400 \mathrm{~N}$ 
C)  $800 \mathrm{~N}$ 
D)  It depends (specify)

Question 7

A tennis ball is dropped from rest at the exact same instant and height that a bullet is fired horizontally. Which hits the ground first (ignoring air resistance)?

Accepted Answer

A)  The bullet hits first. 
B)  The ball hits first. 
C)  Both hit at the same time. 
A)  The bullet hits first. 
B)  The ball hits first. 
C)  Both hit at the same time.

Question 8

Kepler's 2nd law applies to hyperbolic orbits.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following pairs of forces are third-law partners? Answer $\mathrm{T}$ if the two forces described are third-law partners, $\mathrm{F}$ if they are not.
-Gravity pulls down on a person sitting in a chair; the chair pushes back up on the person.

Accepted Answer

A) True 
 B)False

Question 10

When viewed from above, suppose that a helicopter's rotor spins clockwise. The helicopter engine must continually exert a torque on the rotor to keep it spinning against the drag that the air exerts on the rotor. Note that a helicopter is usually designed so its center of mass is directly under the rotor. In order for the helicopter to hover motionless in the air, a small rotor at the helicopter's tail is necessary. As viewed by someone looking at the tail from the helicopter's front, the small rotor must blow air

Accepted Answer

A)  To the left. 
B)  To the right. 
C)  Vertically upward. 
D)  Vertically downward. 
E)  In some combination of these directions. 
A)  To the left. 
B)  To the right. 
C)  Vertically upward. 
D)  Vertically downward. 
E)  In some combination of these directions.

Question 11

The diagram below shows a top view of the moon's nearly circular orbit around the earth. The moon orbits the earth at a nearly constant speed.
   
At the point shown, use the arrow choices shown to the right to indicate the direction of
-The net external force on the moon.

Accepted Answer

The answer of The diagram below shows a top view...

Question 12

Do the following statements about the physical world express
-The moon is held in its orbit around the earth by the force of the earth's gravity.
A)a primarily Aristotelian viewpoint .
B)aprimarily Newtonian viewpoint.
C)are they consistent with both viewpoints

Accepted Answer

The answer of Do the following statements about the physical...

Question 13

Suppose the $\mathrm{x}$-position of an oscillating object is given by $x(t)=A \cos (\omega t+\theta)$. What is the object's speed at time $\mathrm{t}=0$ ?

Accepted Answer

Question 14

Centrifugal forces are

Accepted Answer

A)  Real. 
B)  Fictitious. 
C)  Real if we are in a rotating frame. 
A)  Real. 
B)  Fictitious. 
C)  Real if we are in a rotating frame.

Question 15

A spring scale typically indicates the magnitude of the tension force exerted on its bottom hook. What will the scale read in each of the cases shown in the diagram? (Hint: Draw a free-body diagram for the scale in each case.)
-

Accepted Answer

A)  $49 \mathrm{~N}$ 
B)  $98 \mathrm{~N}$ 
C)  $196 \mathrm{~N}$ 
D)  Other (specify) 
A)  $49 \mathrm{~N}$ 
B)  $98 \mathrm{~N}$ 
C)  $196 \mathrm{~N}$ 
D)  Other (specify)

Question 16

A crate is sliding down a $30^{\circ}$ incline, picking up speed as it slides. Ignore air friction.
-(b) Which force has the smallest magnitude?

Accepted Answer

A)  $\left|\vec{F}_{N}\right|$ 
B)  $\left|\vec{F}_{g}\right|$ 
C)  Both $\left|\vec{F}_{N}\right|$ and $\left|\vec{F}_{g}\right|$ (which are equal) 
D)  $\left|\vec{F}_{S F}\right|$ 
E)  $\left|\vec{F}_{K F}\right|$ 
A)  $\left|\vec{F}_{N}\right|$ 
B)  $\left|\vec{F}_{g}\right|$ 
C)  Both $\left|\vec{F}_{N}\right|$ and $\left|\vec{F}_{g}\right|$ (which are equal) 
D)  $\left|\vec{F}_{S F}\right|$ 
E)  $\left|\vec{F}_{K F}\right|$

Question 17

Which one of the arrows below most closely indicates the direction of the bob's acceleration when it is at point 2 ?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E
F) F 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E
F) F

Question 18

A jet airplane flies at a constant velocity through the air. Its jet engines exert a constant force forward on the plane that exactly balances the force of air friction exerted backward on the plane. These forces are equal in magnitude and opposite in direction. Do we know this because of Newton's second law or Newton's third law?

Accepted Answer

A)  Newton's second law 
B)  Newton's third law 
C)  Both laws 
D)  Neither (explain) 
A)  Newton's second law 
B)  Newton's third law 
C)  Both laws 
D)  Neither (explain)

Question 19

Which one of the arrows below most closely indicates the direction of the bob's acceleration when it is at point 3 ?
 
A) A
B) B
D) D
E) E
F) F

Accepted Answer

The answer of  
Which one of the arrows below...

Question 20

An object's $x$-velocity $v_{x}(t)$ is shown in the boxed graph at the top left. Which of the other graphs in the set most correctly describes its $x$-position?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

If you double the amplitude of a harmonic oscillator, the oscillator's period

A given rope will break if its tension exceeds $360 \mathrm{~N}$ . Suppose that each of two people can exert a pull of $200 \mathrm{~N}$ . Which strategy below can they use to break that rope?

If we choose our origin to be the hinge in the situation discussed in problem N4T.4, the torque exerted by the lid's weight around the hinge is away from the viewer.

Suppose an object is suspended from strings as shown in the diagram below. -Which exerts the largest force on the connecting ring?

A board of mass $m$ lies on the ground. What is the magnitude of the force you would have to exert to lift one end of the board barely off the ground (assuming that the other end still touches the ground)?

A certain crate sits on a rough floor. You find that you have to apply a horizontal force of $200 \mathrm{~N}$ to get the crate moving. If you put some massive objects in the crate so that its mass is doubled, how much force does it take to get the crate moving now?

A tennis ball is dropped from rest at the exact same instant and height that a bullet is fired horizontally. Which hits the ground first (ignoring air resistance)?

Kepler's 2nd law applies to hyperbolic orbits.

Which of the following pairs of forces are third-law partners? Answer $\mathrm{T}$ if the two forces described are third-law partners, $\mathrm{F}$ if they are not. -Gravity pulls down on a person sitting in a chair; the chair pushes back up on the person.

The diagram below shows a top view of the moon's nearly circular orbit around the earth. The moon orbits the earth at a nearly constant speed. At the point shown, use the arrow choices shown to the right to indicate the direction of -The net external force on the moon.

Do the following statements about the physical world express -The moon is held in its orbit around the earth by the force of the earth's gravity. A)a primarily Aristotelian viewpoint . B)aprimarily Newtonian viewpoint. C)are they consistent with both viewpoints

Suppose the $\mathrm{x}$ -position of an oscillating object is given by $x(t)=A \cos (\omega t+\theta)$ . What is the object's speed at time $\mathrm{t}=0$ ?

Centrifugal forces are

A spring scale typically indicates the magnitude of the tension force exerted on its bottom hook. What will the scale read in each of the cases shown in the diagram? (Hint: Draw a free-body diagram for the scale in each case.) -

A crate is sliding down a $30^{\circ}$ incline, picking up speed as it slides. Ignore air friction. -(b) Which force has the smallest magnitude?

Which one of the arrows below most closely indicates the direction of the bob's acceleration when it is at point 2 ?

Which one of the arrows below most closely indicates the direction of the bob's acceleration when it is at point 3 ? A) A B) B D) D E) E F) F

Conservation Laws Constrain Interactions

The Laws of Physics Are Frame-Independent Relativity

Electricity and Magnetism Are Unified

Matter Behaves Like Waves Quantum Physics

Some Processes Are Irreversible Thermal Physics

Filters

Exam 2: The Laws of Physics Are Universal Newtonian Mechanics

If you double the amplitude of a harmonic oscillator, the oscillator's period

A given rope will break if its tension exceeds 360 N360 \mathrm{~N}360 N . Suppose that each of two people can exert a pull of 200 N200 \mathrm{~N}200 N . Which strategy below can they use to break that rope?

If we choose our origin to be the hinge in the situation discussed in problem N4T.4, the torque exerted by the lid's weight around the hinge is away from the viewer.

Suppose an object is suspended from strings as shown in the diagram below. -Which exerts the largest force on the connecting ring?

A board of mass mmm lies on the ground. What is the magnitude of the force you would have to exert to lift one end of the board barely off the ground (assuming that the other end still touches the ground)?

A certain crate sits on a rough floor. You find that you have to apply a horizontal force of 200 N200 \mathrm{~N}200 N to get the crate moving. If you put some massive objects in the crate so that its mass is doubled, how much force does it take to get the crate moving now?

A tennis ball is dropped from rest at the exact same instant and height that a bullet is fired horizontally. Which hits the ground first (ignoring air resistance)?

Kepler's 2nd law applies to hyperbolic orbits.

Which of the following pairs of forces are third-law partners? Answer T\mathrm{T}T if the two forces described are third-law partners, F\mathrm{F}F if they are not. -Gravity pulls down on a person sitting in a chair; the chair pushes back up on the person.

The diagram below shows a top view of the moon's nearly circular orbit around the earth. The moon orbits the earth at a nearly constant speed. At the point shown, use the arrow choices shown to the right to indicate the direction of -The net external force on the moon.

Do the following statements about the physical world express -The moon is held in its orbit around the earth by the force of the earth's gravity. A)a primarily Aristotelian viewpoint . B)aprimarily Newtonian viewpoint. C)are they consistent with both viewpoints

Suppose the x\mathrm{x}x -position of an oscillating object is given by x(t)=Acos⁡(ωt+θ)x(t)=A \cos (\omega t+\theta)x(t)=Acos(ωt+θ) . What is the object's speed at time t=0\mathrm{t}=0t=0 ?

Centrifugal forces are

A spring scale typically indicates the magnitude of the tension force exerted on its bottom hook. What will the scale read in each of the cases shown in the diagram? (Hint: Draw a free-body diagram for the scale in each case.) -

A crate is sliding down a 30∘30^{\circ}30∘ incline, picking up speed as it slides. Ignore air friction. -(b) Which force has the smallest magnitude?

Which one of the arrows below most closely indicates the direction of the bob's acceleration when it is at point 2 ?

Which one of the arrows below most closely indicates the direction of the bob's acceleration when it is at point 3 ? A) A B) B D) D E) E F) F

An object's xxx -velocity vx(t)v_{x}(t)vx​(t) is shown in the boxed graph at the top left. Which of the other graphs in the set most correctly describes its xxx -position?

Conservation Laws Constrain Interactions

The Laws of Physics Are Frame-Independent Relativity

Electricity and Magnetism Are Unified

Matter Behaves Like Waves Quantum Physics

Some Processes Are Irreversible Thermal Physics

Filters

A given rope will break if its tension exceeds $360 \mathrm{~N}$ . Suppose that each of two people can exert a pull of $200 \mathrm{~N}$ . Which strategy below can they use to break that rope?

A board of mass $m$ lies on the ground. What is the magnitude of the force you would have to exert to lift one end of the board barely off the ground (assuming that the other end still touches the ground)?

A certain crate sits on a rough floor. You find that you have to apply a horizontal force of $200 \mathrm{~N}$ to get the crate moving. If you put some massive objects in the crate so that its mass is doubled, how much force does it take to get the crate moving now?

Which of the following pairs of forces are third-law partners? Answer $\mathrm{T}$ if the two forces described are third-law partners, $\mathrm{F}$ if they are not. -Gravity pulls down on a person sitting in a chair; the chair pushes back up on the person.

Suppose the $\mathrm{x}$ -position of an oscillating object is given by $x(t)=A \cos (\omega t+\theta)$ . What is the object's speed at time $\mathrm{t}=0$ ?

A crate is sliding down a $30^{\circ}$ incline, picking up speed as it slides. Ignore air friction. -(b) Which force has the smallest magnitude?