Cracking The AP Physics 1 Exam

Robert Franek

Chapter 14

Practice Test 4 - all with Video Answers

Educators

Chapter Questions

Problem 1

Questions 1-3 refer to the following scenario:
IMAGE IS NOT AVAILABLE TO COPY
An explorer travels 30 $\mathrm{m}$ east, then 20$\sqrt{2} \mathrm{m}$ in a direction $45^{\circ}$ south of east, and then 140 $\mathrm{m}$ north.
What is the distance traveled by the explorer?
(A) 167.2 $\mathrm{m}$
(B) 169 $\mathrm{m}$
(C) 170 $\mathrm{m}$
(D) 198.2 $\mathrm{m}$

Sachin Rao

Sachin Rao

Numerade Educator

Problem 1

Questions 1, 2, and 3 are short free-response questions that require about 13 minutes to answer and are worth 8 points. Questions 4 and 5 are long free-response questions that require about 25 minutes each to answer and are worth 13 points each. Show your work for each part in the space provided after that part.
(DIAGRAM IS NOT AVAILABLE TO COPY)
A mass $m_{1}$ traveling with an initial velocity of $v$ has an elastic collision with a mass $m_{2}$ initially at rest.
(a) Determine the final velocity $v_{1}$ of $m_{1}$ in terms of $m_{1}, m_{2},$ and $v$
(b) Determine the final velocity $v_{2}$ of $m_{2}$ in terms of $m_{1}, m_{2},$ and $v$
(c) For what values of $m_{1}$ and $m_{2}$ would the final velocities of the two masses be in the same direction? The opposite direction?
(DIAGRAM IS NOT AVAILABLE TO COPY)

Linda Winkler

Numerade Educator

Problem 2

Questions 1-3 refer to the following scenario:
IMAGE IS NOT AVAILABLE TO COPY
An explorer travels 30 $\mathrm{m}$ east, then 20$\sqrt{2} \mathrm{m}$ in a direction $45^{\circ}$ south of east, and then 140 $\mathrm{m}$ north.
What is the displacement of the explorer?
(A) 130 $\mathrm{m}$
(B) 169 $\mathrm{m}$
(C) 170 $\mathrm{m}$
(D) 215 $\mathrm{m}$

Sachin Rao

Numerade Educator

Problem 2

Questions 1, 2, and 3 are short free-response questions that require about 13 minutes to answer and are worth 8 points. Questions 4 and 5 are long free-response questions that require about 25 minutes each to answer and are worth 13 points each. Show your work for each part in the space provided after that part.
(DIAGRAM IS NOT AVAILABLE TO COPY)
Two charges, $q_{1}=+3 \mathrm{n} \mathrm{C}$ and $q_{2}=-12 \mathrm{nC}$ , are fixed in place and separated by a distance of 3 $\mathrm{cm} .$
(a) What is the magnitude of the electric force between the two charges? Is the force attractive or repulsive?
(b) At what point between the two charges is the electric field equal to 0?
(c) What is the electric field at the midpoint between the two charges?
(d) What is the magnitude of the electric force on a charge $q_{3}=+2 \mathrm{nC}$ placed in the middle of the two charges?

Linda Winkler

Numerade Educator

Problem 3

Questions 1-3 refer to the following scenario:
IMAGE IS NOT AVAILABLE TO COPY
An explorer travels 30 $\mathrm{m}$ east, then 20$\sqrt{2} \mathrm{m}$ in a direction $45^{\circ}$ south of east, and then 140 $\mathrm{m}$ north.
The explorer took $60 \mathrm{s}, 130 \mathrm{s}$ , and 70 $\mathrm{s}$ to travel the $30 \mathrm{m}, 2 \mathrm{O} \sqrt{2} \mathrm{m},$ and 140 $\mathrm{m}$ north distances, respectively. What is the average velocity of the explorer over the total distance traveled?
(A) 0.50 $\mathrm{m} / \mathrm{s}$
(B) 33.3 $\mathrm{m} / \mathrm{min}$
(C) 0.76 $\mathrm{m} / \mathrm{s}$
(D) 100 $\mathrm{m} / \mathrm{min}$

Sachin Rao

Numerade Educator

Problem 3

Questions 1, 2, and 3 are short free-response questions that require about 13 minutes to answer and are worth 8 points. Questions 4 and 5 are long free-response questions that require about 25 minutes each to answer and are worth 13 points each. Show your work for each part in the space provided after that part.
(DIAGRAM IS NOT AVAILABLE TO COPY)
A horizontal spring with a force constant of 40 $\mathrm{N} / \mathrm{m}$ is attached a 0.1 $\mathrm{kg}$ block.
(a) If the block is pulled to a distance of 0.5 m and released, what is the maximum speed of the block?
(b) What is the frequency of the oscillations?
(c) If the spring were flipped vertically and attached to the ground with the block placed on top, how would the natural length of the spring change?
(d) How does the frequency of the oscillations of the vertical spring block oscillator compare with that when it was placed horizontally?

Linda Winkler

Numerade Educator

Problem 4

Questions 1, 2, and 3 are short free-response questions that require about 13 minutes to answer and are worth 8 points. Questions 4 and 5 are long free-response questions that require about 25 minutes each to answer and are worth 13 points each. Show your work for each part in the space provided after that part.
(DIAGRAM IS NOT AVAILABLE TO COPY)
A massless tray is placed on an inclined plane with an angle of incline of $\theta$ There is a coefficient of static friction $\mu_{\mathrm{s}}$ between the inclined plane and the massless tray. The tray is attached to a box of mass $M$ by the pulley system shown below.
(DIAGRAM IS NOT AVAILABLE TO COPY)
(a) If mass can loaded onto the massless tray, how much mass $m$ has to be loaded to stop the tray from being pulled up the inclined plane by $M ?$
(b) How much mass $m$ has to be loaded until the tray starts sliding down the inclined plane?
(c) If $\mu_{\mathrm{k}}=0.3$ and $\theta=45^{\circ},$ what is the acceleration of the massless tray if $m=4 M ?$

Linda Winkler

Numerade Educator

Problem 4

The graph above is the position-versus-time graph of an object. Which of the following is the velocity-versus-time graph of the object?
IMAGE IS NOT AVAILABLE TO COPY

Pritesh Ranjan

Numerade Educator

Problem 5

Questions 1, 2, and 3 are short free-response questions that require about 13 minutes to answer and are worth 8 points. Questions 4 and 5 are long free-response questions that require about 25 minutes each to answer and are worth 13 points each. Show your work for each part in the space provided after that part.
(DIAGRAM IS NOT AVAILABLE TO COPY)
A machine launches a 2 $\mathrm{kg}$ ball to the right with an initial velocity 16 $\mathrm{m} / \mathrm{s}$ at a launched angle of $30^{\circ}$ to a student standing 20 $\mathrm{m}$ away with a baseball bat.
(DIAGRAM IS NOT AVAILABLE TO COPY)
(a) What height must the student swing the bat to hit the ball?
(b) What is the magnitude of the velocity of the ball just before impact?
(c) If the student hits the ball with an upwards vertical velocity of 5 h/s and horizontal velocity of 12 $\mathrm{m} / \mathrm{s}$ to the left, what are the horizontal and vertical components of the impulse of the ball from the collision?
(d) If the impact time with the bat was 0.05 s, what is the magnitude of the average force experienced by the ball during impact?
(e) What is the direction of the average force experienced by the ball during impact?

Linda Winkler

Numerade Educator

Problem 5

In which section of the following velocity-time graph is the object slowing down and moving in the negative direction?
IMAGE IS NOT AVAILABLE TO COPY
(A) Section 1
(B) Section 2
(C) Section 3
(D) Section 4

Pritesh Ranjan

Numerade Educator

Problem 6

Which of the following is true statement regarding the motion of projectiles?
(A) All projectiles have zero velocity at the apex of the trajectory.
(B) The velocity of projectiles is smallest at the apex of the trajectory.
(C) The acceleration of projectiles is greatest at the apex of the trajectory.
(D) Projectiles have maximum kinetic energy at the apex of the trajectory.

Sachin Rao

Numerade Educator

Problem 7

A cannonball is fired with an initial velocity of 20 $\mathrm{m} / \mathrm{s}$ and a launch angle of $45^{\circ}$ at a wall 30 $\mathrm{m}$ away. If the cannonball just barely clears the wall, what is the maximum height of the wall?
(A) 5.92 $\mathrm{m}$
(B) 6.34 $\mathrm{m}$
(C) 7.51 $\mathrm{m}$
(D) 8.32 $\mathrm{m}$

Sachin Rao

Numerade Educator

Problem 8

A car initially at rest accelerates linearly at a constant rate for 5 s. If the final speed of the car is 15 m/s, what was the acceleration of the car?
(A) 50 $\mathrm{m}$
(B) 100 $\mathrm{m}$
(C) 150 $\mathrm{m}$
(D) 200 $\mathrm{m}$

Sachin Rao

Numerade Educator

Problem 9

A rocket is launched into the air. A few moments after liftoff, the rocket is 40 $\mathrm{m}$ above the ground. After another 5 $\mathrm{s}$ , the rocket is now 200 $\mathrm{m}$ off the ground. What is the average velocity of the rocket during the 5 s part of the flight?
(A) 16 $\mathrm{m} / \mathrm{s}$
(B) 32 $\mathrm{m} / \mathrm{s}$
(C) 48 $\mathrm{m} / \mathrm{s}$
(D) 64 $\mathrm{m} / \mathrm{s}$

Sachin Rao

Numerade Educator

Problem 10

A student presses a 0.5 $\mathrm{kg}$ book against the wall. If the $\mu_{\mathrm{s}}$ between the book and the wall is $0.2,$ what force must the student apply to hold the book in place?
(A) 0 $\mathrm{N}$
(B) 15 $\mathrm{N}$
(C) 25 $\mathrm{N}$
(D) 35 $\mathrm{N}$

Sachin Rao

Numerade Educator

Problem 11

A box with a mass of 10 $\mathrm{kg}$ is placed on an inclined plane that makes a $60^{\circ}$ angle with the horizontal. The coefficient of static fraction $\left(\mu_{\mathrm{s}}\right)$ between the box and the inclined plane is $0.2 .$ What force must be applied on the box in order to prevent the box from sliding down the inclined plane?
(A) 32.7 $\mathrm{N}$
(B) 48.3 $\mathrm{N}$
(C) 56.2 $\mathrm{N}$
(D) 76.6 $\mathrm{N}$

Sachin Rao

Numerade Educator

Problem 12

A 2000 kg car has a head-on collision with a 1000 kg car. How does the impact force force on the heavier car compare with that of the smaller car?
(A) The heavier car experiences a greater impact force.
(B) The smaller car experiences a greater impact force.
(C) Both vehicles experience an impact force with the same magnitude.
(D) Cannot be determined

Sachin Rao

Numerade Educator

Problem 13

Two students push two different boxes across a frictionless floor. Both students exert a horizontal force of 50 $\mathrm{N}$ . If the first box has mass $m_{1}=$ 10 $\mathrm{kg}$ and the second box has mass $m_{2}=40 \mathrm{kg}$ , what is the value of $a_{1} / a_{2} ?$
(A) 1/4
(B) 1/2
(C) 2
(D) 4

Sachin Rao

Numerade Educator

Problem 14

A 4 $\mathrm{kg}$ box is accelerated upwards by a string with a breaking strength of 80 $\mathrm{N}$ . What is the maximum upward acceleration that can be applied on the box without breaking the string?
(A) 2.5 $\mathrm{m} / \mathrm{s}^{2}$
(B) 5.0 $\mathrm{m} / \mathrm{s}^{2}$
(C) 7.5 $\mathrm{m} / \mathrm{s}^{2}$
(D) 10 $\mathrm{m} / \mathrm{s}^{2}$

Sachin Rao

Numerade Educator

Problem 15

A worker moves a 30 $\mathrm{kg}$ box by pulling on it with a rope that makes a $60^{\circ}$ angle with the horizontal. If the worker applies a force of 40 $\mathrm{N}$ and pulls the box over a distance of $20 \mathrm{m},$ how much work did the worker do?
(A) 100 $\mathrm{J}$
(B) 200 $\mathrm{J}$
(C) 400 $\mathrm{J}$
(D) 800 $\mathrm{J}$

Sachin Rao

Numerade Educator

Problem 16

A 2 kg rock is dropped off a cliff with a height of 20 $\mathrm{m} .$ What the speed of the rock at the bottom of the hill?
(A) 10 $\mathrm{m} / \mathrm{s}$
(B) 14 $\mathrm{m} / \mathrm{s}$
(C) 20 $\mathrm{m} / \mathrm{s}$
(D) 40 $\mathrm{m} / \mathrm{s}$

Sachin Rao

Numerade Educator

Problem 17

How much work is done by a pitcher in throwing a 0.2 $\mathrm{kg}$ ball at a speed of 30 $\mathrm{m} / \mathrm{s}$ ?
(A) 3 $\mathrm{J}$
(B) 9 $\mathrm{J}$
(C) 30 $\mathrm{J}$
(D) 90 $\mathrm{J}$

Sachin Rao

Numerade Educator

Problem 18

A 10 $\mathrm{kg}$ block is placed at the top of an inclined plane with an angle of incline of $30^{\circ}$ and $\mu_{\mathrm{k}}=0.1$ . If the height of the inclined plane is $2 \mathrm{m},$ what is the kinetic energy of the block when it is halfway down the incline?
(A) 64 $\mathrm{J}$
(B) 72 $\mathrm{J}$
(C) 92 $\mathrm{J}$
(D) 100 $\mathrm{J}$

Pritesh Ranjan

Numerade Educator

Problem 19

A car’s engine must exert a force of 2,000 $\mathrm{N}$ to maintain a speed of 30 m/s up an incline. What is the power provided by the engine during this motion?
(A) 20 $\mathrm{N}$
(B) 40 $\mathrm{N}$
(C) 80 $\mathrm{N}$
(D) 160 $\mathrm{N}$

Sachin Rao

Numerade Educator

Problem 20

Questions 20–22 refer to the following scenario:
A 2 $\mathrm{kg}$ ball with a velocity of $-20 \mathrm{m} / \mathrm{s}$ collides with the wall and bounces back with a velocity of 10 $\mathrm{m} / \mathrm{s}$
What is the impulse during the collision?
(A) 10 $\mathrm{N} \cdot \mathrm{s}$.
(B) 20 $\mathrm{N} \cdot \mathrm{s}$
(C) 30 $\mathrm{N} \cdot \mathrm{s}$ .
(D) 60 $\mathrm{N} \cdot \mathrm{s}$

Sachin Rao

Numerade Educator

Problem 21

Questions 20–22 refer to the following scenario:
A 2 $\mathrm{kg}$ ball with a velocity of $-20 \mathrm{m} / \mathrm{s}$ collides with the wall and bounces back with a velocity of 10 $\mathrm{m} / \mathrm{s}$
If the ball is in contact with the wall for 0.002 s, determine the average force experienced by the ball.
(A) $3,000 \mathrm{N}$
(B) $5,000 \mathrm{N}$
(C) $30,000 \mathrm{N}$
(D) $50,000 \mathrm{N}$

Sachin Rao

Numerade Educator

Problem 22

Questions 20–22 refer to the following scenario:
A 2 $\mathrm{kg}$ ball with a velocity of $-20 \mathrm{m} / \mathrm{s}$ collides with the wall and bounces back with a velocity of 10 $\mathrm{m} / \mathrm{s}$
How much work did the wall do on the ball?
(A) $-300 \mathrm{J}$
(B) $-400 \mathrm{J}$
(C) $-750 \mathrm{J}$
(D) $-1,000 \mathrm{J}$

Sachin Rao

Numerade Educator

Problem 23

A student pushes a 6 kg box up an inclined plane with a height of 10 m. How much work does gravity do on the box during this process?
$(\mathrm{A})-1,200 \mathrm{J}$
(B) $-600 \mathrm{J}$
(C) 600 $\mathrm{J}$
(D) $1,200 \mathrm{J}$

Sachin Rao

Numerade Educator

Problem 24

A 2 kg ball traveling to the right at 6 $\mathrm{m} / \mathrm{s}$ collides head on with a 1 $\mathrm{kg}$ ball at rest. After impact, the 2 $\mathrm{kg}$ ball is traveling to the right at 2 $\mathrm{m} / \mathrm{s}$ and the 1 $\mathrm{kg}$ ball is traveling to the right at 8 $\mathrm{m} / \mathrm{s} .$ What type of collision occurred?
(A) Inelastic
(B) Perfectly inelastic
(C) Elastic
(D) Cannot be determined

Sachin Rao

Numerade Educator

Problem 25

A 3 kg mass with a initial velocity of $+3 \mathrm{m} / \mathrm{s}$ has a perfectly inelastic collision with a 2 $\mathrm{kg}$ mass with an initial velocity of $-6 \mathrm{m} / \mathrm{s} .$ What is the final velocity after impact?
(A) $-1.0 \mathrm{m} / \mathrm{s}$
(B) $-0.6 \mathrm{m} / \mathrm{s}$
(C) 0.6 $\mathrm{m} / \mathrm{s}$
(D) 1.0 $\mathrm{m} / \mathrm{s}$

Sachin Rao

Numerade Educator

Problem 26

A soldier loads a 10 $\mathrm{kg}$ cannonball into a 300 $\mathrm{kg}$ cannon that is initially at rest on the ground. What is the recoil speed of the cannon if the cannonball is fired with a horizontal velocity of 300 $\mathrm{m} / \mathrm{s}$ ?
(A) 5 $\mathrm{m} / \mathrm{s}$
(B) 7.5 $\mathrm{m} / \mathrm{s}$
(C) 10 $\mathrm{m} / \mathrm{s}$
(D) 15 $\mathrm{m} / \mathrm{s}$

Sachin Rao

Numerade Educator

Problem 27

A car is driving on a flat curve with a radius of 50 m. If the coefficient of friction between the ground the car’s tires is 0.8, what is the maximum speed of the car in order to make the curve without sliding?
(A) 8 $\mathrm{m} / \mathrm{s}^{2}$
(B) 12 $\mathrm{m} / \mathrm{s}^{2}$
(C) 16 $\mathrm{m} / \mathrm{s}^{2}$
(D) 20 $\mathrm{m} / \mathrm{s}^{2}$

Sachin Rao

Numerade Educator

Problem 28

If the speed of a satellite orbiting the Earth at a distance r from the center of the Earth is v, what is the speed of a second satellite orbiting the Earth at a distance 2r from the center of the Earth?
(A) 2 $\mathrm{V}$
(B) $\sqrt{2} \mathrm{v}$
(C) $\frac{1}{\sqrt{2}} v$
(D) $\frac{1}{2} v$

Sachin Rao

Numerade Educator

Problem 29

A 50 $\mathrm{kg}$ man stands on a scale that measures force in an elevator traveling up with an acceleration of $g / 4 .$ What will the scale read?
(A) 375 $\mathrm{N}$
(B) 500 $\mathrm{N}$
(C) 575 $\mathrm{N}$
(D) 625 $\mathrm{N}$

Sachin Rao

Numerade Educator

Problem 30

A mechanical wheel initially at rest on the floor begins rolling forward with an angular acceleration of rad/s? If the radius of the wheel is 0.5 $\mathrm{m},$ what is the linear velocity of the wheel after 5 $\mathrm{s}$ ?
(A) 0.5 $\mathrm{m} / \mathrm{s}$
(B) 1 $\mathrm{m} / \mathrm{s}$
(C) 5 $\mathrm{m} / \mathrm{s}$
(D) 10 $\mathrm{m} / \mathrm{s}$

Sachin Rao

Numerade Educator

Problem 31

Two masses are attached to a 1 m long massless bar. Mass 1 is 3 kg and is attached to the far left side of the bar. Mass 2 is 5 kg and is attached to the far right side of the bar. If a third mass that is 2 kg is added to the middle of the bar, how does the center of mass of the system change?
(A) The center of mass shifts to the left by 0.025 m.
(B) The center of mass shifts to the right by 0.025 m.
(C) The center of mass shifts to the left by 0.075 m.
(D) The center of mass shifts to the right by 0.075 m.

Pritesh Ranjan

Numerade Educator

Problem 32

A 5 kg box is connected to a pulley with rope in the diagram shown below. If the radius of the pulley is 0.5 m, what is the torque generated by the box on the pulley?
(A) 10 $\mathrm{N} \cdot \mathrm{m}$
(B) 25 $\mathrm{N} \cdot \mathrm{m}$
(C) 50 $\mathrm{N} \cdot \mathrm{m}$
(D) 75 $\mathrm{N} \cdot \mathrm{m}$

Sachin Rao

Numerade Educator

Problem 33

Which of the following objects has the greatest rotational inertia?
(A) A 1 kg solid ball with radius of 5 cm
(B) A1 kg hollow ball with radius of 5 cm
(C) A 5 kg solid ball with radius of 5 cm
(D) A 5 kg hollow ball with radius 5 cm

Sachin Rao

Numerade Educator

Problem 34

A horizontal spring is attached to a 5 kg block. When the block is pulled 5 cm to the right, the restoring force has a magnitude of 6 N. What is the frequency of the spring?
(A) 0.32 Hz
(B) 0.56 Hz
(C) 0.78 Hz
(D) 0.98 Hz

Sachin Rao

Numerade Educator

Problem 35

A 3 kg block is attached to a horizontal spring with a force constant of 10 N/m. If the maximum speed of the block is 4 m/s, what is the amplitude of the block?
(A) 0.55 m
(B) 1.1 m
(C) 2.2 m
(D) 4.4 m

Sachin Rao

Numerade Educator

Problem 36

A simple pendulum oscillates back and forth with a period of 2 s. What is the length of the string of the pendulum?
(A) 0.25 m
(B) 0.5 m
(C) 1 m
(D) 2 m

Sachin Rao

Numerade Educator

Problem 37

The speed of sound in air is 343 m/s. If the wavelength of a certain sound wave is 20.0 cm, what is its frequency?
(A) 171.5 Hz
(B) 1,715 Hz
(C) 3,430 Hz
(D) 17,150 Hz

Sachin Rao

Numerade Educator

Problem 38

Which of the following is a true statement about standing waves?
(A) Standing waves have zero amplitude at antinodes.
(B) Standing waves have maximum amplitude at nodes.
(C) Complete constructive interference occurs at nodes.
(D) Complete destructive interference occurs at nodes.

Pritesh Ranjan

Numerade Educator

Problem 39

A string of length 2 m that’s fixed at both ends supports a standing wave with a wavelength of 0.8 m. What is the harmonic number of this standing wave?
(A) 3
(B) 4
(C) 5
(D) 6

Pritesh Ranjan

Numerade Educator

Problem 40

What is the frequency of the third harmonic standing wave in an open tube with a length of 0.5 m? The speed of sound in the tube is 343 m/s.
(A) 514.5 Hz
(B) 1029 Hz
(C) 2058 Hz
(D) 4116 Hz

Sachin Rao

Numerade Educator

Problem 41

What happens to the magnitude of the electric force between two opposite charges if the magnitude of each charge is halved and the distance between their centers is halved?
(A) It is doubled.
(B) It is quadrupled.
(C) It is halved.
(D) It remains the same.

Sachin Rao

Numerade Educator

Problem 42

As a train approaches the next stop, the conductor blows the horn and applies the breaks on the train. What will a person standing at the train stop hear as the train approaches?
(A) A decrease in the frequency and an increase in the intensity of the horn
(B) An increase in the frequency and a decrease in the intensity of the horn
(C) A decrease in both the frequency and intensity of the horn
(D) An increase in both the frequency and intensity of the horn

Sachin Rao

Numerade Educator

Problem 43

A plane traveling at half the speed of sound flies toward a stationary sound source emitting sound waves with wavelength $\lambda$ . What is the wavelength of the waves as the plane receives them?
(A) $\frac{1}{2} \lambda$
(B) $\frac{2}{3} \lambda$
(C) $\frac{3}{2} \lambda$
(D) 2$\lambda$

Pritesh Ranjan

Numerade Educator

Problem 44

Questions 44–45 refer to the following circuit below:
IMAGE IS NOT AVAILABLE TO COPY
What is the total resistance of the circuit?
(A) 13$\Omega$
(B) 11$\Omega$
(C) 8$\Omega$
(D) 6$\Omega$

Pritesh Ranjan

Numerade Educator

Problem 45

Questions 44–45 refer to the following circuit below:
IMAGE IS NOT AVAILABLE TO COPY
How long will it take for the battery to deliver 300 $\mathrm{J}$ of energy to the circuit?
(A) 6 $\mathrm{s}$
(B) 12 $\mathrm{s}$
(C) 18 $\mathrm{s}$
(D) 24 $\mathrm{s}$

Pritesh Ranjan

Numerade Educator

Problem 46

Directions: For each of the questions 46-50, two of the suggested answers will be correct. Select the two answers that are best in each case, and then fill in both of the corresponding circles on the answer sheet.
IMAGE IS NOT AVAILABLE TO COPY
The graph above is the position-versus-time graph of an object. Which of the following is true regarding the motion of the object? Select two answers.
(A) The object is moving in the positive direction.
(B) The object is moving in the negative direction.
(C) The acceleration of the object is decreasing
(D) The speed of the object is decreasing

Pritesh Ranjan

Numerade Educator

Problem 47

Directions: For each of the questions 46-50, two of the suggested answers will be correct. Select the two answers that are best in each case, and then fill in both of the corresponding circles on the answer sheet.
IMAGE IS NOT AVAILABLE TO COPY
When a light wave passes from air into water, what properties of the wave change? Select two answers.
(A) Frequency
(B) Energy
(C) Wavelength
(D) Speed

Pritesh Ranjan

Numerade Educator

Problem 48

Directions: For each of the questions 46-50, two of the suggested answers will be correct. Select the two answers that are best in each case, and then fill in both of the corresponding circles on the answer sheet.
IMAGE IS NOT AVAILABLE TO COPY
Which of the following statements is true regarding an object undergoing uniform circular motion? Select two answers.
(A) The velocity of the object must be constant.
(B) The speed of the object must be constant.
(C) The acceleration of the object must point away from the center of the circle.
(D) The acceleration of the object must point toward center of the circle.

Pritesh Ranjan

Numerade Educator

Problem 49

Directions: For each of the questions 46-50, two of the suggested answers will be correct. Select the two answers that are best in each case, and then fill in both of the corresponding circles on the answer sheet.
IMAGE IS NOT AVAILABLE TO COPY
Which of the following is true regarding conservative forces? Select two answers.
(A) The work done by conservative forces is path dependent.
(B) The work done by conservative forces is path independent.
(C) Gravity is a conservative force.
(D) Friction is a conservative force.

Pritesh Ranjan

Numerade Educator

Problem 50

Directions: For each of the questions 46-50, two of the suggested answers will be correct. Select the two answers that are best in each case, and then fill in both of the corresponding circles on the answer sheet.
IMAGE IS NOT AVAILABLE TO COPY
What does the speed of a wave depend on? Select two answers.
(A) The energy of the wave
(B) The frequency of the wave
(C) The type of wave
(D) The characteristics of the medium

Pritesh Ranjan

Numerade Educator