Question 1

A bat, flying due east at 2 m/s, emits a shriek that is reflected back to it from an oncoming insect flying directly toward the bat at 4 m/s. The insect is 20 m from the bat at the instant the shriek is emitted. Sound travels 340 m/s in air. After what elapsed time does the bat hear the reflected echo?

Accepted Answer

The answer of A bat, flying due east at 2...

Question 2

Use the Figure 2-14 below to answer the following question(s).
 
-During the first 8 s

Accepted Answer

A)  the acceleration of D is negative. 
B)  C and D are both slowing down. 
C)  C and D have constant velocities. 
D)  C has the same average velocity as D. 
E)  C is slowing down, and D is speeding up.

Question 3

A bullet moving horizontally with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10 cm.
(a) What is the average acceleration of the bullet?
(b) How long does it take to come to rest?

Accepted Answer

The answer of A bullet moving horizontally with a speed...

Question 4

"Big Mike" throws a baseball straight up and it eventually falls back to him. When the ball was at its highest point, what was its velocity and what was its acceleration? (remember to include magnitude and direction)

Accepted Answer

The answer of "Big Mike" throws a baseball straight up...

Question 5

A car was moving 110. km/hour. (a) How long did it take to go 25.5 miles? (b) If it stopped in 35. s, what was its average acceleration (m/s²) as it slowed down?

Accepted Answer

The answer of A car was moving 110. km/hour.
(a) How...

Question 6

The slope of a line connecting two points on a position versus time graph gives

Accepted Answer

A)  instantaneous velocity. 
B)  average acceleration 
C)  average velocity. 
D)  instantaneous acceleration. 
E)  none of the given answers.

Question 7

All of the following are vectors, except

Accepted Answer

A)  force. 
B)  mass. 
C)  velocity. 
D)  displacement. 
E)  acceleration.

Question 8

An object moving under the influence of only gravity is said to be in ________ ________.

Accepted Answer

The answer of An object moving under the influence of...

Question 9

A race car circles 10 times around an 8-km track in 20 min. What is its average speed per lap?

Accepted Answer

The answer of A race car circles 10 times around...

Question 10

Which of the following can never be negative?

Accepted Answer

A)  average velocity 
B)  displacement 
C)  instantaneous velocity 
D)  instantaneous speed 
E)  acceleration of gravity

Question 11

Barbara travels 20. km Northward, then travels 40. km Eastward, then continues for 50. km in a Southward direction. What displacement will now take her back to her initial position?

Accepted Answer

A)  40. km Westward + 30. km Northward 
B)  30. km Westward + 40. km Northward 
C)  40. km Eastward + 30. km Southward 
D)  50. km Northwest 
E)  30. km Northward + 30. km Westward

Question 12

Speed is to velocity as distance is to ________.

Accepted Answer

A)  displacement 
B)  acceleration 
C)  magnitude 
D)  temperature 
E)  direction

Question 13

-Figure 2-15 shows the velocity-versus-time graph for a basketball player traveling up and down the court in a straight-line path. Find the net displacement of the player for the 10 s shown on the graph.

Accepted Answer

A)  18 m 
B)  16 m 
C)  14 m 
D)  20 m 
E)  12 m

Question 14

The graph in Figure 2-5 plots the velocity of two cars (A and B) along the same straight road.
Figure 2-5

During the time interval shown, which car is AHEAD?

Accepted Answer

A)  Car A 
B)  Car B 
C)  insufficient information

Question 15

A ball is thrown straight up and returns to its starting point under an acceleration due to gravity. Which of the following is true?

Accepted Answer

A)  To compare rise and fall times we need to know the mass of the ball. 
B)  It took the same time to rise as it took to fall. 
C)  It took less time to rise than to fall. 
D)  It took longer to rise than to fall.

Question 16

For this problem, assume that the acceleration of gravity is 10 m/s2 downward, and that all friction effects can be neglected. A ball is thrown upward at a velocity of 20 m/s. What is its velocity after 3 s?

Accepted Answer

A)  20 m/s upward 
B)  zero 
C)  10 m/s upward 
D)  10 m/s downward 
E)  20 m/s downward

Question 17

A negative velocity, approaching zero, represents a negative acceleration.

Accepted Answer

A) True 
 B)False

Question 18

Use the Figure 2-12 below to answer the following question(s).
 
-At t = 1 s

Accepted Answer

A)  C and D are both moving. 
B)  C is ahead of D 
C)  C and D are both at rest. 
D)  D is moving, and C is at rest. 
E)  C is moving, and D is at rest.

Question 19

Use the Figure 2-14 below to answer the following question(s).
 
-Based on all the graphical information

Accepted Answer

A)  C and D meet at the same position at t = 8 s. 
B)  not enough information is given to decide if C and D meet. 
C)  C and D will meet at the same position at t = 10 s. 
D)  the acceleration of D is negative. 
E)  C and D will never meet at the same position.

Question 20

A scalar quantity is described by both a magnitude and a direction.

Accepted Answer

A) True 
 B)False

Exam 2: Kinematics: Description of Motion

Use the Figure 2-14 below to answer the following question(s) . -During the first 8 s

A bullet moving horizontally with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10 cm. (a) What is the average acceleration of the bullet? (b) How long does it take to come to rest?

"Big Mike" throws a baseball straight up and it eventually falls back to him. When the ball was at its highest point, what was its velocity and what was its acceleration? (remember to include magnitude and direction)

A car was moving 110. km/hour. (a) How long did it take to go 25.5 miles? (b) If it stopped in 35. s, what was its average acceleration (m/s²) as it slowed down?

The slope of a line connecting two points on a position versus time graph gives

All of the following are vectors, except

An object moving under the influence of only gravity is said to be in .

A race car circles 10 times around an 8-km track in 20 min. What is its average speed per lap?

Which of the following can never be negative?

Barbara travels 20. km Northward, then travels 40. km Eastward, then continues for 50. km in a Southward direction. What displacement will now take her back to her initial position?

Speed is to velocity as distance is to ________.

-Figure 2-15 shows the velocity-versus-time graph for a basketball player traveling up and down the court in a straight-line path. Find the net displacement of the player for the 10 s shown on the graph.

The graph in Figure 2-5 plots the velocity of two cars (A and B) along the same straight road. Figure 2-5 During the time interval shown, which car is AHEAD?

A ball is thrown straight up and returns to its starting point under an acceleration due to gravity. Which of the following is true?

For this problem, assume that the acceleration of gravity is 10 m/s² downward, and that all friction effects can be neglected. A ball is thrown upward at a velocity of 20 m/s. What is its velocity after 3 s?

A negative velocity, approaching zero, represents a negative acceleration.

Use the Figure 2-12 below to answer the following question(s) . -At t = 1 s

Use the Figure 2-14 below to answer the following question(s) . -Based on all the graphical information

A scalar quantity is described by both a magnitude and a direction.

Exam 2: Kinematics: Description of Motion

Use the Figure 2-14 below to answer the following question(s) . -During the first 8 s

A bullet moving horizontally with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10 cm. (a) What is the average acceleration of the bullet? (b) How long does it take to come to rest?

"Big Mike" throws a baseball straight up and it eventually falls back to him. When the ball was at its highest point, what was its velocity and what was its acceleration? (remember to include magnitude and direction)

A car was moving 110. km/hour. (a) How long did it take to go 25.5 miles? (b) If it stopped in 35. s, what was its average acceleration (m/s2) as it slowed down?

The slope of a line connecting two points on a position versus time graph gives

All of the following are vectors, except

An object moving under the influence of only gravity is said to be in ________ ________.

A race car circles 10 times around an 8-km track in 20 min. What is its average speed per lap?

Which of the following can never be negative?

Barbara travels 20. km Northward, then travels 40. km Eastward, then continues for 50. km in a Southward direction. What displacement will now take her back to her initial position?

Speed is to velocity as distance is to ________.

-Figure 2-15 shows the velocity-versus-time graph for a basketball player traveling up and down the court in a straight-line path. Find the net displacement of the player for the 10 s shown on the graph.

The graph in Figure 2-5 plots the velocity of two cars (A and B) along the same straight road. Figure 2-5 During the time interval shown, which car is AHEAD?

A ball is thrown straight up and returns to its starting point under an acceleration due to gravity. Which of the following is true?

For this problem, assume that the acceleration of gravity is 10 m/s2 downward, and that all friction effects can be neglected. A ball is thrown upward at a velocity of 20 m/s. What is its velocity after 3 s?

A negative velocity, approaching zero, represents a negative acceleration.

Use the Figure 2-12 below to answer the following question(s) . -At t = 1 s

Use the Figure 2-14 below to answer the following question(s) . -Based on all the graphical information

A scalar quantity is described by both a magnitude and a direction.

A car was moving 110. km/hour. (a) How long did it take to go 25.5 miles? (b) If it stopped in 35. s, what was its average acceleration (m/s²) as it slowed down?

An object moving under the influence of only gravity is said to be in .

For this problem, assume that the acceleration of gravity is 10 m/s² downward, and that all friction effects can be neglected. A ball is thrown upward at a velocity of 20 m/s. What is its velocity after 3 s?