Question 1

Explain the significance of the center of gravity.

Accepted Answer

The center of gravity of an object is th...

Question 2

An inelastic collision of two objects is characterized by the following.

Accepted Answer

A)  Total momentum of the system is conserved.
B)  Total energy of the system remains constant.
C)  Total kinetic energy of the system remains constant.
D)  Only A and B are true.
E)  A, B, and C are all true.F) A) and C)
G) A) and B)

Question 3

A 2.00-m rod of negligible mass connects two small objects. The mass of one object is 1.00 kg and the mass of the other is unknown. The center of mass of this system is on the rod a distance 1.80 m from the 1.00-kg mass object. What is the mass of the other object?

Accepted Answer

A)  4.11 kg
B)  3.22 kg
C)  9.00 kg
D)  0.111 kg
E)  0.900 kgF) C) and E)
G) All of the above

Question 4

The impulse delivered to an object is equal to the change in the object's velocity.

Accepted Answer

A) True 
 B)False

Question 5

A long thin rod of length L has a linear density λ(x) = A(L-x)2 where x is the distance from the left end of the rod.
(a) How far is the center of mass of the rod from the left end of the rod?
(b) What is the mass of the rod?

Accepted Answer

Question 6

The change in the momentum vector is in the direction of the net force.

Accepted Answer

A) True 
 B)False

Question 7

A 1000-kg car is traveling north at 20.0 m/s. A 1500-kg car is traveling north at 36.0 m/s. The 1500-kg collides with the rear of the 1000-kg car and they lock together. Ignoring external forces acting during the collision, what is the velocity of the cars immediately after the collision?

Accepted Answer

A)  56.0 m/s north
B)  29.6 m/s north
C)  13.6 m/s south
D)  8.00 m/s south
E)  28.0 m/s northF) B) and C)
G) A) and B)

Question 8

An elastic collision of two objects is characterized by the following.

Accepted Answer

A)  Total momentum of the system is conserved.
B)  Total energy of the system remains constant.
C)  Total kinetic energy of the system remains constant.
D)  Only A and B are true.
E)  A, B, and C are all true.F) A) and B)
G) A) and C)

Question 9

A 320-g air track cart is traveling at 1.25 m/s and a 270-g cart traveling in the opposite direction at 1.33 m/s. What is the speed of the center of mass of the two carts?

Accepted Answer

A)  2.80 m/s
B)  0.0693 m/s
C)  0.131 m/s
D)  1.47 m/s
E)  1.29 m/sF) All of the above
G) A) and B)

Question 10

A novice marksman fires a rifle while holding the butt of the rifle a couple of centimeters away from his shoulder. Explain what happens in terms of the physical principles involved.

Accepted Answer

The initial momentum of the bullet/gun s...

Question 11

A Ping-Pong ball moving east at a speed of 4 m/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision?

Accepted Answer

A)  Neither; both experienced the same magnitude impulse.
B)  the Ping-Pong ball
C)  the bowling ball
D)  It's impossible to tell since the actual mass values are not given.
E)  It's impossible to tell since the velocities after the collision are unknown.F) A) and D)
G) D) and E)

Question 12

The linear momentum of an extended object is the product of the object's mass and the velocity of its center of mass.

Accepted Answer

A) True 
 B)False

Question 13

A 2.00-kg mass object traveling east at 20.0 m/s collides with a 3.00-kg mass object traveling west at 10.0 m/s. After the collision, the 2.00-kg mass has a velocity 5.00 m/s to the west. How much kinetic energy was lost during the collision?

Accepted Answer

A)  (0.00 J ) 
B)  458 J
C)  516 J
D)  (91.7 J ) 
E)  175 JF) A) and B)
G) B) and C)

Question 14

An interacting system of two objects has no external force acting on the system. The first object has a mass 2.00 kg and is moving with a velocity (2.00 m/s)  + (1.00 m/s)  at time t = 0.00 s. The second object has a mass 3.00 kg and is moving with a velocity (-1.00 m/s)  + (1.00 m/s)  at time t = 0.00 s. The second object is moving with a velocity (2.00 m/s)  + (-1.00 m/s)  at time t = 1.00 s.
(a) What is the total momentum of the system at time t = 0.00 s?
(b) What is the velocity of the first object at t = 1.00 s?

Accepted Answer

(a) (1.00 kg∙m/s) <img  loading="lazy" src="/assets/images/blured-textbook.svg" class="d-inline m-1" alt="blured image" width="139" height="30"> +...

Question 15

A rocket with a mass of 2.0 × 106 kg is designed to take off from the surface of the earth by burning fuel and ejecting it with an exhaust speed of 3500 m/s. What is the minimum rate at which the fuel should be consumed in order to attain liftoff?

Accepted Answer

A)  5.6 × 103 kg/s
B)  1.4 × 103 kg/s
C)  1.8 × 103 kg/s
D)  2.8 × 103 kg/s
E)  18 × 103 kg/sF) A) and B)
G) B) and C)

Question 16

Define an elastic collision in terms of conservation of momentum and energy.

Accepted Answer

In an elastic collis...

Question 17

At what speed must a 150-kg football player be moving to have the same momentum as a 15.0-g bullet traveling at 300 m/s?

Accepted Answer

A)  10.0 m/s
B)  3.00 cm/s
C)  3.00 m/s
D)  30.0 m/s
E)  1.00 m/sF) None of the above
G) A) and B)

Question 18

Two automobiles traveling at right angles to each other collide and stick together. Car A has a mass of 1200 kg and had a speed of 25 m/s before the collision. Car B has a mass of 1600 kg. The skid marks show that, immediately after the collision, the wreckage was moving in a direction making an angle of 40° with the original direction of car A. What was the speed of car B before the collision?

Accepted Answer

A)  16 m/s
B)  18 m/s
C)  11 m/s
D)  21 m/s
E)  14 m/sF) C) and E)
G) A) and B)

Question 19

If two objects stick together as a result of a collision, the collision is said to be perfectly elastic.

Accepted Answer

A) True 
 B)False

Question 20

A plane, flying horizontally, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just after the explosion

Accepted Answer

A)  is zero.
B)  moves horizontally.
C)  moves vertically.
D)  moves along a parabolic path.E) None of the above
F) All of the above

Exam 9: Linear Momentum

The change in the momentum vector is in the direction of the net force.

Correct Answer
verified

Correct Answer
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(a) (1.00 kg∙m/s) +...
View Answer

A 1000-kg car is traveling north at 20.0 m/s. A 1500-kg car is traveling north at 36.0 m/s. The 1500-kg collides with the rear of the 1000-kg car and they lock together. Ignoring external forces acting during the collision, what is the velocity of the cars immediately after the collision?

Correct Answer
verified

A novice marksman fires a rifle while holding the butt of the rifle a couple of centimeters away from his shoulder. Explain what happens in terms of the physical principles involved.

Correct Answer
verified
The initial momentum of the bullet/gun s...
View Answer

An elastic collision of two objects is characterized by the following.

Correct Answer
verified

A 320-g air track cart is traveling at 1.25 m/s and a 270-g cart traveling in the opposite direction at 1.33 m/s. What is the speed of the center of mass of the two carts?

Correct Answer
verified

A plane, flying horizontally, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just after the explosion

Correct Answer
verified

The linear momentum of an extended object is the product of the object's mass and the velocity of its center of mass.

Correct Answer
verified

A 2.00-m rod of negligible mass connects two small objects. The mass of one object is 1.00 kg and the mass of the other is unknown. The center of mass of this system is on the rod a distance 1.80 m from the 1.00-kg mass object. What is the mass of the other object?

Correct Answer
verified

Define an elastic collision in terms of conservation of momentum and energy.

Correct Answer
verified
In an elastic collis...
View Answer

At what speed must a 150-kg football player be moving to have the same momentum as a 15.0-g bullet traveling at 300 m/s?

Correct Answer
verified

A rocket with a mass of 2.0 × 10⁶ kg is designed to take off from the surface of the earth by burning fuel and ejecting it with an exhaust speed of 3500 m/s. What is the minimum rate at which the fuel should be consumed in order to attain liftoff?

Correct Answer
verified

A 2.00-kg mass object traveling east at 20.0 m/s collides with a 3.00-kg mass object traveling west at 10.0 m/s. After the collision, the 2.00-kg mass has a velocity 5.00 m/s to the west. How much kinetic energy was lost during the collision?

Correct Answer
verified

A long thin rod of length L has a linear density λ(x) = A(L-x⁾² where x is the distance from the left end of the rod. (a) How far is the center of mass of the rod from the left end of the rod? (b) What is the mass of the rod?

Correct Answer
verified

Correct Answer
verified

The impulse delivered to an object is equal to the change in the object's velocity.

Correct Answer
verified

A Ping-Pong ball moving east at a speed of 4 m/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision?

Correct Answer
verified

An inelastic collision of two objects is characterized by the following.

Correct Answer
verified

If two objects stick together as a result of a collision, the collision is said to be perfectly elastic.

Correct Answer
verified

Explain the significance of the center of gravity.

Correct Answer
verified
The center of gravity of an object is th...
View Answer

Exam 9: Linear Momentum

The change in the momentum vector is in the direction of the net force.

Correct AnswerverifiedShow Answer

Correct Answerverified(a) (1.00 kg∙m/s) +...View AnswerShow Answer

A 1000-kg car is traveling north at 20.0 m/s. A 1500-kg car is traveling north at 36.0 m/s. The 1500-kg collides with the rear of the 1000-kg car and they lock together. Ignoring external forces acting during the collision, what is the velocity of the cars immediately after the collision?

Correct AnswerverifiedShow Answer

A novice marksman fires a rifle while holding the butt of the rifle a couple of centimeters away from his shoulder. Explain what happens in terms of the physical principles involved.

Correct AnswerverifiedThe initial momentum of the bullet/gun s...View AnswerShow Answer

An elastic collision of two objects is characterized by the following.

Correct AnswerverifiedShow Answer

A 320-g air track cart is traveling at 1.25 m/s and a 270-g cart traveling in the opposite direction at 1.33 m/s. What is the speed of the center of mass of the two carts?

Correct AnswerverifiedShow Answer

A plane, flying horizontally, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just after the explosion

Correct AnswerverifiedShow Answer

The linear momentum of an extended object is the product of the object's mass and the velocity of its center of mass.

Correct AnswerverifiedShow Answer

A 2.00-m rod of negligible mass connects two small objects. The mass of one object is 1.00 kg and the mass of the other is unknown. The center of mass of this system is on the rod a distance 1.80 m from the 1.00-kg mass object. What is the mass of the other object?

Correct AnswerverifiedShow Answer

Define an elastic collision in terms of conservation of momentum and energy.

Correct AnswerverifiedIn an elastic collis...View AnswerShow Answer

At what speed must a 150-kg football player be moving to have the same momentum as a 15.0-g bullet traveling at 300 m/s?

Correct AnswerverifiedShow Answer

A rocket with a mass of 2.0 × 106 kg is designed to take off from the surface of the earth by burning fuel and ejecting it with an exhaust speed of 3500 m/s. What is the minimum rate at which the fuel should be consumed in order to attain liftoff?

Correct AnswerverifiedShow Answer

A 2.00-kg mass object traveling east at 20.0 m/s collides with a 3.00-kg mass object traveling west at 10.0 m/s. After the collision, the 2.00-kg mass has a velocity 5.00 m/s to the west. How much kinetic energy was lost during the collision?

Correct AnswerverifiedShow Answer

A long thin rod of length L has a linear density λ(x) = A(L-x)2 where x is the distance from the left end of the rod. (a) How far is the center of mass of the rod from the left end of the rod? (b) What is the mass of the rod?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The impulse delivered to an object is equal to the change in the object's velocity.

Correct AnswerverifiedShow Answer

A Ping-Pong ball moving east at a speed of 4 m/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision?

Correct AnswerverifiedShow Answer

An inelastic collision of two objects is characterized by the following.

Correct AnswerverifiedShow Answer

If two objects stick together as a result of a collision, the collision is said to be perfectly elastic.

Correct AnswerverifiedShow Answer

Explain the significance of the center of gravity.

Correct AnswerverifiedThe center of gravity of an object is th...View AnswerShow Answer

Correct Answer
verified

Correct Answer
verified
(a) (1.00 kg∙m/s) +...
View Answer

Correct Answer
verified

Correct Answer
verified
The initial momentum of the bullet/gun s...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
In an elastic collis...
View Answer

Correct Answer
verified

A rocket with a mass of 2.0 × 10⁶ kg is designed to take off from the surface of the earth by burning fuel and ejecting it with an exhaust speed of 3500 m/s. What is the minimum rate at which the fuel should be consumed in order to attain liftoff?

Correct Answer
verified

Correct Answer
verified

A long thin rod of length L has a linear density λ(x) = A(L-x⁾² where x is the distance from the left end of the rod. (a) How far is the center of mass of the rod from the left end of the rod? (b) What is the mass of the rod?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The center of gravity of an object is th...
View Answer