Question 1

Calculate the impulse due to a force of $4.5 \mathrm {~N}$ that lasts for $1.4 \mathrm {~s}$

Accepted Answer

A) 6.3 kg∙ m/s 
B) 5.0 kg∙ m/s 
C) 5.7 kg∙ m/s 
D) 6.9 kg∙ m/s 
A) 6.3 kg∙ m/s 
B) 5.0 kg∙ m/s 
C) 5.7 kg∙ m/s 
D) 6.9 kg∙ m/s

Question 2

A 100-g ball falls from a window that is 12 m above ground level and experiences no significant air resistance as it falls.What is its momentum when it strikes the ground?

Accepted Answer

A) 3.3 kg ∙ m/s 
B) 4.8 kg ∙ m/s 
C) 1.8 kg ∙ m/s 
D) 1.5 kg ∙ m/s 
E) 2.4 kg ∙ m/s 
A) 3.3 kg ∙ m/s 
B) 4.8 kg ∙ m/s 
C) 1.8 kg ∙ m/s 
D) 1.5 kg ∙ m/s 
E) 2.4 kg ∙ m/s

Question 3

A 0.330-kg volleyball is thrown vertically downward with a speed of 0.150 m/s in a place where g = 9.81 m/s2.It takes it 0.0655 s to reach the ground.What is the magnitude of its momentum just before it hits the ground?

Accepted Answer

A) 0.212 kg ∙ m/s 
B) 0.262 kg ∙ m/s 
C) 0.163 kg ∙ m/s 
D) 0.0216 kg ∙ m/s 
E) 0.0418 kg ∙ m/s 
A) 0.212 kg ∙ m/s 
B) 0.262 kg ∙ m/s 
C) 0.163 kg ∙ m/s 
D) 0.0216 kg ∙ m/s 
E) 0.0418 kg ∙ m/s

Question 4

Two friends are standing on opposite ends of a canoe that is initially at rest with respect to a frictionless lake.The person in the front throws a very massive ball toward the back,and the person in the back catches it.After the ball is caught,the canoe is

Accepted Answer

A) moving backward. 
B) stationary. 
C) moving forward. 
A) moving backward. 
B) stationary. 
C) moving forward.

Question 5

A block of mass m = 5.6 kg,moving on a frictionless surface with a velocity of $v _ { \mathrm { i } } = 6.5 \mathrm {~m} / \mathrm { s }$ to the right,collides with a block of mass M at rest,as shown in the figure.After the collision,the 5.6-kg block recoils with a velocity of $v _ { \mathrm { f } } = 0.70 \mathrm {~m} / \mathrm { s }$ to the left.If the blocks are in contact for 0.20 s,what is the magnitude of the average force exerted on the 5.6-kg block,while the two blocks are in contact?

Accepted Answer

A) 202 N 
B) 192 N 
C) 182 N 
D) 0 N 
A) 202 N 
B) 192 N 
C) 182 N 
D) 0 N

Question 6

A 60-kg swimmer suddenly dives horizontally from a 150-kg raft with a speed of 1.5 m/s.The raft is initially at rest.What is the speed of the raft immediately after the diver jumps,assuming that the water has negligible effect on the raft during the jump?

Accepted Answer

The answer of A 60-kg swimmer suddenly dives horizontally from...

Question 7

A 14-cm diameter champagne bottle rests on its side on top of a frictionless horizontal table.Suddenly,the cork pops and the bottle slides backward,covering a distance of $22.0 \mathrm {~cm}$ in $0.44 \mathrm {~s}$ If the mass of the bottle is 500 times the mass of the cork,find the distance from the original position that the cork will land on the table.Neglect air resistance and assume that the cork is very small compared to the bottle.

Accepted Answer

A) 3000 cm 
B) 60 m 
C) 85 m 
D) 8.5 cm 
A) 3000 cm 
B) 60 m 
C) 85 m 
D) 8.5 cm

Question 8

Astronaut Jennifer's lifeline to her spaceship comes loose and she finds herself stranded,"floating" 100 m from the mothership.She suddenly throws her 2.00-kg wrench at 20 m/s in a direction away from the ship.If she and her spacesuit have a combined mass of 200 kg,how long does it take her to coast back to her spaceship?

Accepted Answer

A) 1000 s 
B) 750 s 
C) 500 s 
D) 250 s 
E) 2.50 min 
A) 1000 s 
B) 750 s 
C) 500 s 
D) 250 s 
E) 2.50 min

Question 9

You are standing on a skateboard,initially at rest.A friend throws a very heavy ball towards you.You have two choices about what to do with the ball: either catch the ball or deflect it back toward your friend with the same speed as it was originally thrown.Which choice should you make in order to maximize your speed on the skateboard?

Accepted Answer

A) Catch the ball. 
B) Deflect the ball back. 
C) Your final speed on the skateboard will be the same regardless whether you catch the ball or deflect the ball. 
A) Catch the ball. 
B) Deflect the ball back. 
C) Your final speed on the skateboard will be the same regardless whether you catch the ball or deflect the ball.

Question 10

A 0.140-kg baseball is thrown with a velocity of $27.1 \mathrm {~m} / \mathrm { s }$ It is struck by the bat exerting an average force of 5000 N,which results in a velocity of 37.0 m/s in the opposite direction from the original velocity.How long were the bat and ball in contact?

Accepted Answer

A) 1.79 × 10-3 s 
B) 1.28 × 10-2 s 
C) 3.07 × 10-2 s 
D) 4.30 × 10-3 s 
A) 1.79 × 10-3 s 
B) 1.28 × 10-2 s 
C) 3.07 × 10-2 s 
D) 4.30 × 10-3 s

Question 11

What is the magnitude of the momentum of a 0.140 kg baseball traveling at 45.0 m/s?

Accepted Answer

The answer of What is the magnitude of the momentum...

Question 12

A forklift pushes a 100-kg crate,starting from rest,exerting a horizontal force of magnitude F.The graph in the figure shows the x component of this force as a function of time.What is the instantaneous velocity of the crate at time t = 10 s?

Accepted Answer

A) 25 cm/s 
B) 0.00 cm/s 
C) 75 cm/s 
D) -25 cm/s 
E) -75 cm/s 
A) 25 cm/s 
B) 0.00 cm/s 
C) 75 cm/s 
D) -25 cm/s 
E) -75 cm/s

Question 13

In a collision between two objects of unequal mass,which object receives a greater magnitude impulse?

Accepted Answer

A) the object of larger mass 
B) the object of smaller mass 
C) They receive equal magnitude impulses. 
A) the object of larger mass 
B) the object of smaller mass 
C) They receive equal magnitude impulses.

Question 14

Two astronauts,of masses 60 kg and 80 kg,are initially right next to each other and at rest in outer space.They suddenly push each other apart.How far has the heavier astronaut moved when the lighter astronaut has moved 12 m?

Accepted Answer

A) 16 m 
B) 9.0 m 
C) 21 m 
D) 7.0 m 
E) 12 m 
A) 16 m 
B) 9.0 m 
C) 21 m 
D) 7.0 m 
E) 12 m

Question 15

A 1200-kg car moving at $15.6 \mathrm {~m} / \mathrm { s }$ suddenly collides with a stationary car of mass $1500 \mathrm {~kg} \text {. }$ If the two vehicles lock together,what is their combined velocity immediately after the collision?

Accepted Answer

A) 6.9 m/s 
B) 8.6 m/s 
C) 12.1 m/s 
D) 5.5 m/s 
A) 6.9 m/s 
B) 8.6 m/s 
C) 12.1 m/s 
D) 5.5 m/s

Question 16

In a police ballistics test,2.00-g bullet traveling at 700 m/s suddenly hits and becomes embedded in a stationary 5.00-kg wood block.What is the speed of the block immediately after the bullet has stopped moving relative to the block?

Accepted Answer

The answer of In a police ballistics test,2.00-g bullet traveling...

Question 17

A golf club exerts an average horizontal force of 1000 N on a 0.045-kg golf ball that is initially at rest on the tee.The club is in contact with the ball for 1.8 ms.What is the speed of the golf ball just as it leaves the tee?

Accepted Answer

A) 30 m/s 
B) 35 m/s 
C) 40 m/s 
D) 45 m/s 
E) 50 m/s 
A) 30 m/s 
B) 35 m/s 
C) 40 m/s 
D) 45 m/s 
E) 50 m/s

Question 18

A 0.140-kg baseball is dropped and reaches a speed of 1.20 m/s just before it hits the ground and bounces.It rebounds with an upward velocity of 1.00 m/s.What is the change of the ball's momentum during the bounce?

Accepted Answer

A) 0.0280 kg ∙ m/s upwards 
B) 0.0280 kg ∙ m/s downwards 
C) 0.308 kg ∙ m/s upwards 
D) 0.308 kg ∙ m/s downwards 
E) 0.000 kg ∙ m/s 
A) 0.0280 kg ∙ m/s upwards 
B) 0.0280 kg ∙ m/s downwards 
C) 0.308 kg ∙ m/s upwards 
D) 0.308 kg ∙ m/s downwards 
E) 0.000 kg ∙ m/s

Question 19

A batter hits a 0.140-kg baseball that was approaching him at 30 m/s and,as a result,the ball leaves the bat at 40 m/s in the reverse of its original direction.The ball remains in contact with the bat for 2.0 ms.What is the magnitude of the average force exerted by the bat on the ball?

Accepted Answer

The answer of A batter hits a 0.140-kg baseball that...

Question 20

A rubber ball and a lump of clay have equal mass.They are thrown with equal speed against a wall.The ball bounces back with nearly the same speed with which it hit.The clay sticks to the wall.Which one of these objects has the greater momentum change?

Accepted Answer

A) the ball 
B) the clay 
C) Both of them have the same non-zero momentum change. 
D) Both of them have zero momentum change. 
A) the ball 
B) the clay 
C) Both of them have the same non-zero momentum change. 
D) Both of them have zero momentum change.

Exam 6: Impulse and Linear Momentum

Calculate the impulse due to a force of 4.5 N4.5 \mathrm {~N}4.5 N that lasts for 1.4 s1.4 \mathrm {~s}1.4 s

A 100-g ball falls from a window that is 12 m above ground level and experiences no significant air resistance as it falls.What is its momentum when it strikes the ground?

A 0.330-kg volleyball is thrown vertically downward with a speed of 0.150 m/s in a place where g = 9.81 m/s2.It takes it 0.0655 s to reach the ground.What is the magnitude of its momentum just before it hits the ground?

Two friends are standing on opposite ends of a canoe that is initially at rest with respect to a frictionless lake.The person in the front throws a very massive ball toward the back,and the person in the back catches it.After the ball is caught,the canoe is

A 60-kg swimmer suddenly dives horizontally from a 150-kg raft with a speed of 1.5 m/s.The raft is initially at rest.What is the speed of the raft immediately after the diver jumps,assuming that the water has negligible effect on the raft during the jump?

A 0.140-kg baseball is thrown with a velocity of 27.1 m/s27.1 \mathrm {~m} / \mathrm { s }27.1 m/s It is struck by the bat exerting an average force of 5000 N,which results in a velocity of 37.0 m/s in the opposite direction from the original velocity.How long were the bat and ball in contact?

What is the magnitude of the momentum of a 0.140 kg baseball traveling at 45.0 m/s?

A forklift pushes a 100-kg crate,starting from rest,exerting a horizontal force of magnitude F.The graph in the figure shows the x component of this force as a function of time.What is the instantaneous velocity of the crate at time t = 10 s?

In a collision between two objects of unequal mass,which object receives a greater magnitude impulse?

Two astronauts,of masses 60 kg and 80 kg,are initially right next to each other and at rest in outer space.They suddenly push each other apart.How far has the heavier astronaut moved when the lighter astronaut has moved 12 m?

A 1200-kg car moving at 15.6 m/s15.6 \mathrm {~m} / \mathrm { s }15.6 m/s suddenly collides with a stationary car of mass 1500 kg. 1500 \mathrm {~kg} \text {. }1500 kg. If the two vehicles lock together,what is their combined velocity immediately after the collision?

In a police ballistics test,2.00-g bullet traveling at 700 m/s suddenly hits and becomes embedded in a stationary 5.00-kg wood block.What is the speed of the block immediately after the bullet has stopped moving relative to the block?

A golf club exerts an average horizontal force of 1000 N on a 0.045-kg golf ball that is initially at rest on the tee.The club is in contact with the ball for 1.8 ms.What is the speed of the golf ball just as it leaves the tee?

A 0.140-kg baseball is dropped and reaches a speed of 1.20 m/s just before it hits the ground and bounces.It rebounds with an upward velocity of 1.00 m/s.What is the change of the ball's momentum during the bounce?

A batter hits a 0.140-kg baseball that was approaching him at 30 m/s and,as a result,the ball leaves the bat at 40 m/s in the reverse of its original direction.The ball remains in contact with the bat for 2.0 ms.What is the magnitude of the average force exerted by the bat on the ball?

A rubber ball and a lump of clay have equal mass.They are thrown with equal speed against a wall.The ball bounces back with nearly the same speed with which it hit.The clay sticks to the wall.Which one of these objects has the greater momentum change?

Introduction

Kinematics: Motion in One Dimension

Newtonian Mechanics

Applying Newtons Laws

Circular Motion

Work and Energy

Extended Bodies at Rest

Rotational Motion

Gases

Static Fluids

Fluids in Motion

First Law of Thermodynamics

Second Law of Thermodynamics

Electric Charge force and Energy

The Electric Field

Dc Circuits

Magnetism

Electromagnetic Induction

Vibrational Motion

Mechanical Waves

Reflection and Refraction

Mirrors and Lenses

Wave Optics

Electromagnetic Waves

Special Relativity

Quantum Optics

Atomic Physics

Nuclear Physics

Particle Physics

Filters

Calculate the impulse due to a force of $4.5 \mathrm {~N}$ that lasts for $1.4 \mathrm {~s}$

A 0.330-kg volleyball is thrown vertically downward with a speed of 0.150 m/s in a place where g = 9.81 m/s².It takes it 0.0655 s to reach the ground.What is the magnitude of its momentum just before it hits the ground?

A 0.140-kg baseball is thrown with a velocity of $27.1 \mathrm {~m} / \mathrm { s }$ It is struck by the bat exerting an average force of 5000 N,which results in a velocity of 37.0 m/s in the opposite direction from the original velocity.How long were the bat and ball in contact?

A 1200-kg car moving at $15.6 \mathrm {~m} / \mathrm { s }$ suddenly collides with a stationary car of mass $1500 \mathrm {~kg} \text {. }$ If the two vehicles lock together,what is their combined velocity immediately after the collision?