Question 1

A 5 kg ball collides head-on with a 10 kg ball,which is initially stationary.The collision is inelastic.Which statement is true?

Accepted Answer

A) The magnitude of the change of velocity the 5 kg ball experiences is greater than that of the 10 kg ball. 
B) The magnitude of the change of velocity the 5 kg ball experiences is less than that of the 10 kg ball. 
C) The magnitude of the change of velocity the 5 kg ball experiences is equal to that of the 10 kg ball. 
D) The magnitude of the change of the momentum of the 5 kg ball is equal to the magnitude of the change of momentum of the 10 kg ball. 
E) Two of the above statements are true. 
A) The magnitude of the change of velocity the 5 kg ball experiences is greater than that of the 10 kg ball. 
B) The magnitude of the change of velocity the 5 kg ball experiences is less than that of the 10 kg ball. 
C) The magnitude of the change of velocity the 5 kg ball experiences is equal to that of the 10 kg ball. 
D) The magnitude of the change of the momentum of the 5 kg ball is equal to the magnitude of the change of momentum of the 10 kg ball. 
E) Two of the above statements are true.

Question 2

A car of mass 1411 kg collides head-on with a parked truck of mass 2000 kg.Spring mounted bumpers ensure that the collision is essentially elastic.If the velocity of the truck is 17 km/h (in the same direction as the car's initial velocity)after the collision,what is the initial speed of the car?

Accepted Answer

A) 21 km/h 
B) 42 km/h 
C) 32 km/h 
D) 11 km/h 
A) 21 km/h 
B) 42 km/h 
C) 32 km/h 
D) 11 km/h

Question 3

-A block of mass m = 7.6 kg,moving on a frictionless surface with a speed vi = 7.6 m/s,makes a perfectly elastic collision with a block of mass M at rest.After the collision,the 7.6 kg block recoils with a speed of vf = 2.5 m/s.In the figure,the blocks are in contact for 0.20 s.The average force on the 7.6 kg block,while the two blocks are in contact,is closest to:

Accepted Answer

A) 384 N 
B) 336 N 
C) 289 N 
D) 241 N 
E) 194 N 
A) 384 N 
B) 336 N 
C) 289 N 
D) 241 N 
E) 194 N

Question 4

-In the figure,determine the character of the collision.The masses of the blocks,and the velocities before and after are given.The collision is:

Accepted Answer

A) perfectly elastic. 
B) partially inelastic. 
C) completely inelastic. 
D) not possible because momentum is not conserved. 
A) perfectly elastic. 
B) partially inelastic. 
C) completely inelastic. 
D) not possible because momentum is not conserved.

Question 5

A steel ball is thrown in the air with a speed of 3.6 m/s at an angle of 70° from the horizontal.It drops on another steel ball of 1.4 times its mass resting on a sandy surface.If the original ball comes to a rest after the collision and the resting ball bounces,find the horizontal component of its velocity.

Accepted Answer

A) 0.88 m/s 
B) 1.7 m/s 
C) 2.4 m/s 
D) 0.72 m/s 
A) 0.88 m/s 
B) 1.7 m/s 
C) 2.4 m/s 
D) 0.72 m/s

Question 6

During World War I,Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away.This gun also had a long barrel.What is the reason for using a long barrel in these guns?

Accepted Answer

A) to reduce frictional losses 
B) to allow the force of the expanding gases from the gunpowder to act for a longer time 
C) to increase the force exerted on the bullet due to the expanding gases from the gunpowder 
D) to reduce the force exerted on the bullet due to the expanding gases from the gunpowder 
A) to reduce frictional losses 
B) to allow the force of the expanding gases from the gunpowder to act for a longer time 
C) to increase the force exerted on the bullet due to the expanding gases from the gunpowder 
D) to reduce the force exerted on the bullet due to the expanding gases from the gunpowder

Question 7

A ball of clay is thrown against a wall and sticks there.In this process,momentum is not conserved because the clay stops moving.

Accepted Answer

A) True 
 B)False

Question 8

A 14 cm diameter champagne bottle rests on its side on top of a frictionless table.Suddenly,the cork pops and the bottle slides backward for a distance of 22.0 cm in 0.44 s.If the mass of the bottle is 500 times the mass of the cork,find the distance from the original position the cork will land on the table.

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 9

A golf ball of mass 0.050 kg is at rest on the tee and has a velocity of 102 m/s immediately after being struck.If the club and ball were in contact for 0.81 ms,what is the average force exerted on the ball?

Accepted Answer

A) 6.3 kN 
B) 7.1 kN 
C) 5.5 kN 
D) 4.9 kN 
A) 6.3 kN 
B) 7.1 kN 
C) 5.5 kN 
D) 4.9 kN

Question 10

As a tile falls from the roof of a building to the ground its momentum is conserved.

Accepted Answer

A) True 
 B)False

Question 11

A 1.4 kg object at x = 2.00 m,y = 3.10 m moves at 4.62 m/s at an angle 45° north of east.Calculate the magnitude of the object's angular momentum about the origin.

Accepted Answer

A) 5.0 kg∙ m2/s 
B) 3.6 kg∙ m2/s 
C) 6.0 kg∙ m2/s 
D) 7.0 kg∙ m2/s 
A) 5.0 kg∙ m2/s 
B) 3.6 kg∙ m2/s 
C) 6.0 kg∙ m2/s 
D) 7.0 kg∙ m2/s

Question 12

-In the figure,determine the character of the collision.The masses of the blocks,and the velocities before and after are given.The collision is:

Accepted Answer

A) perfectly elastic. 
B) partially inelastic. 
C) completely inelastic. 
D) characterized by an increase in kinetic energy. 
E) not possible because momentum is not conserved. 
A) perfectly elastic. 
B) partially inelastic. 
C) completely inelastic. 
D) characterized by an increase in kinetic energy. 
E) not possible because momentum is not conserved.

Question 13

Two friends are standing on opposite ends of a canoe.The canoe is initially at rest with respect to the lake.The person on the right throws a very massive ball to the left,and the person on the left catches it.After the ball is caught (ignoring friction between the canoe and the water),the canoe is

Accepted Answer

A) stationary. 
B) moving to the right. 
C) moving to the left. 
A) stationary. 
B) moving to the right. 
C) moving to the left.

Question 14

A fisherman throws the anchor off her boat at an angle of 3.0° above the horizontal.If the anchor weighs 2.0 times as much as she does and the boat moves with speed 2.7 m/s during the launch,how fast did she throw the anchor? (Solve for her frame of reference.Assume the mass of the boat is negligible. )

Accepted Answer

A) 4.1 m/s 
B) 1.4 m/s 
C) 4.0 m/s 
D) 1.3 m/s 
A) 4.1 m/s 
B) 1.4 m/s 
C) 4.0 m/s 
D) 1.3 m/s

Question 15

-A block of mass m = 2.2 kg,moving on frictionless surface with a speed vi = 9.1 m/s,makes a perfectly elastic collision with a block of mass M at rest.After the collision,the 2.2 kg block recoils with a speed of vf = 0.7 m/s.In the figure,the mass M is closest to:

Accepted Answer

A) 2.6 kg 
B) 18.48 kg 
C) 2.4 kg 
D) 31 kg 
E) 2.2 kg 
A) 2.6 kg 
B) 18.48 kg 
C) 2.4 kg 
D) 31 kg 
E) 2.2 kg

Question 16

A 1120 kg car experiences an impulse of 30,000.0 N · s during a collision with a wall.If the collision takes 0.43 s,what was the velocity of the car just before the collision?

Accepted Answer

A) 27 m/s 
B) 12 m/s 
C) 63 m/s 
D) 22 m/s 
A) 27 m/s 
B) 12 m/s 
C) 63 m/s 
D) 22 m/s

Question 17

A 480 kg car moving at 14.4 m/s hits from behind another car moving at 13.3 m/s in the same direction.If the second car has a mass of 570 kg and a new speed of 17.9 m/s,what is the velocity of the first car after the collision?

Accepted Answer

A) 8.94 m/s 
B) 10.5 m/s 
C) 19.9 m/s 
D) - 8.94 m/s 
A) 8.94 m/s 
B) 10.5 m/s 
C) 19.9 m/s 
D) - 8.94 m/s

Question 18

A child swings a 0.38 kg ball in a circle on a string that is 1.3 m long.If the ball makes 1.2 rev/s,what is the magnitude of the ball's angular momentum?

Accepted Answer

A) 4.8 kg∙m2/s 
B) 0.8 kg∙m2/s 
C) 3.8 kg∙m2/s 
D) 5.3 kg∙m2/s 
A) 4.8 kg∙m2/s 
B) 0.8 kg∙m2/s 
C) 3.8 kg∙m2/s 
D) 5.3 kg∙m2/s

Question 19

Three cars,Car X,Car Y,and Car Z,begin accelerating from rest,at the same time.Car X is more massive than Car Y,which is more massive than Car Z.The net force exerted on each car is identical.After 10 seconds,which car has the most amount of momentum?

Accepted Answer

A) They all have the same amount of momentum. 
B) Car X 
C) Car Y 
D) Car Z 
A) They all have the same amount of momentum. 
B) Car X 
C) Car Y 
D) Car Z

Question 20

A 1200 kg cannon fires a 100.0 kg cannonball at 35 m/s.What is the recoil velocity of the cannon? Assume that frictional forces are negligible and the cannon is fired horizontally.

Accepted Answer

A) 2.9 m/s 
B) 35 m/s 
C) 3.5 m/s 
D) 3.2 m/s 
A) 2.9 m/s 
B) 35 m/s 
C) 3.5 m/s 
D) 3.2 m/s

Exam 9: Momentum

A 5 kg ball collides head-on with a 10 kg ball,which is initially stationary.The collision is inelastic.Which statement is true?

A car of mass 1411 kg collides head-on with a parked truck of mass 2000 kg.Spring mounted bumpers ensure that the collision is essentially elastic.If the velocity of the truck is 17 km/h (in the same direction as the car's initial velocity)after the collision,what is the initial speed of the car?

-In the figure,determine the character of the collision.The masses of the blocks,and the velocities before and after are given.The collision is:

During World War I,Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away.This gun also had a long barrel.What is the reason for using a long barrel in these guns?

A ball of clay is thrown against a wall and sticks there.In this process,momentum is not conserved because the clay stops moving.

A golf ball of mass 0.050 kg is at rest on the tee and has a velocity of 102 m/s immediately after being struck.If the club and ball were in contact for 0.81 ms,what is the average force exerted on the ball?

As a tile falls from the roof of a building to the ground its momentum is conserved.

A 1.4 kg object at x = 2.00 m,y = 3.10 m moves at 4.62 m/s at an angle 45° north of east.Calculate the magnitude of the object's angular momentum about the origin.

-In the figure,determine the character of the collision.The masses of the blocks,and the velocities before and after are given.The collision is:

Two friends are standing on opposite ends of a canoe.The canoe is initially at rest with respect to the lake.The person on the right throws a very massive ball to the left,and the person on the left catches it.After the ball is caught (ignoring friction between the canoe and the water),the canoe is

-A block of mass m = 2.2 kg,moving on frictionless surface with a speed vi = 9.1 m/s,makes a perfectly elastic collision with a block of mass M at rest.After the collision,the 2.2 kg block recoils with a speed of vf = 0.7 m/s.In the figure,the mass M is closest to:

A 1120 kg car experiences an impulse of 30,000.0 N · s during a collision with a wall.If the collision takes 0.43 s,what was the velocity of the car just before the collision?

A 480 kg car moving at 14.4 m/s hits from behind another car moving at 13.3 m/s in the same direction.If the second car has a mass of 570 kg and a new speed of 17.9 m/s,what is the velocity of the first car after the collision?

A child swings a 0.38 kg ball in a circle on a string that is 1.3 m long.If the ball makes 1.2 rev/s,what is the magnitude of the ball's angular momentum?

Three cars,Car X,Car Y,and Car Z,begin accelerating from rest,at the same time.Car X is more massive than Car Y,which is more massive than Car Z.The net force exerted on each car is identical.After 10 seconds,which car has the most amount of momentum?

A 1200 kg cannon fires a 100.0 kg cannonball at 35 m/s.What is the recoil velocity of the cannon? Assume that frictional forces are negligible and the cannon is fired horizontally.

Representing Motion

Motion in One Dimension

Vectors and Motion in Two Dimensions

Forces and Newtons Laws of Motion

Applying Newtons Laws

Circular Motion,orbits,and Gravity

Rotational Motion

Equilibrium and Elasticity

Energy and Work

Using Energy

Thermal Properties of Matter

Fluids

Oscillations

Traveling Waves and Sound

Superposition and Standing Waves

Wave Optics

Ray Optics

Optical Instruments

Electric Fields and Forces

Electric Potential

Current and Resistance

Circuits

Magnetic Fields and Forces

Electromagnetic Induction and Electromagnetic Waves

Ac Electricity

Relativity

Quantum Physics

Atoms and Molecules

Nuclear Physics

Filters

-A block of mass m = 2.2 kg,moving on frictionless surface with a speed v_i = 9.1 m/s,makes a perfectly elastic collision with a block of mass M at rest.After the collision,the 2.2 kg block recoils with a speed of v_f = 0.7 m/s.In the figure,the mass M is closest to: