Question 1

A 0.28-kg stone you throw rises 34.3 m in the air.The magnitude of the impulse the stone received from your hand while being thrown is

Accepted Answer

A) 0.27 N's 
B) 2.7 N's 
C) 7.3 N's 
D) 9.6 N's 
E) 34.3 N's 
A) 0.27 N's 
B) 2.7 N's 
C) 7.3 N's 
D) 9.6 N's 
E) 34.3 N's

Question 2

A 5.0-kg mass with an initial velocity of 4.0 m/s,east collides with a 4.0-kg mass with an initial velocity of 3.0 m/s,west.After the collision the 5.0-kg mass has a velocity of 1.2 m/s,south.What is the magnitude of the velocity of the 4.0-kg mass after the collision?

Accepted Answer

A) 2.0 m/s 
B) 1.5 m/s 
C) 1.0 m/s 
D) 2.5 m/s 
E) 3.0 m/s 
A) 2.0 m/s 
B) 1.5 m/s 
C) 1.0 m/s 
D) 2.5 m/s 
E) 3.0 m/s

Question 3

A 0.28-kg stone you throw rises 34.3 m in the air.The impulse the stone receives from your hand while being thrown is

Accepted Answer

A) 2.7 N . s,up. 
B) 2.7 N . s,down. 
C) 7.3 N . s,up. 
D) 7.3 N . s,down. 
E) 9.6 N . s,up. 
A) 2.7 N . s,up. 
B) 2.7 N . s,down. 
C) 7.3 N . s,up. 
D) 7.3 N . s,down. 
E) 9.6 N . s,up.

Question 4

The law of conservation of momentum applies to a collision between two bodies since

Accepted Answer

A) they exert equal and opposite forces on each other. 
B) they exert forces on each other respectively proportional to their masses. 
C) they exert forces on each other respectively proportional to their velocities. 
D) they exert forces on each other respectively inversely proportional to their masses. 
E) their accelerations are proportional to their masses. 
A) they exert equal and opposite forces on each other. 
B) they exert forces on each other respectively proportional to their masses. 
C) they exert forces on each other respectively proportional to their velocities. 
D) they exert forces on each other respectively inversely proportional to their masses. 
E) their accelerations are proportional to their masses.

Question 5

An 80-g particle moving with an initial speed of 50 m/s in the positive x direction strikes and sticks to a 60-g particle moving 50 m/s in the positive y direction.How much kinetic energy is lost in this collision?

Accepted Answer

A) 96 J 
B) 89 J 
C) 175 J 
D) 86 J 
E) 110 J 
A) 96 J 
B) 89 J 
C) 175 J 
D) 86 J 
E) 110 J

Question 6

The value of the momentum of a system is the same at a later time as at an earlier time if there are no

Accepted Answer

A) collisions between particles within the system. 
B) inelastic collisions between particles within the system. 
C) changes of momentum of individual particles within the system. 
D) internal forces acting between particles within the system. 
E) external forces acting on particles of the system. 
A) collisions between particles within the system. 
B) inelastic collisions between particles within the system. 
C) changes of momentum of individual particles within the system. 
D) internal forces acting between particles within the system. 
E) external forces acting on particles of the system.

Question 7

A 3.0-kg ball with an initial velocity of (4 î + 3 ĵ )m/s collides with a wall and rebounds with a velocity of (-4 î + 3 ĵ )m/s.What is the impulse exerted on the ball by the wall?

Accepted Answer

A) +24 î N's 
B) -24 î N's 
C) +18 ĵ N'S 
D) -+18 ĵ N'S 
E) +8.0 î N's 
A) +24 î N's 
B) -24 î N's 
C) +18 ĵ N'S 
D) -+18 ĵ N'S 
E) +8.0 î N's

Question 8

High-speed stroboscopic photographs show that the head of a golf club of mass 200 grams is traveling at 55.0 m/s just before it strikes a 46.0-gram golf ball at rest on a tee.After the collision,the clubhead travels (in the same direction)at 40.0 m/s.Find the speed of the golf ball just after impact.

Accepted Answer

The answer of High-speed stroboscopic photographs show that the head...

Question 9

When two bodies of different masses collide,the impulses they exert on each other are

Accepted Answer

A) equal for all collisions. 
B) equal but opposite for all collisions. 
C) equal but opposite only for elastic collisions. 
D) equal but opposite only for inelastic collisions. 
E) equal but opposite only when the bodies have equal but opposite accelerations. 
A) equal for all collisions. 
B) equal but opposite for all collisions. 
C) equal but opposite only for elastic collisions. 
D) equal but opposite only for inelastic collisions. 
E) equal but opposite only when the bodies have equal but opposite accelerations.

Question 10

A 3.00-kg stone is dropped from a 39.2 m high building.When the stone has fallen 19.6 m,the magnitude of the impulse the Earth has received from the gravitational force exerted by the stone is

Accepted Answer

A) 9.80 N . s. 
B) 19.6 N . s. 
C) 29.4 N . s. 
D) 58.8 N . s. 
E) 118 N . s. 
A) 9.80 N . s. 
B) 19.6 N . s. 
C) 29.4 N . s. 
D) 58.8 N . s. 
E) 118 N . s.

Question 11

A 1.6-kg block is attached to the end of a 2.0-m string to form a pendulum.The pendulum is released from rest when the string is horizontal.At the lowest point of its swing when it is moving horizontally,the block is hit by a 10-g bullet moving horizontally in the opposite direction.The bullet remains in the block and causes the block to come to rest at the low point of its swing.What was the magnitude of the bullet's velocity just before hitting the block?

Accepted Answer

A) 1.0 km/s 
B) 1.6 km/s 
C) 1.2 km/s 
D) 1.4 km/s 
E) 1.8 km/s 
A) 1.0 km/s 
B) 1.6 km/s 
C) 1.2 km/s 
D) 1.4 km/s 
E) 1.8 km/s

Question 12

Two blocks with masses 2.0 kg and 3.0 kg are placed on a horizontal frictionless surface.A light spring is placed in a horizontal position between the blocks.The blocks are pushed together,compressing the spring,and then released from rest.After contact with the spring ends,the 3.0-kg mass has a speed of 2.0 m/s.How much potential energy was stored in the spring when the blocks were released?

Accepted Answer

A) 15 J 
B) 3.0 J 
C) 6.0 J 
D) 12 J 
E) 9.0 J 
A) 15 J 
B) 3.0 J 
C) 6.0 J 
D) 12 J 
E) 9.0 J

Question 13

At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction,a 75-g particle has a velocity of 20 m/s in the positive x direction.What is the speed of the center of mass of this two-particle system at this instant?

Accepted Answer

A) 16 m/s 
B) 45 m/s 
C) 23 m/s 
D) 20 m/s 
E) 36 m/s 
A) 16 m/s 
B) 45 m/s 
C) 23 m/s 
D) 20 m/s 
E) 36 m/s

Question 14

A 2.0-kg object moving 3.0 m/s strikes a 1.0-kg object initially at rest.Immediately after the collision,the 2.0-kg object has a velocity of 1.5 m/s directed 30$\degree$ from its initial direction of motion.What is the y component of the velocity of the 1.0-kg object just after the collision?

Accepted Answer

A) -3.7 m/s 
B) -3.4 m/s 
C) -1.5 m/s 
D) -2.4 m/s 
E) -4.1 m/s 
A) -3.7 m/s 
B) -3.4 m/s 
C) -1.5 m/s 
D) -2.4 m/s 
E) -4.1 m/s

Question 15

A 10-g bullet moving horizontally with a speed of 1.8 km/s strikes and passes through a 5.0-kg block initially at rest on a horizontal frictionless surface.The bullet emerges from the block with a speed of 1.0 km/s.What is the kinetic energy of the block immediately after the bullet emerges?

Accepted Answer

A) 8.0 J 
B) 6.4 J 
C) 5.3 J 
D) 9.4 J 
E) 10 J 
A) 8.0 J 
B) 6.4 J 
C) 5.3 J 
D) 9.4 J 
E) 10 J

Question 16

Stan argues that momentum cannot be conserved when a collision is not a head-on collision.Rachel insists it is conserved because each body receives an impulse of equal magnitude.Rachel is correct because

Accepted Answer

A) each body exerts an equal and opposite force on the other during the collision. 
B) the forces act during equal time intervals. 
C) the law of conservation of momentum for an isolated system is a vector equation. 
D) of all of the above. 
E) of only (a)and (b)above. 
A) each body exerts an equal and opposite force on the other during the collision. 
B) the forces act during equal time intervals. 
C) the law of conservation of momentum for an isolated system is a vector equation. 
D) of all of the above. 
E) of only (a)and (b)above.

Question 17

A 10-g bullet moving 1 000 m/s strikes and passes through a 2.0-kg block initially at rest,as shown.The bullet emerges from the block with a speed of 400 m/s.To what maximum height will the block rise above its initial position?

Accepted Answer

A) 78 cm 
B) 66 cm 
C) 56 cm 
D) 46 cm 
E) 37 cm 
A) 78 cm 
B) 66 cm 
C) 56 cm 
D) 46 cm 
E) 37 cm

Question 18

A 2.0-kg object moving 5.0 m/s collides with and sticks to an 8.0-kg object initially at rest.Determine the kinetic energy lost by the system as a result of this collision.

Accepted Answer

A) 20 J 
B) 15 J 
C) 30 J 
D) 25 J 
E) 5.0 J 
A) 20 J 
B) 15 J 
C) 30 J 
D) 25 J 
E) 5.0 J

Question 19

A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40$\degree$ angle to the ground.The magnitude of the vertical impulse the catapult receives from the rock is

Accepted Answer

A) 5.1 * 104 N . s. 
B) 6.1 *104 N . s. 
C) 8.0 * 104 N . s. 
D) 5.0 * 105 N . s. 
E) 6.0 * 105 N . s. 
A) 5.1 * 104 N . s. 
B) 6.1 *104 N . s. 
C) 8.0 * 104 N . s. 
D) 5.0 * 105 N . s. 
E) 6.0 * 105 N . s.

Question 20

A pitcher claims he can throw a baseball with as much momentum as a 3.00-g bullet moving with a speed of 1 500 m/s.A baseball has a mass of 0.145 kg.What must be its speed if the pitcher's claim is valid?

Accepted Answer

The answer of A pitcher claims he can throw a...

Exam 8: Momentum and Collisions

A 0.28-kg stone you throw rises 34.3 m in the air.The magnitude of the impulse the stone received from your hand while being thrown is

A 5.0-kg mass with an initial velocity of 4.0 m/s,east collides with a 4.0-kg mass with an initial velocity of 3.0 m/s,west.After the collision the 5.0-kg mass has a velocity of 1.2 m/s,south.What is the magnitude of the velocity of the 4.0-kg mass after the collision?

A 0.28-kg stone you throw rises 34.3 m in the air.The impulse the stone receives from your hand while being thrown is

The law of conservation of momentum applies to a collision between two bodies since

An 80-g particle moving with an initial speed of 50 m/s in the positive x direction strikes and sticks to a 60-g particle moving 50 m/s in the positive y direction.How much kinetic energy is lost in this collision?

The value of the momentum of a system is the same at a later time as at an earlier time if there are no

A 3.0-kg ball with an initial velocity of (4 î + 3 ĵ )m/s collides with a wall and rebounds with a velocity of (-4 î + 3 ĵ )m/s.What is the impulse exerted on the ball by the wall?

When two bodies of different masses collide,the impulses they exert on each other are

A 3.00-kg stone is dropped from a 39.2 m high building.When the stone has fallen 19.6 m,the magnitude of the impulse the Earth has received from the gravitational force exerted by the stone is

At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction,a 75-g particle has a velocity of 20 m/s in the positive x direction.What is the speed of the center of mass of this two-particle system at this instant?

A 2.0-kg object moving 3.0 m/s strikes a 1.0-kg object initially at rest.Immediately after the collision,the 2.0-kg object has a velocity of 1.5 m/s directed 30 °\degree° from its initial direction of motion.What is the y component of the velocity of the 1.0-kg object just after the collision?

A 10-g bullet moving horizontally with a speed of 1.8 km/s strikes and passes through a 5.0-kg block initially at rest on a horizontal frictionless surface.The bullet emerges from the block with a speed of 1.0 km/s.What is the kinetic energy of the block immediately after the bullet emerges?

Stan argues that momentum cannot be conserved when a collision is not a head-on collision.Rachel insists it is conserved because each body receives an impulse of equal magnitude.Rachel is correct because

A 10-g bullet moving 1 000 m/s strikes and passes through a 2.0-kg block initially at rest,as shown.The bullet emerges from the block with a speed of 400 m/s.To what maximum height will the block rise above its initial position?

A 2.0-kg object moving 5.0 m/s collides with and sticks to an 8.0-kg object initially at rest.Determine the kinetic energy lost by the system as a result of this collision.

A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40 °\degree° angle to the ground.The magnitude of the vertical impulse the catapult receives from the rock is

A pitcher claims he can throw a baseball with as much momentum as a 3.00-g bullet moving with a speed of 1 500 m/s.A baseball has a mass of 0.145 kg.What must be its speed if the pitcher's claim is valid?

Introduction and Vectors

Motion in One Dimension

Motion in Two Dimensions

The Laws of Motion

More Applications of Newtons Laws

Energy of a System

Conservation of Energy

Relativity

Rotational Motion

Gravity,planetary Orbits,and the Hydrogen Atom

Oscillatory Motion

Mechanical Waves

Superposition and Standing Waves

Fluid Mechanics

Temperature and the Kinetic Theory of Gases

Energy in Thermal Processes: the First Law of Thermodynamics

Heat Engines,entropy,and the Second Law of Thermodynamics

Electric Forces and Electric Fields

Electric Potential and Capacitance

Current and Direct Current Circuits

Magnetic Forces and Magnetic Fields

Faradays Law and Inductance

Electromagnetic Waves

Reflection and Refraction of Light

Image Formation by Mirrors and Lenses

Wave Optics

Quantum Physics

Atomic Physics

Nuclear Physics

Particle Physics

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A 2.0-kg object moving 3.0 m/s strikes a 1.0-kg object initially at rest.Immediately after the collision,the 2.0-kg object has a velocity of 1.5 m/s directed 30 $\degree$ from its initial direction of motion.What is the y component of the velocity of the 1.0-kg object just after the collision?

A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40 $\degree$ angle to the ground.The magnitude of the vertical impulse the catapult receives from the rock is