Question 1

A 100-kg cannon at rest contains a 10-kg cannon ball. When fired, the cannon ball leaves the cannon with a speed of 90 m/s. What is the recoil speed of the cannon?

Accepted Answer

A) 4.5 m/s 
B) 9 m/s 
C) 45 m/s 
D) 90 m/s 
E) zero m/s 
A) 4.5 m/s 
B) 9 m/s 
C) 45 m/s 
D) 90 m/s 
E) zero m/s

Question 2

A 2.0-kg pistol fires a 1.0-g bullet with a muzzle speed of 1000 m/s. The bullet then strikes a 10-kg wooden block resting on a horizontal frictionless surface. The block and the embedded bullet then slide across the surface.  
-What is the speed of the "bullet + block" system immediately after the bullet is embedded in the block?

Accepted Answer

A) 0.1 m/s 
B) 10 m/s 
C) 1000 m/s 
D) 10 000 m/s 
E) zero m/s 
A) 0.1 m/s 
B) 10 m/s 
C) 1000 m/s 
D) 10 000 m/s 
E) zero m/s

Question 3

The drawing shows two 4.5-kg balls located on the y axis at 1.0 and 9.0 m, respectively, and a third ball with a mass 2.3 kg which is located at 6.0 m. What is the location of the center of mass of this system?

Accepted Answer

A) 4.8 m 
B) 5.2 m 
C) 5.6 m 
D) 6.0 m 
E) 6.4 m 
A) 4.8 m 
B) 5.2 m 
C) 5.6 m 
D) 6.0 m 
E) 6.4 m

Question 4

Which one of the following statements concerning center of mass is true?

Accepted Answer

A) All of an object's mass is located at its center of mass. 
B) The center of mass of an object must be located within the object. 
C) The center of mass of a system of objects cannot change even if there are forces acting on the objects. 
D) The velocity of the center of mass of a system of objects is greatly affected by a collision of objects within the system. 
E) The velocity of the center of mass of a system of objects is constant when the sum of the external forces acting on the system is zero. 
A) All of an object's mass is located at its center of mass. 
B) The center of mass of an object must be located within the object. 
C) The center of mass of a system of objects cannot change even if there are forces acting on the objects. 
D) The velocity of the center of mass of a system of objects is greatly affected by a collision of objects within the system. 
E) The velocity of the center of mass of a system of objects is constant when the sum of the external forces acting on the system is zero.

Question 5

In which one of the following situations is linear momentum not conserved?

Accepted Answer

A) A bomb suspended by a string explodes into one hundred fragments. 
B) A bowling ball collides with a set of ten pins. 
C) A golf ball is struck by a club. 
D) An astronaut floating in space throws a hammer away and subsequently moves in the opposite direction. 
E) A tree limb is struck by lightning and falls to the ground. 
A) A bomb suspended by a string explodes into one hundred fragments. 
B) A bowling ball collides with a set of ten pins. 
C) A golf ball is struck by a club. 
D) An astronaut floating in space throws a hammer away and subsequently moves in the opposite direction. 
E) A tree limb is struck by lightning and falls to the ground.

Question 6

A projectile is launched with a momentum of 200 kg • m/s and 1000 J of kinetic energy. What is the mass of the projectile?

Accepted Answer

A) 5 kg 
B) 10 kg 
C) 20 kg 
D) 40 kg 
E) 50 kg 
A) 5 kg 
B) 10 kg 
C) 20 kg 
D) 40 kg 
E) 50 kg

A 100-kg cannon at rest contains a 10-kg cannon ball. When fired, the cannon ball leaves the cannon with a speed of 90 m/s. What is the recoil speed of the cannon?

The drawing shows two 4.5-kg balls located on the y axis at 1.0 and 9.0 m, respectively, and a third ball with a mass 2.3 kg which is located at 6.0 m. What is the location of the center of mass of this system?

Which one of the following statements concerning center of mass is true?

In which one of the following situations is linear momentum not conserved?

A projectile is launched with a momentum of 200 kg •m/s and 1000 J of kinetic energy. What is the mass of the projectile?

Introduction and Mathematical Concepts

Kinematics in One Dimension

Kinematics in Two Dimensions

Forces and Newtons Laws of Motion

Dynamics of Uniform Circular Motion

Work and Energy

Rotational Kinematics

Rotational Dynamics

Simple Harmonic Motion and Elasticity

Fluids

Temperature and Heat

The Transfer of Heat

The Ideal Gas Law and Kinetic Theory

Thermodynamics

Waves and Sound

The Principle of Linear Superposition and Interference Phenomena

Electric Forces and Electric Fields

Electric Potential Energy and the Electric Potential

Electric Circuits

Magnetic Forces and Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

Electromagnetic Waves

The Refl Ection of Light: Mirrors

The Refraction of Light: Lenses and Optical Instruments

Interference and the Wave Nature of Light

Special Relativity

Particles and Waves

The Nature of the Atom

Nuclear Physics and Radioactivity

Ionizing Radiation, Nuclear Energy, and Elementary Particles

Filters

Exam 7: Impulse and Momentum

A 100-kg cannon at rest contains a 10-kg cannon ball. When fired, the cannon ball leaves the cannon with a speed of 90 m/s. What is the recoil speed of the cannon?

The drawing shows two 4.5-kg balls located on the y axis at 1.0 and 9.0 m, respectively, and a third ball with a mass 2.3 kg which is located at 6.0 m. What is the location of the center of mass of this system?

Which one of the following statements concerning center of mass is true?

In which one of the following situations is linear momentum not conserved?

A projectile is launched with a momentum of 200 kg • m/s and 1000 J of kinetic energy. What is the mass of the projectile?

Introduction and Mathematical Concepts

Kinematics in One Dimension

Kinematics in Two Dimensions

Forces and Newtons Laws of Motion

Dynamics of Uniform Circular Motion

Work and Energy

Rotational Kinematics

Rotational Dynamics

Simple Harmonic Motion and Elasticity

Fluids

Temperature and Heat

The Transfer of Heat

The Ideal Gas Law and Kinetic Theory

Thermodynamics

Waves and Sound

The Principle of Linear Superposition and Interference Phenomena

Electric Forces and Electric Fields

Electric Potential Energy and the Electric Potential

Electric Circuits

Magnetic Forces and Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

Electromagnetic Waves

The Refl Ection of Light: Mirrors

The Refraction of Light: Lenses and Optical Instruments

Interference and the Wave Nature of Light

Special Relativity

Particles and Waves

The Nature of the Atom

Nuclear Physics and Radioactivity

Ionizing Radiation, Nuclear Energy, and Elementary Particles

Filters

A projectile is launched with a momentum of 200 kg •m/s and 1000 J of kinetic energy. What is the mass of the projectile?