Question 1

Alex and Kaylee are placed at the two ends of a boat on a still lake. Alex, of mass 80 kg, decides to swap seats with Kaylee, of mass 60 kg. As a result, the boat will

Accepted Answer

A)  move in the same direction Kaylee moves. 
B)  move in the same direction Alex moves. 
C)  move in the same direction Alex moves, then move in the same direction Kaylee moves; but its net displacement is zero. 
D)  move in the same direction Kaylee moves, then move in the same direction Alex moves; but its net displacement is zero. 
E)  not move at all. 
A)  move in the same direction Kaylee moves. 
B)  move in the same direction Alex moves. 
C)  move in the same direction Alex moves, then move in the same direction Kaylee moves; but its net displacement is zero. 
D)  move in the same direction Kaylee moves, then move in the same direction Alex moves; but its net displacement is zero. 
E)  not move at all.

Question 2

A frictionless puck of mass 1.0 kg travels east at 90 m/s toward an initially motionless puck of mass 2.0 kg. When the pucks are 12 meters apart, the speed of the center of mass of the system is

Accepted Answer

A)  30 m/s. 
B)  40 m/s. 
C)  60 m/s. 
D)  80 m/s. 
E)  90 m/s. 
A)  30 m/s. 
B)  40 m/s. 
C)  60 m/s. 
D)  80 m/s. 
E)  90 m/s.

Question 3

A tennis ball moving south at 2.0 m/s collides with a stationary bowling ball. The tennis ball bounces back to the north, and the bowling ball moves very slowly to the south. The ball that experiences the greater magnitude impulse is

Accepted Answer

A)  the tennis ball. 
B)  the bowling ball. 
C)  Both the tennis and bowling balls experience the same magnitude impulse. 
D)  Both the tennis and bowling balls experience zero impulse. 
E)  More information is needed to work out the answer. 
A)  the tennis ball. 
B)  the bowling ball. 
C)  Both the tennis and bowling balls experience the same magnitude impulse. 
D)  Both the tennis and bowling balls experience zero impulse. 
E)  More information is needed to work out the answer.

Question 4

A car of mass 10 kg moves eastward at 30 m/s while a second car of mass 30 kg moves at 10 m/s westward. The magnitude of the linear momentum and the kinetic energy of the system are

Accepted Answer

A)  0 kg.m/s and 3.0 kJ. 
B)  600 kg.m/s and 3.0 kJ. 
C)  300 kg.m/s and 4.5 kJ. 
D)  600 kg.m/s and 6.0 kJ. 
E)  0 kg.m/s and 6.0 kJ. 
A)  0 kg.m/s and 3.0 kJ. 
B)  600 kg.m/s and 3.0 kJ. 
C)  300 kg.m/s and 4.5 kJ. 
D)  600 kg.m/s and 6.0 kJ. 
E)  0 kg.m/s and 6.0 kJ.

Question 5

Which of the following situation requires the least average force?

Accepted Answer

A)  Accelerating a 1.0-kg mass from 0 m/s to 10 m/s in 6.0 s 
B)  Accelerating a 2.0-kg mass from 10 m/s to 20 m/s in 6.0 s 
C)  Accelerating a 3.0-kg mass from 10 m/s to 30 m/s in 1.0 s 
D)  Accelerating a 4.0-kg mass from 0 m/s to 20 m/s in 1.0 s 
E)  Accelerating a 5.0-kg mass from 20 m/s to 30 m/s in 1.0 s 
A)  Accelerating a 1.0-kg mass from 0 m/s to 10 m/s in 6.0 s 
B)  Accelerating a 2.0-kg mass from 10 m/s to 20 m/s in 6.0 s 
C)  Accelerating a 3.0-kg mass from 10 m/s to 30 m/s in 1.0 s 
D)  Accelerating a 4.0-kg mass from 0 m/s to 20 m/s in 1.0 s 
E)  Accelerating a 5.0-kg mass from 20 m/s to 30 m/s in 1.0 s

Question 6

A 540-kg boat, originally at rest, is placed perpendicular to a dock so that the front of the boat touches the dock. A 60-kg boy jumps horizontally at 4.0 m/s from the dock to the front of the boat. The speed of the boat just after the boy jumps in is

Accepted Answer

A)  0.40 m/s. 
B)  0.44 m/s. 
C)  1.0 m/s. 
D)  4.0 m/s. 
E)  4.4 m. 
A)  0.40 m/s. 
B)  0.44 m/s. 
C)  1.0 m/s. 
D)  4.0 m/s. 
E)  4.4 m.

Exam 10: Systems of Particles

Alex and Kaylee are placed at the two ends of a boat on a still lake. Alex, of mass 80 kg, decides to swap seats with Kaylee, of mass 60 kg. As a result, the boat will

A frictionless puck of mass 1.0 kg travels east at 90 m/s toward an initially motionless puck of mass 2.0 kg. When the pucks are 12 meters apart, the speed of the center of mass of the system is

A tennis ball moving south at 2.0 m/s collides with a stationary bowling ball. The tennis ball bounces back to the north, and the bowling ball moves very slowly to the south. The ball that experiences the greater magnitude impulse is

A car of mass 10 kg moves eastward at 30 m/s while a second car of mass 30 kg moves at 10 m/s westward. The magnitude of the linear momentum and the kinetic energy of the system are

Which of the following situation requires the least average force?

A 540-kg boat, originally at rest, is placed perpendicular to a dock so that the front of the boat touches the dock. A 60-kg boy jumps horizontally at 4.0 m/s from the dock to the front of the boat. The speed of the boat just after the boy jumps in is

Space, Time, and Mass

Motion Along a Straight Line

Vectors

Motion in Two and Three Dimensions

Newtons Laws of Motion

Further Applications of Newtons Laws

Work and Energy

Conservation of Energy

Gravitation

Collisions

Rotation of a Rigid Body

Dynamics of a Rigid Body

Statics and Elasticity

Oscillations

Waves

Sound

Fluid Mechanics

The Ideal Gas

Heat

Thermodynamics

Electric Force and the Electric Charge

The Electric Field

Gauss Law

Electrostatic Potential and Energy

Capacitors and Dielectrics

Currents and Ohms Law

Direct Current Circuits

Magnetic Force and Field

Charges and Currents in Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

Electromagnetic Waves

Reflection, Refraction, and Optics

Interference and Diffraction

The Theory of Special Relativity

Quanta of Light

Spectral Lines, Bohrs Theory, and Quantum Mechanics

Quantum Structure of Atoms, Molecules, and Solids

Nuclei

Elementary Particles and Cosmology

Filters