Question 1

A rock is rolled in the sand.It starts at 6.0 m/s,moves in a straight line for a distance of 4.5 m,and then stops.What is the magnitude of the average acceleration?

Accepted Answer

A)  1.7 m/s2 
B)  4 m/s2 
C)  1.5 m/s2 
D)  0.3 m/s2 
E)  ​8 m/s2 
A)  1.7 m/s2 
B)  4 m/s2 
C)  1.5 m/s2 
D)  0.3 m/s2 
E)  ​8 m/s2 B

Question 2

A 15.0-kg block rests on a level frictionless surface and is attached by a light string to a 7.0-kg hanging mass where the string passes over a massless frictionless pulley.If g = 9.8 m/s2,what is the tension in the connecting string?

Accepted Answer

A)  3 N 
B)  27 N 
C)  129 N 
D)  47 N 
E)  ​216 N 
A)  3 N 
B)  27 N 
C)  129 N 
D)  47 N 
E)  ​216 N D

Question 3

A 150-N block,on a 25° incline,is being held motionless by friction.The coefficient of static friction between the block and the plane is 0.52.The force due to friction is:

Accepted Answer

A)  0 N. 
B)  136 N. 
C)  63 N. 
D)  150 N. 
E)  ​96 N. 
A)  0 N. 
B)  136 N. 
C)  63 N. 
D)  150 N. 
E)  ​96 N. C

Question 4

A 100-kg box is placed on a ramp.As one end of the ramp is raised,the box begins to move downward just as the angle of inclination reaches 10°.What is the coefficient of static friction between box and ramp?

Accepted Answer

A)  0.27 
B)  0.18 
C)  5.67 
D)  0.13 
E)  ​17.36 
A)  0.27 
B)  0.18 
C)  5.67 
D)  0.13 
E)  ​17.36

Question 5

A block of mass 2.00 kg rests on a horizontal surface where the coefficient of kinetic friction between the two is 0.200.A string attached to the block is pulled horizontally,resulting in a 2-m/s2 acceleration by the block.Find the tension in the string.(g = 9.80 m/s2)

Accepted Answer

A)  4 N 
B)  3.92 N 
C)  7.92 N 
D)  0.08 N 
E)  2.00​ N 
A)  4 N 
B)  3.92 N 
C)  7.92 N 
D)  0.08 N 
E)  2.00​ N

Question 6

An astronaut applies a force of 450 N to an asteroid,and it accelerates at 9.00 m/s2.What is the asteroid's mass?

Accepted Answer

A)  50 kg 
B)  450 kg 
C)  459 kg 
D)  4,050 kg 
E)  ​0.02 kg 
A)  50 kg 
B)  450 kg 
C)  459 kg 
D)  4,050 kg 
E)  ​0.02 kg

Question 7

An object weighs 300 N.If the gravitational constant G were half of what it is currently,what would the weight of the object be?

Accepted Answer

A)  300 N 
B)  150 N 
C)  75 N 
D)  600 N 
E)  ​450 N 
A)  300 N 
B)  150 N 
C)  75 N 
D)  600 N 
E)  ​450 N

Question 8

Two blocks of masses 24 kg and 9 kg are connected together by a light string and rest on a frictionless level surface.Attached to the 9-kg mass is another light string,which a person uses to pull both blocks horizontally.If the two-block system accelerates at 0.6 m/s2 what is the tension in the connecting string between the blocks?

Accepted Answer

A)  19.8 N 
B)  9 N 
C)  14.4 N 
D)  5.4 N 
E)  ​40 N 
A)  19.8 N 
B)  9 N 
C)  14.4 N 
D)  5.4 N 
E)  ​40 N

Question 9

A 18-kg mass is placed on a 28° incline and friction keeps it from sliding.The coefficient of static friction in this case is 0.591,and the coefficient of sliding friction is 0.511.What is the frictional force in this situation?

Accepted Answer

A)  82.81 N 
B)  155.75 N 
C)  79.59 N 
D)  92.05 N 
E)  ​8.45 N 
A)  82.81 N 
B)  155.75 N 
C)  79.59 N 
D)  92.05 N 
E)  ​8.45 N

Question 10

As a basketball player starts to jump for a rebound,he begins to move upward faster and faster until he leaves the floor.During this time that he is in contact with the floor,the force of the floor on his shoes is:

Accepted Answer

A)  bigger than his weight. 
B)  equal in magnitude and opposite in direction to his weight. 
C)  less than his weight. 
D)  zero. 
A)  bigger than his weight. 
B)  equal in magnitude and opposite in direction to his weight. 
C)  less than his weight. 
D)  zero.

Question 11

A 100-kg crate is placed on an adjustable inclined plane.If the crate slides down the incline with an acceleration of 0.20 m/s2 when the incline angle is 20°,then what should the incline angle be for the crate to slide down the plane at constant speed? (g = 9.8 m/s2)

Accepted Answer

A)  24° 
B)  19° 
C)  14° 
D)  29° 
E)  ​9° 
A)  24° 
B)  19° 
C)  14° 
D)  29° 
E)  ​9°

Question 12

It is late and Carlos is sliding down a rope from his third floor window to meet his friend Juan.As he slides down the rope faster and faster,he becomes frightened and grabs harder on the rope,increasing the tension in the rope.As soon as the upward tension in the rope becomes equal to his weight:

Accepted Answer

A)  Carlos will stop. 
B)  Carlos will slow down. 
C)  Carlos will continue down at a constant velocity. 
D)  the rope must break. 
A)  Carlos will stop. 
B)  Carlos will slow down. 
C)  Carlos will continue down at a constant velocity. 
D)  the rope must break.

Question 13

A 600-N tightrope walker stands at the center of the rope such that each half of the rope makes an angle of 20.0° with the horizontal.What is the tension in the rope?

Accepted Answer

A)  880 N 
B)  640 N 
C)  1,750 N 
D)  410 N 
E)  ​820 N 
A)  880 N 
B)  640 N 
C)  1,750 N 
D)  410 N 
E)  ​820 N

Question 14

A barefoot field-goal kicker imparts a speed of 25 m/s to a football at rest.If the football has a mass of 0.50 kg and time of contact with the football is 0.020 s,what is the force exerted on the foot?

Accepted Answer

A)  13 N 
B)  25 N 
C)  625 N 
D)  1,250 N 
E)  ​625 N 
A)  13 N 
B)  25 N 
C)  625 N 
D)  1,250 N 
E)  ​625 N

Question 15

As a 4.0-kg bucket is being lowered into a 13-m-deep well,starting from the top,the tension in the rope is 9 N.The acceleration of the bucket will be:

Accepted Answer

A)  7.6 m/s2 downward. 
B)  9 m/s2 downward. 
C)  zero. 
D)  2.3 m/s2 upward. 
E)  ​7.6 m/s2 upward. 
A)  7.6 m/s2 downward. 
B)  9 m/s2 downward. 
C)  zero. 
D)  2.3 m/s2 upward. 
E)  ​7.6 m/s2 upward.

Question 16

Two blocks of masses 22 kg and 9 kg are connected together by a light string and rest on a frictionless level surface.Attached to the 9-kg mass is another light string,which a person uses to pull both blocks horizontally.If the two-block system accelerates at 0.7 m/s2,what is the tension in the second string attached to the 8-kg mass?

Accepted Answer

A)  21.7 N 
B)  9.1 N 
C)  15.4 N 
D)  6.3 N 
E)  ​31 N 
A)  21.7 N 
B)  9.1 N 
C)  15.4 N 
D)  6.3 N 
E)  ​31 N

Question 17

The statement by Newton that "for every action there is an opposite but equal reaction" is regarded as which of his laws of motion?

Accepted Answer

A)  first 
B)  second 
C)  third 
D)  fourth 
A)  first 
B)  second 
C)  third 
D)  fourth

Question 18

A 60.0-kg man jumps 1.00 m down onto a concrete walkway.His downward motion stops in 0.0400 seconds.If he forgets to bend his knees,what force is transmitted to his leg bones?

Accepted Answer

A)  6,600 N 
B)  300 N 
C)  2,900 N 
D)  900 N 
E)  ​900 N 
A)  6,600 N 
B)  300 N 
C)  2,900 N 
D)  900 N 
E)  ​900 N

Question 19

Two objects,A and B,are placed on an inclined plane that can be rotated to different angles of elevation.A starts to slide at twice the angle of elevation that B starts sliding.The respective coefficients for static friction for A and B are μA and μB.Choose the last answer that is correct.

Accepted Answer

A)  μB > μA 
B)  μA > μB 
C)  μB = 2 μA 
D)  μA = 2 μB 
A)  μB > μA 
B)  μA > μB 
C)  μB = 2 μA 
D)  μA = 2 μB

Question 20

A thrown stone hits a window,but doesn't break it.Instead it reverses direction and ends up on the ground below the window.In this case,we know:

Accepted Answer

A) the force of the stone on the glass > the force of the glass on the stone. B) the force of the stone on the glass = the force of the glass on the stone. C) the force of the stone on the glass < the force of the glass on the stone. D) the stone didn't slow down as it broke the glass. A) the force of the stone on the glass > the force of the glass on the stone. B) the force of the stone on the glass = the force of the glass on the stone. C) the force of the stone on the glass < the force of the glass on the stone. D) the stone didn't slow down as it broke the glass.

Exam 4: The Laws of Motion

A rock is rolled in the sand.It starts at 6.0 m/s,moves in a straight line for a distance of 4.5 m,and then stops.What is the magnitude of the average acceleration?

A 15.0-kg block rests on a level frictionless surface and is attached by a light string to a 7.0-kg hanging mass where the string passes over a massless frictionless pulley.If g = 9.8 m/s2,what is the tension in the connecting string?

A 150-N block,on a 25° incline,is being held motionless by friction.The coefficient of static friction between the block and the plane is 0.52.The force due to friction is:

A 100-kg box is placed on a ramp.As one end of the ramp is raised,the box begins to move downward just as the angle of inclination reaches 10°.What is the coefficient of static friction between box and ramp?

A block of mass 2.00 kg rests on a horizontal surface where the coefficient of kinetic friction between the two is 0.200.A string attached to the block is pulled horizontally,resulting in a 2-m/s2 acceleration by the block.Find the tension in the string.(g = 9.80 m/s2)

An astronaut applies a force of 450 N to an asteroid,and it accelerates at 9.00 m/s2.What is the asteroid's mass?

An object weighs 300 N.If the gravitational constant G were half of what it is currently,what would the weight of the object be?

A 18-kg mass is placed on a 28° incline and friction keeps it from sliding.The coefficient of static friction in this case is 0.591,and the coefficient of sliding friction is 0.511.What is the frictional force in this situation?

As a basketball player starts to jump for a rebound,he begins to move upward faster and faster until he leaves the floor.During this time that he is in contact with the floor,the force of the floor on his shoes is:

A 100-kg crate is placed on an adjustable inclined plane.If the crate slides down the incline with an acceleration of 0.20 m/s2 when the incline angle is 20°,then what should the incline angle be for the crate to slide down the plane at constant speed? (g = 9.8 m/s2)

It is late and Carlos is sliding down a rope from his third floor window to meet his friend Juan.As he slides down the rope faster and faster,he becomes frightened and grabs harder on the rope,increasing the tension in the rope.As soon as the upward tension in the rope becomes equal to his weight:

A 600-N tightrope walker stands at the center of the rope such that each half of the rope makes an angle of 20.0° with the horizontal.What is the tension in the rope?

A barefoot field-goal kicker imparts a speed of 25 m/s to a football at rest.If the football has a mass of 0.50 kg and time of contact with the football is 0.020 s,what is the force exerted on the foot?

As a 4.0-kg bucket is being lowered into a 13-m-deep well,starting from the top,the tension in the rope is 9 N.The acceleration of the bucket will be:

The statement by Newton that "for every action there is an opposite but equal reaction" is regarded as which of his laws of motion?

A 60.0-kg man jumps 1.00 m down onto a concrete walkway.His downward motion stops in 0.0400 seconds.If he forgets to bend his knees,what force is transmitted to his leg bones?

Two objects,A and B,are placed on an inclined plane that can be rotated to different angles of elevation.A starts to slide at twice the angle of elevation that B starts sliding.The respective coefficients for static friction for A and B are μA and μB.Choose the last answer that is correct.

A thrown stone hits a window,but doesn't break it.Instead it reverses direction and ends up on the ground below the window.In this case,we know:

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

Particle Collisions, Mediating Photons, and Quark Structures: Exploring the Fundamentals of Physics

Filters

A 15.0-kg block rests on a level frictionless surface and is attached by a light string to a 7.0-kg hanging mass where the string passes over a massless frictionless pulley.If g = 9.8 m/s²,what is the tension in the connecting string?

A block of mass 2.00 kg rests on a horizontal surface where the coefficient of kinetic friction between the two is 0.200.A string attached to the block is pulled horizontally,resulting in a 2-m/s² acceleration by the block.Find the tension in the string.(g = 9.80 m/s²)

An astronaut applies a force of 450 N to an asteroid,and it accelerates at 9.00 m/s².What is the asteroid's mass?

A 100-kg crate is placed on an adjustable inclined plane.If the crate slides down the incline with an acceleration of 0.20 m/s² when the incline angle is 20°,then what should the incline angle be for the crate to slide down the plane at constant speed? (g = 9.8 m/s²)

Two objects,A and B,are placed on an inclined plane that can be rotated to different angles of elevation.A starts to slide at twice the angle of elevation that B starts sliding.The respective coefficients for static friction for A and B are μ_A and μ_B.Choose the last answer that is correct.