Question 1

A 15.00-kg bowling ball falls from a 3.00-m shelf.Just before hitting the floor,what will be its kinetic energy? (g = 9.80 m/s2 and assume air resistance is negligible)

Accepted Answer

A)  450 J 
B)  68 J 
C)  5 J 
D)  441 J 
E)  ​45 J 
A)  450 J 
B)  68 J 
C)  5 J 
D)  441 J 
E)  ​45 J

Question 2

The quantity of work equal to one joule is also equivalent to which of the following?

Accepted Answer

A)  watt 
B)  watt /s 
C)  watt ⋅ s 
D)  watt /s2 
A)  watt 
B)  watt /s 
C)  watt ⋅ s 
D)  watt /s2

Question 3

The unit of power,watt,is dimensionally the same as:

Accepted Answer

A)  joule-second. 
B)  joule/second. 
C)  joule-meter. 
D)  joule/meter. 
A)  joule-second. 
B)  joule/second. 
C)  joule-meter. 
D)  joule/meter.

Question 4

A hill is 200 m long and makes an angle of 12° with the horizontal.As a 65-kg jogger runs up the hill,how much work does gravity do on the jogger?

Accepted Answer

A)  127,400 J 
B)  26,488 J 
C)  −26,488 J 
D)  ​124,616 J 
E)  ​zero 
A)  127,400 J 
B)  26,488 J 
C)  −26,488 J 
D)  ​124,616 J 
E)  ​zero

Question 5

Which of the following is that form of energy associated with an object's location in a conservative force field?

Accepted Answer

A)  potential 
B)  thermal 
C)  bio-chemical 
D)  kinetic 
A)  potential 
B)  thermal 
C)  bio-chemical 
D)  kinetic

Question 6

What is the kinetic energy of a 0.155-kg baseball thrown at 50.0 m/s (112 mph)?

Accepted Answer

A)  387.5 J 
B)  3.875 J 
C)  193.75 J 
D)  7.75 J 
E)  ​0.005 J 
A)  387.5 J 
B)  3.875 J 
C)  193.75 J 
D)  7.75 J 
E)  ​0.005 J

Question 7

An 80,000-kg airliner is flying at 900 km/h at a height of 10.0 km.What is its total energy (kinetic + potential)if the total was 0 when the airliner was at rest on the ground?

Accepted Answer

A)  40,240 MJ 
B)  32,408 MJ 
C)  7,850 MJ 
D)  zero 
E)  ​10,340 MJ 
A)  40,240 MJ 
B)  32,408 MJ 
C)  7,850 MJ 
D)  zero 
E)  ​10,340 MJ

Question 8

A simple pendulum,1.00 m in length,is released from rest when the support string is at an angle of 20.0° from the vertical.What is the speed of the suspended mass at the bottom of the swing? (g = 9.80 m/s2 and ignore air resistance)

Accepted Answer

A)  4.43 m/s 
B)  2.59 m/s 
C)  1.18 m/s 
D)  1.09 m/s 
E)  ​0.3 m/s 
A)  4.43 m/s 
B)  2.59 m/s 
C)  1.18 m/s 
D)  1.09 m/s 
E)  ​0.3 m/s

Question 9

A 40-N crate is pulled up a 4-m inclined plane by a worker at constant velocity.If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 10 N between the crate and the surface,what is the force applied by the worker?

Accepted Answer

A)  zero 
B)  14 N 
C)  24 N 
D)  34 N 
E)  ​136 N 
A)  zero 
B)  14 N 
C)  24 N 
D)  34 N 
E)  ​136 N

Question 10

A bobsled makes a run down an ice track starting at 150 m vertical distance up the hill.If there is no friction,what is the velocity at the bottom of the hill?

Accepted Answer

A)  27 m/s 
B)  38 m/s 
C)  36 m/s 
D)  54 m/s 
E)  ​45 m/s 
A)  27 m/s 
B)  38 m/s 
C)  36 m/s 
D)  54 m/s 
E)  ​45 m/s

Question 11

A force of 100 N is applied to a 50-kg mass in the direction of motion for a distance of 6.0 m and then the force is increased to 180 N for the next 4.0 m.For the 10 m of travel,how much work is done by the varying force?

Accepted Answer

A)  1 320 J 
B)  1 480 J 
C)  66 000 J 
D)  26.4 J 
E)  ​1 220 J 
A)  1 320 J 
B)  1 480 J 
C)  66 000 J 
D)  26.4 J 
E)  ​1 220 J

Question 12

What is the minimum amount of energy required for an 60-kg climber carrying a 5-kg pack to climb Mt.Everest,8,150 m high?

Accepted Answer

A)  5.19 MJ 
B)  4.39 MJ 
C)  4.79 MJ 
D)  0.53 MJ 
E)  ​0.45 MJ 
A)  5.19 MJ 
B)  4.39 MJ 
C)  4.79 MJ 
D)  0.53 MJ 
E)  ​0.45 MJ

Question 13

An automobile delivers 35.0 hp to its wheels when moving at a constant speed of 21.0 m/s.What is the resistance force on the automobile at this speed? (1 hp = 746 watts)

Accepted Answer

A)  548 310 N 
B)  1 250 N 
C)  1 240 N 
D)  1 190 N 
E)  ​450 N 
A)  548 310 N 
B)  1 250 N 
C)  1 240 N 
D)  1 190 N 
E)  ​450 N

Question 14

The area under the force vs.displacement curve represents:

Accepted Answer

A)  area. 
B)  force. 
C)  work. 
D)  coefficient of static friction. 
A)  area. 
B)  force. 
C)  work. 
D)  coefficient of static friction.

Question 15

An amount of work equal to 2.5 J is required to compress the spring in a spring-gun.What is the "launch speed" of a 25-g marble?

Accepted Answer

A)  14 m/s 
B)  15 m/s 
C)  10 m/s 
D)  4 m/s 
E)  ​0.45 m/s 
A)  14 m/s 
B)  15 m/s 
C)  10 m/s 
D)  4 m/s 
E)  ​0.45 m/s

Question 16

A Hooke's law spring is compressed 15.0 cm from equilibrium,and the potential energy stored is 73.0 J.What compression (as measured from equilibrium)would result in 100 J being stored in this case?

Accepted Answer

A)  12.4 cm 
B)  17.6 cm 
C)  45.3 cm 
D)  ​35.2 cm 
E)  ​No answer is correct. 
A)  12.4 cm 
B)  17.6 cm 
C)  45.3 cm 
D)  ​35.2 cm 
E)  ​No answer is correct.

Question 17

A baseball outfielder throws a baseball of mass 0.20 kg at a speed of 50 m/s and initial angle of 30°.What is the kinetic energy of the baseball at the highest point of the trajectory? Ignore air friction.

Accepted Answer

A)  zero 
B)  375 J 
C)  188 J 
D)  62 J 
E)  ​250 J 
A)  zero 
B)  375 J 
C)  188 J 
D)  62 J 
E)  ​250 J

Question 18

A Hooke's law spring is mounted horizontally over a frictionless surface.The spring is then compressed a distance d and is used to launch a mass m along the frictionless surface.What compression of the spring would result in the mass attaining double the speed received in the above situation?

Accepted Answer

A)  1.41 d 
B)  1.73 d 
C)  2.00 d 
D)  4.00 d 
A)  1.41 d 
B)  1.73 d 
C)  2.00 d 
D)  4.00 d

Question 19

A 24-N crate starting at rest slides down a rough 4-m long ramp,inclined at 29° with the horizontal.20 J of energy is lost to friction.What will be the speed of the crate at the bottom of the incline?

Accepted Answer

A)  11.4 m/s 
B)  3.3 m/s 
C)  1.5 m/s 
D)  4.7 m/s 
E)  ​21.6 m/s 
A)  11.4 m/s 
B)  3.3 m/s 
C)  1.5 m/s 
D)  4.7 m/s 
E)  ​21.6 m/s

Question 20

A simple pendulum,2.0 m in length,is released by a push when the support string is at an angle of 25° from the vertical.If the initial speed of the suspended mass is 1.3 m/s when at the release point,to what maximum angle will it move in the second half of its swing?

Accepted Answer

A)  37° 
B)  30° 
C)  27° 
D)  21° 
E)  ​180° 
A)  37° 
B)  30° 
C)  27° 
D)  21° 
E)  ​180°

Exam 5: Energy

A 15.00-kg bowling ball falls from a 3.00-m shelf.Just before hitting the floor,what will be its kinetic energy? (g = 9.80 m/s2 and assume air resistance is negligible)

The quantity of work equal to one joule is also equivalent to which of the following?

The unit of power,watt,is dimensionally the same as:

A hill is 200 m long and makes an angle of 12° with the horizontal.As a 65-kg jogger runs up the hill,how much work does gravity do on the jogger?

Which of the following is that form of energy associated with an object's location in a conservative force field?

What is the kinetic energy of a 0.155-kg baseball thrown at 50.0 m/s (112 mph)?

An 80,000-kg airliner is flying at 900 km/h at a height of 10.0 km.What is its total energy (kinetic + potential)if the total was 0 when the airliner was at rest on the ground?

A simple pendulum,1.00 m in length,is released from rest when the support string is at an angle of 20.0° from the vertical.What is the speed of the suspended mass at the bottom of the swing? (g = 9.80 m/s2 and ignore air resistance)

A 40-N crate is pulled up a 4-m inclined plane by a worker at constant velocity.If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 10 N between the crate and the surface,what is the force applied by the worker?

A bobsled makes a run down an ice track starting at 150 m vertical distance up the hill.If there is no friction,what is the velocity at the bottom of the hill?

A force of 100 N is applied to a 50-kg mass in the direction of motion for a distance of 6.0 m and then the force is increased to 180 N for the next 4.0 m.For the 10 m of travel,how much work is done by the varying force?

What is the minimum amount of energy required for an 60-kg climber carrying a 5-kg pack to climb Mt.Everest,8,150 m high?

An automobile delivers 35.0 hp to its wheels when moving at a constant speed of 21.0 m/s.What is the resistance force on the automobile at this speed? (1 hp = 746 watts)

The area under the force vs.displacement curve represents:

An amount of work equal to 2.5 J is required to compress the spring in a spring-gun.What is the "launch speed" of a 25-g marble?

A Hooke's law spring is compressed 15.0 cm from equilibrium,and the potential energy stored is 73.0 J.What compression (as measured from equilibrium)would result in 100 J being stored in this case?

A baseball outfielder throws a baseball of mass 0.20 kg at a speed of 50 m/s and initial angle of 30°.What is the kinetic energy of the baseball at the highest point of the trajectory? Ignore air friction.

A Hooke's law spring is mounted horizontally over a frictionless surface.The spring is then compressed a distance d and is used to launch a mass m along the frictionless surface.What compression of the spring would result in the mass attaining double the speed received in the above situation?

A 24-N crate starting at rest slides down a rough 4-m long ramp,inclined at 29° with the horizontal.20 J of energy is lost to friction.What will be the speed of the crate at the bottom of the incline?

A simple pendulum,2.0 m in length,is released by a push when the support string is at an angle of 25° from the vertical.If the initial speed of the suspended mass is 1.3 m/s when at the release point,to what maximum angle will it move in the second half of its swing?

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

The Laws of Motion: Part A

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

A 15.00-kg bowling ball falls from a 3.00-m shelf.Just before hitting the floor,what will be its kinetic energy? (g = 9.80 m/s² and assume air resistance is negligible)

A simple pendulum,1.00 m in length,is released from rest when the support string is at an angle of 20.0° from the vertical.What is the speed of the suspended mass at the bottom of the swing? (g = 9.80 m/s² and ignore air resistance)