Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (Chs 1-42) Plus Mastering Physics with Pearson eText -- Access Card Package (4th Edition)
4th Edition
ISBN: 9780133953145
Author: Randall D. Knight (Professor Emeritus)
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 6, Problem 42EAP
Seat belts and air bags save lives by reducing the forces exerted on the driver and passenger in an automobile collision. Cars are designed with a “crumple zone” in the front of the car. In the event of an impact, the passenger compartment decelerates over a distance of about 1 m as the front of the car crumples. An occupant restrained by seat belts and air bags decelerates with the car. By contrast, an unrestrained occupant keeps moving forward with no loss of speed (Newton's first law!) until hitting the dashboard or windshield. These are unyielding surfaces, and the unfortunate occupant then decelerates over a distance of only about 5 mm.
a. A 60 kg person is in a head-on collision. The car's speed at impact is 15 m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air bag deploys.
b. Estimate the net force that ultimately stops the person if he or she is not restrained by a seat belt or air bag.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
Seat belts and air bags save lives by reducing the forces exerted on
the driver and passengers in an automobile collision. Cars are
designed with a "crumple zone" in the front of the car. In the event of
an impact, the passenger compartment decelerates over a distance of
about 1 m as the front of the car crumples. An occupant restrained by
seat belts and air bags decelerates with the car. By contrast, an
unrestrained occupant keeps moving forward with no loss of speed
(Newton's first law!) until hitting the dashboard or windshield. These
are unyielding surfaces, and the unfortunate occupant then
decelerates over a distance of only about 5 mm.
Part A
A 62 kg person is in a head-on collision. The car's speed at impact is 13 m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air bag
deploys.
Express your answer with the appropriate units.
Part B
Estimate the net force that ultimately stops the person if he or she is not restrained by a seat belt or…
Seat belts and air bags save lives by reducing the forces
exerted on the driver and passengers in an automobile
collision. Cars are designed with a "crumple zone" in the front
of the car. In the event of an impact, the passenger
compartment decelerates over a distance of about 1 m as the
front of the car crumples. An occupant restrained by seat belts
and air bags decelerates with the car. By contrast, an
unrestrained occupant keeps moving forward with no loss of
speed (Newton's first law!) until hitting the dashboard or
windshield. These are unyielding surfaces, and the
unfortunate occupant then decelerates over a distance of only
about 5 mm.
Part A
A 65 kg person is in a head-on collision. The car's speed at impact is 12 m/s. Estimate the net force on the person if he or she is wearing a seat belt
and if the air bag deploys.
Express your answer with the appropriate units.
Fnet
=
Submit
Part B
Fret
☐
=
HÅ
Α
Value
Request Answer
Estimate the net force that ultimately stops the person if…
Seat belts and air bags save lives by reducing the forces exerted
on the driver and passengers in an automobile collision. Cars are
designed with a "crumple zone" in the front of the car. In the
event of an impact, the passenger compartment decelerates over
a distance of about 1 m as the front of the car crumples. An
occupant restrained by seat belts and air bags decelerates with
the car. By contrast, an unrestrained occupant keeps moving
forward with no loss of speed (Newton's first law!) until hitting the
dashboard or windshield. These are unyielding surfaces, and the
unfortunate occupant then decelerates over a distance of only
about 5 mm.
Part A
A 64 kg person is in a head-on collision. The car's speed at impact is 12 m/s. Estimate the net force on the person if he or she is wearing a seat belt and if
the air bag deploys.
Express your answer to two significant figures and include the appropriate units.
Fnet =
Submit
Part B
Fnet =
Submit
μÁ
Provide Feedback
Value
Request Answer…
Chapter 6 Solutions
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (Chs 1-42) Plus Mastering Physics with Pearson eText -- Access Card Package (4th Edition)
Ch. 6 - Are the objects described here in equilibrium...Ch. 6 - A ball tosses straight up has v = 0 at its highest...Ch. 6 - Kat, Matt, and Nat are arguing about why a physics...Ch. 6 - If you know all of the forces acting on a moving...Ch. 6 - An elevator, hanging from a single cable, moves...Ch. 6 - An elevator, hanging from a single cable, moves...Ch. 6 - Are the following statements true or false?...Ch. 6 -
8. An astronaut takes his bathroom scale to the...Ch. 6 -
9. The four balls in FIGURE Q6.9 have been...Ch. 6 - Prob. 10CQ
Ch. 6 - Prob. 11CQCh. 6 - A hand presses down on the book in FIGURE Q6.12....Ch. 6 - Boxes A and B in FIGURES Q6.13 both remain at...Ch. 6 - Suppose you push a hockey puck of mass m across...Ch. 6 - A block pushed along the floor with velocity...Ch. 6 - A crate of fragile dishes is in the back of a...Ch. 6 - Five balls move through the air as shown in FIGURE...Ch. 6 - The three ropes in FIGURE EX6.1 are tied to a...Ch. 6 - The three ropes in FIGURE EX6.2 are tied to a...Ch. 6 - A football coach sits on a sled while two of his...Ch. 6 - A 20 kg loudspeaker is suspended 2.0 m below the...Ch. 6 - A 65 kg gymnast wedges himself between two closely...Ch. 6 - A construction worker with a weight of 850 N...Ch. 6 - In an electricity experiment, a 1.0 g plastic ball...Ch. 6 - The forces in FIGURE EX6.8 act on a 2.0 kg object....Ch. 6 - The forces in FIGURE EX6.9 act on a 2.0 kg object....Ch. 6 - FIGURE EX6.10 shows the velocity graph of a 2.0 kg...Ch. 6 - FIGURE EX6.11 shows the force acting on a 2.0 kg...Ch. 6 - A horizontal rope is tied to a 50 kg box on...Ch. 6 - A 50 kg box hangs from a rope. What is the tension...Ch. 6 - A 2.0 × 107 kg train applies its brakes with the...Ch. 6 - A 8.0 × 104 kg spaceship is at rest in deep space....Ch. 6 - The position of a 2.0 kg mass is given by x = (2t3...Ch. 6 - A woman has mass of 55 kg. a. What is her weight...Ch. 6 - It takes the elevator in a skyscraper 4.0 s to...Ch. 6 - Zach, whose mass is 80 kg, is in an elevator...Ch. 6 - What thrust does a 200 g model rocket need in...Ch. 6 - What thrust does a 200 g model rocket need in...Ch. 6 - A 20,000 kg rocket has a rocket motor that...Ch. 6 - The earth is 1.50 × 1011 m from the sun. The...Ch. 6 - Bonnie and Clyde are sliding a 300 kg bank safe...Ch. 6 - A stubborn, 120 kg mule sits down and refuses to...Ch. 6 - A 10 kg crate is placed on a horizontal conveyor...Ch. 6 - Bob is pulling a 30 kg filing cabinet with a force...Ch. 6 - A rubber-wheeled kg cart rolls down a 15° concrete...Ch. 6 - A 4000 kg truck is parked on a 15° slope. How big...Ch. 6 - A 1500 kg car skids to a halt on a wet road where...Ch. 6 - A 50,000 kg locomotive is traveling at 10 m/s when...Ch. 6 - You and your friend Peter are putting new shingles...Ch. 6 - An Airbus A320 jetliner has a takeoff mass of...Ch. 6 -
34. A medium-sized jet has a 3.8-m-diameter...Ch. 6 - A 75 kg skydiver can be modeled as a rectangular...Ch. 6 - A 6.5-cm-diameter ball has a terminal speed of 26...Ch. 6 - A 2.0 kg object initially at rest at the origin is...Ch. 6 - A 5.0 kg object initially at rest at the origin is...Ch. 6 - The 1000 kg steel beam in FIGURE P6.39 is...Ch. 6 - Henry, whose mass is 95 kg, stands on a bathroom...Ch. 6 - An accident victim with a broken leg is being...Ch. 6 - Seat belts and air bags save lives by reducing the...Ch. 6 - The piston of a machine exerts a constant force on...Ch. 6 - Compressed air is used to fire a 50 g ball...Ch. 6 - a. A rocket of mass m is launched straight up with...Ch. 6 - A rifle with a barrel length of 60 cm fires a 10 g...Ch. 6 - A truck with a heavy load has a total mass of 7500...Ch. 6 - An object of mass m is at rest at the top of a...Ch. 6 - Prob. 49EAPCh. 6 - A baggage handler drops your 10 kg suitcase onto a...Ch. 6 - A 2.0 kg wood block is launched up a wooden ramp...Ch. 6 - It’s a snowy day and you're pulling a friend along...Ch. 6 - A large box of mass M is pulled across a...Ch. 6 - Prob. 54EAPCh. 6 - You're driving along at 25 m/s with your aunt's...Ch. 6 - The 2.0 kg wood box in FIGURE P6.56 slides down a...Ch. 6 - A 1.0 kg wood block is pressed against a vertical...Ch. 6 - A person with compromised pinch strength in his...Ch. 6 - A ball is shot from a compressed-air gun at twice...Ch. 6 - Starting from rest, a 2500 kg helicopter...Ch. 6 - Astronauts in space "weigh" themselves by...Ch. 6 - A particle of mass m moving along the x-axis...Ch. 6 - At t = 0, an object of mass m is at rest at x = 0...Ch. 6 - At t = 0, an object of mass m is at rest at x = 0...Ch. 6 - Prob. 65EAPCh. 6 - A 60 kg skater is gliding across frictionless ice...Ch. 6 - Prob. 67EAPCh. 6 - Problems 68 and 69 show a free-body diagram. For...Ch. 6 - Problems 68 and 69 show a free-body diagram. For...Ch. 6 - Prob. 70EAPCh. 6 - In Problems 70 through 72 you are given the...Ch. 6 - In Problems 70 through 72 you are given the...Ch. 6 - A block of mass m is at rest at the origin at t =...Ch. 6 - A spring-loaded toy gun exerts a variable force on...Ch. 6 - FIGURE CP6.7S shows an accelerometer, a device for...Ch. 6 - An object moving in a liquid experiences a linear...Ch. 6 - Prob. 77EAPCh. 6 - An object with cross section A is shot...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Seat belts and air bags save lives by reducing the forces exerted on the driver and passengers in an automobile collision. Cars are designed with a “crumple zone” in the front of the car. In the event of an impact, the passenger compartment decelerates over a distance of about 1 m as the front of the car crumples. An occupant restrained by seat belts and air bags decelerates with the car. By contrast, an unrestrained occupant keeps moving forward with no loss of speed (Newton’s first law!) until hitting the dashboard or windshield, as shown. These are unyielding surfaces, and the unfortunate occupant then decelerates over a distance of only about 5 mm. a. A 60 kg person is in a head-on collision. The car’s speed at impact is 15 m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air bag deploys.b. Estimate the net force that ultimately stops the person if he or she is not restrained by a seat belt or air bag.c. How do these two forces compare to the…arrow_forwardA 1700 kg car is driving down a highway at a constant velocity when a deer jumps out onto the road 59.6 m ahead. The coefficient of friction between the car tires and the road is 0.21. Calculate the initial velocity of the car if it is able to stop just before hitting the deer. (You do not need to account for reaction time of the driver. Assuming the car is breaking the entire 59.6 m distance and that friction is the only force stopping the car.) v0 = m/sarrow_forwardA 2110 kg car traveling at 8.4 m/s collides with a 2730kg car that is initially at rest at the stoplight. The cars stick together and move 3.30 m before friction causes them to stop. Determine the coefficient of kinetic friction between the cars and the road, assuming that the negative acceleration is constant and that all wheels on both cars lock at the time of impact.arrow_forward
- You go trick-or-treating with your friends and end up with more candy than you know what to do with. You get tired of carrying your pillowcase full of candy, so you start to drag it along the ground. Your pillowcase has a mass of 8.7 kg and the coefficient of kinetic friction between your pillowcase and the ground is 0.20. It's time to catch up to your friends, so you take off, still dragging the bag. You pull on the bag with a force of 62 N at an angle of 57 degrees above the horizontal. - What is the magnitude of the Normal force acting on the bag? - What is the magnitude of the kinetic friction force acting on the bag? - What is the net acceleration of the bag?arrow_forwardThe sport of American football often involves athletes running at high speeds and smashing into each other. While they wear protective pads and helmets, their bodies still experience large decelerations and forces. In fact, some of the collisions between players, or between a player and the ground, are comparable to what a person might endure in an automobile accident. In 2017, a large study found that 110 out of 111 deceased NFL players had chronic traumatic encephalopathy (CTE), a degenerative brain disorder associated with repetitive head trauma (see photo). Other studies have linked CTE to higher rates of early onset dementia and memory loss. Consider an NFL player running at 3.92 m/s. During a collision and tackle, his head is brought to a stop in a distance of 0.125 m. (a) Calculate the magnitude of the deceleration of the player's head (assume the deceleration to be constant and treat this as a one-dimensional problem). How does it compare to the acceleration of gravity near the…arrow_forwardThe 4-Mg bus A is traveling to the right at 30 m/s. Meanwhile a 1-Mg car B is traveling at 20 m/s to the left. If vehicles crash and become entangled, determine the distance the vehicles will slide before they stop. The coefficient of kinetic friction between vehicles' tire and the road is μι-0.7. VA = 30 m/s Vg = 20 m/s Barrow_forward
- A hockey puck struck by a hockey stick is given an initial speed v0 in the positive x -direction. The coefficient of kinetic friction between the ice and the puck is μk . (a) Obtain an expression for the acceleration of the puck. (b) Use the result of part (a) to obtain an expression for the distance d the puck slides. The answer should be in terms of the variables v0 μ,k , and g only.arrow_forwardThanks for the helparrow_forwardAn empty box is travelling on the conveyor with 0.2 m/s, then 12 kg package is dropped into this box with 1 m/s speed. When dropped, package and box are immediately sticked together. Friction coefficeient between the box and the conveyor is μk = 0.2 . After the package dropped, package and box start sliding on the conveyor for some distance, d for t(sliding) amount of time. Determine the distance, d.arrow_forward
- A hockey puck struck by a hockey stick is given an initial speed v0 in the positive x-direction. The coefficient of kinetic friction between the ice and the puck is μk. (a) Obtain an expression for the acceleration of the puck. (b) Use the result of part (a) to obtain an expression for the distance d the puck slides. The answer should be in terms of the variables v0μk, and g only.arrow_forwardA 3 kg and a 5 kg box rest side-by-side on a smooth, level floor. A horizontal force of 32 N is applied to the 3 kg box pushing it against the 5 kg box, and, as a result, both boxes slide along the floor. What is the magnitude of the contact force between the two boxes? Assume no friction.arrow_forwardThe lubrication of bone joints is a subject of ongoing medical research. Two bones connected at a joint do not touch. The bones are covered in articular cartilage, and are surrounded by lubricating synovial fluid. Rheumatoid arthritis results in overproduction of synovial fluid, swollen joints, and difficult and painful movement. Other joint disorders degrade the synovial fluid, directly increasing the friction between the bones, resulting in painful motion. The horizontal force F⃗h would rotate the femur head clockwise in the hip socket, but the frictional force f⃗f acts to prevent this clockwise rotation. The apparatus is designed such that when |F⃗h| > |f⃗f|, the femur head rotates clockwise. A sample of data collected at impending slippage of the femur is shown in the figure.(Figure 1). Based on these data, what is the approximate coefficient of static friction μs between the femur head and the hip socket? Enter your answer numerically to one significant figure.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning
University Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSON
Introduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Lecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-Wesley
College Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON
College Physics
Physics
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Cengage Learning
University Physics (14th Edition)
Physics
ISBN:9780133969290
Author:Hugh D. Young, Roger A. Freedman
Publisher:PEARSON
Introduction To Quantum Mechanics
Physics
ISBN:9781107189638
Author:Griffiths, David J., Schroeter, Darrell F.
Publisher:Cambridge University Press
Physics for Scientists and Engineers
Physics
ISBN:9781337553278
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Lecture- Tutorials for Introductory Astronomy
Physics
ISBN:9780321820464
Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden
Publisher:Addison-Wesley
College Physics: A Strategic Approach (4th Editio...
Physics
ISBN:9780134609034
Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher:PEARSON
Newton's First Law of Motion: Mass and Inertia; Author: Professor Dave explains;https://www.youtube.com/watch?v=1XSyyjcEHo0;License: Standard YouTube License, CC-BY