MOD.MASTERING PHYSICS 2 W/E-TEXT
2019th Edition
ISBN: 9780136477600
Author: Pearson
Publisher: INTER PEAR
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 5, Problem 59GP
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 we saw in Figure 4.2. 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 person’s weight?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
A mosquito flying 3 mph collides head-on with a car going 55mph in the opposite direction. Which of the following statements is true as a result of the collision?
a. The mosquito experiences the greater acceleration.
b. The car experiences the greater acceleration.
c. The mosquito experiences the greater impact force.
d. The car experiences the greater impact force.
In attempting to pass the puck to a teammate, a hockey player gives it an initial speed of 1.91 m/s. However, this speed is inadequate to compensate for the kinetic friction between the puck and the ice. As a result, the puck travels only one-half the distance between the players before sliding to a halt. What minimum initial speed should the puck have been given so that it reached the teammate, assuming that the same force of kinetic friction acted on the puck everywhere between the two players?
Two penguins, Wheezy and Mumble, are racing down an icy slope into the water below. Wheezy has a mass of 22 kg. Mumble has a mass of 25 kg. The slope is angled at eight degrees to the horizontal. They both start from the same position at the same time, and slide down the icy slope entirely due to gravity alone. There is a coefficient of kinetic friction of 0.12 between the penguins and the ice. Who wins the race and what is the winner's acceleration when they reach the finish line (ie the water)?
Chapter 5 Solutions
MOD.MASTERING PHYSICS 2 W/E-TEXT
Ch. 5 - An object is subject to two forces that do not...Ch. 5 - Are the objects described here in static...Ch. 5 - Prob. 3CQCh. 5 - Prob. 4CQCh. 5 - An astronaut takes his bathroom scale to the moon...Ch. 5 - A light block of mass m and a heavy block of mass...Ch. 5 - a. Can the normal force on an object be directed...Ch. 5 - A ball is thrown straight up. Taking the drag...Ch. 5 - You are going sledding with your friends, sliding...Ch. 5 - Suppose you are holding a box in front of you and...
Ch. 5 - You are walking up an icy slope. Suddenly your...Ch. 5 - Three objects move through the air as shown in...Ch. 5 - Prob. 13CQCh. 5 - Raindrops can fall at different speeds; some fall...Ch. 5 - An airplane moves through the air at a constant...Ch. 5 - Is it possible for an object to travel in air...Ch. 5 - For Questions 17 through 20, determine the tension...Ch. 5 - For Questions 17 through 20, determine the tension...Ch. 5 - For Questions 17 through 20, determine the tension...Ch. 5 - For Questions 17 through 20, determine the tension...Ch. 5 - In Figure Q5.21, block 2 is moving to the right....Ch. 5 - The wood block in Figure Q5.22 is at rest on a...Ch. 5 - Prob. 23MCQCh. 5 - Prob. 24MCQCh. 5 - Prob. 25MCQCh. 5 - While standing in a low tunnel, you raise your...Ch. 5 - A 5.0 kg dog sits on the floor of an elevator that...Ch. 5 - A 3.0 kg puck slides due east on a horizontal...Ch. 5 - Eric has a mass of 60 kg. He is standing on a...Ch. 5 - Prob. 30MCQCh. 5 - A football player at practice pushes a 60 kg...Ch. 5 - Two football players are pushing a 60 kg blocking...Ch. 5 - Land Rover ads used to claim that their vehicles...Ch. 5 - A truck is traveling at 30 m/s on a slippery road....Ch. 5 - The three ropes in Figure P5.1 are tied to a...Ch. 5 - Prob. 2PCh. 5 - Prob. 3PCh. 5 - A construction crew would like to support a 1000...Ch. 5 - When you bend your knee, the quadriceps muscle is...Ch. 5 - An early submersible craft for deep-sea...Ch. 5 - Prob. 7PCh. 5 - A 65 kg student is walking on a slackline, a...Ch. 5 - Prob. 9PCh. 5 - The forces in Figure P5.10 are acting on a 2.0 kg...Ch. 5 - The forces in Figure P5.11 are acting on a 2.0 kg...Ch. 5 - A horizontal rope is tied to a 50 kg box on...Ch. 5 - Prob. 13PCh. 5 - In a head-on collision, a car stops in 0.10 s from...Ch. 5 - An astronauts weight on earth is 800 N. What is...Ch. 5 - A woman has a mass of 55.0 kg. a. What is her...Ch. 5 - Prob. 17PCh. 5 - a. How much force does an 80 kg astronaut exert on...Ch. 5 - It takes the elevator in a skyscraper 4.0 s to...Ch. 5 - Riders on the Power Tower are launched skyward...Ch. 5 - Zach, whose mass is 80 kg, is in an elevator...Ch. 5 - Prob. 22PCh. 5 - Figure P5.23 shows the velocity graph of a 75 kg...Ch. 5 - Prob. 24PCh. 5 - A 23 kg child goes down a straight slide inclined...Ch. 5 - Prob. 26PCh. 5 - Two workers are sliding a 300 kg crate across the...Ch. 5 - A 4000 kg truck is parked on a 7.0 slope. How big...Ch. 5 - A 1000 kg car traveling at a speed of 40 m/s skids...Ch. 5 - It is friction that provides the force for a car...Ch. 5 - The rolling resistance for steel on steel is quite...Ch. 5 - Prob. 34PCh. 5 - Prob. 35PCh. 5 - Prob. 36PCh. 5 - Prob. 38PCh. 5 - Prob. 40PCh. 5 - A 1000 kg car pushes a 2000 kg truck that has a...Ch. 5 - A 2200 kg truck has put its front bumper against...Ch. 5 - Blocks with masses of 1.0 kg, 2.0 kg, and 3.0 kg...Ch. 5 - Prob. 44PCh. 5 - Prob. 45PCh. 5 - Prob. 46PCh. 5 - Each of 100 identical blocks sitting on a...Ch. 5 - A 500 kg piano is being lowered into position by a...Ch. 5 - Dana has a sports medal suspended by a long ribbon...Ch. 5 - Prob. 51GPCh. 5 - Your forehead can withstand a force of about 6.0...Ch. 5 - A 50 kg box hangs from a rope. What is the tension...Ch. 5 - Prob. 54GPCh. 5 - A 50 kg box hangs from a rope. What is the tension...Ch. 5 - A fisherman has caught a very large, 5.0 kg fish...Ch. 5 - Riders on the Tower of Doom, an amusement park...Ch. 5 - Prob. 58GPCh. 5 - Seat belts and air bags save lives by reducing the...Ch. 5 - Prob. 60GPCh. 5 - A 20,000 kg rocket has a rocket motor that...Ch. 5 - Youve always wondered about the acceleration of...Ch. 5 - Prob. 63GPCh. 5 - An impala is an African antelope capable of a...Ch. 5 - Josh starts his sled at the top of a 3.0-m-high...Ch. 5 - Prob. 67GPCh. 5 - Prob. 68GPCh. 5 - Prob. 69GPCh. 5 - Prob. 70GPCh. 5 - Prob. 71GPCh. 5 - Prob. 72GPCh. 5 - Prob. 73GPCh. 5 - Its possible for a determined group of people to...Ch. 5 - Prob. 75GPCh. 5 - Prob. 77GPCh. 5 - Prob. 79GPCh. 5 - Prob. 80GPCh. 5 - Prob. 82GPCh. 5 - Prob. 83GPCh. 5 - Prob. 84GPCh. 5 - MCAT-Style Passage Problems Sliding on the Ice In...Ch. 5 - MCAT-Style Passage Problems Sliding on the Ice In...Ch. 5 - MCAT-Style Passage Problems Sliding on the Ice In...Ch. 5 - MCAT-Style Passage Problems Sliding on the Ice In...
Additional Science Textbook Solutions
Find more solutions based on key concepts
(I)A car is driven 225 km west and then 98 km southwest (45º). What is the displacement of the car from the poi...
Physics: Principles with Applications
Using the definitions in Eqs. 1.1 and 1.4, and appropriate diagrams, show that the dot product and cross produc...
Introduction to Electrodynamics
On the smallest moon of Uranus, my team discovered a vast, subsurface ocean of liquid water.
Life in the Universe (4th Edition)
A copper wire of Length I is fashioned into a circular coil with N turns. When the magnetic field through the c...
University Physics Volume 2
The pV-diagram of the Carnot cycle.
Sears And Zemansky's University Physics With Modern Physics
How much evidence is there that Mars currently supports life or that it once supported life? What kind of evide...
Conceptual Integrated Science
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
- The velocities of m1 and m2 are V1 and V2 and it is V1>0 and V2<0 . The accelerations of the masses are a1, a2, a3. Ropes and pulleys are massless and frictionless. Solve the problem using the coordinate system given in the figure. For m1=m2=m3, plot a1 versus µ Hint : m1*a1=T-m1*µ(k) m2*a2= -T+ m2*g*µ(k) m3*a3= 2*T-m3*g 2*x3=x1-x2 => 2*a3=a1-a2arrow_forwardIn shot putting, many athletes elect to launch the shot at an angle that is smaller than the theoretical one (about 42) at which the distance of a projected ball at the same speed and height is greatest. One reason has to do with the speed the athlete can give the shot during the acceleration phase of the throw. Assume that a 7.260 kg shot is accelerated along a straight path of length 1.650 m by a constant applied force of magnitude 380.0 N, starting with an initial speed of 2.500 m/s (due to the athlete’s preliminary motion).What is the shot’s speed at the end of the acceleration phase if the angle between the path and the horizontal is (a) 30.00 and (b) 42.00? (Hint: Treat the motion as though it were along a ramp at the given angle.) (c) By what percent is the launch speed decreased if the athlete increases the angle from 30.00 to 42.00?arrow_forwardA system containing three objects, which is initially at rest, accelerates by the application of a net force. Masses and time dependent position vectors of objects are given as; m 1 =1 kg, m 2 = 5 kg, m 3 =7 kg r1→r1→ = (t 3 - 2)i^i^ + 2j^j^ r2→r2→ = (3 - t)i^i^+ 2j^j^ r3→r3→= 2i^i^+ (t - 4)j^j^ Find the magnitude of the net force of the system, F net, as time t=2 s. (Your result must be in Newtons. No need decimal place and no error is accepted in your answer.)arrow_forward
- Each of the seeds being blown off the head of a dandelion has a feathery structure called a pappus. The pappus acts like a parachute and enables the seed to be borne by the wind and drift gently to the ground. If a seed with its pappus descends straight down at a steady speed, which force acting on the seed has a greater magnitude?arrow_forwardIf a nonzero constant net external force acts on an object during a given period, which of the following statements must be true during that time? a. The object accelerates b. The magnitude of the object's velocity increases c. The acceleration of the object is increasing d. The object movesarrow_forwardA semi is traveling down the highway at a velocity of v = 39.5 m/s. The driver observes a wreck ahead, locks his brakes, and begins to slide. The truck has mass m and a coefficient of kinetic friction between the tires and the road of μk = 0.25. Write an expression for the sum of the forces in the x-direction for the truck while braking. Using the results from that input an expression for the trucks acceleration, ax, while braking. What is the magnitude of the acceleration in m/s^2, and how far does the truck travel, d in meters, before stopping?arrow_forward
- 15. Which is TRUE when the resultant of all the forces acting on the body is zero? Group of answer choices No answer The body is in equilibrium. The body has a constant velocity. The body has a constantly increasing acceleration. The body is acted upon only by the normal force.arrow_forwardA man is standing in a low-ceiling cave. He has raised his arms and pushing against the ceiling with a force of 300 N. His mass is 75 kg. What force does the ceiling exert on him? Question options: A) 250 N B) 100 N C) 500 N D) 200 N E) 300 Narrow_forwardA woodpecker's brain is protected from high accelerations, and thus large forces, by tendon-like attachments inside the skull. While pecking on a tree, a woodpecker's head comes to a stop from an initial speed of 0.62 m/s in a distance of only 1.5 mm. Part A: Assuming contact acceleration, find the magnitude of its head's acceleration in multiples of g (g=9.90 m/s^2). Part B: Calculate the stopping time of the woodpecker's head, in seconds. Part C: The tendons cradling the woodpecker's brain stretch, making the brain's stopping distance 4.4 mm which is greater than the head's stopping distance. That results in a lower magnitude of acceleration for the brain. What is the magnitude of the brain's acceleration, expressed in multiples of g?arrow_forward
- In a movie, a stuntman places himself on the vertical front of a truck as the truck accelerates. The coefficient of static friction between the stuntman and the truck is 0.370. The stuntman is not standing on anything but can “stick” to the front of the truck as long as the truck continues to accelerate. What minimum forward acceleration will keep the stuntman on the front of the truck?arrow_forwardA hockey puck (mass = 2 kg) leaves the players stick with a speed of 22 m/s and slides on the ice before coming to rest. The coefficient of friction between the puck and the ice is 0.9. What is the magnitude of the acceleration of the puck due to this friction force? m/s2 Tries 0/2arrow_forwardA rocket is launched vertically from the Earth, and the thrust (pushing force) from the engines is directed upward, and has a magnitude of 5.00 x 106N. The mass of the rocket is initially 2.00 x 105 kg.What is the initial acceleration of the rocket, assuming you can neglect air resistance? a 50.0 m/s2 b 15.2 m/s2 c 7.6 m/s2 d 25.0 m/s2arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers with Modern ...
Physics
ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
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