Physics (5th Edition)
5th Edition
ISBN: 9780321976444
Author: James S. Walker
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 9, Problem 9PCE
Your car rolls slowly in a parking lot and bangs into the metal base of a light pole. In terms of safety. Is It better for your collision with the light polo to be elastic, inelastic, or is the safety risk the same for either case? Explain.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
1.Your car rolls slowly in a parking lot and bangs into the metal base of a light pole. In terms of safety, is it better for your collision with the light pole to be elastic, inelastic, or is the safety risk the same for either case? Explain and labled the problem.
Your forehead can withstand a force of about 6.0 kN before fracturing, while your cheekbone can withstand about 1.3 kN. If a 140 g baseball strikes your forehead at 25 m/s and stops in 1.7 ms, are you in danger of experiencing a fracture? What about if the ball hits your cheek instead?
Consider a positive sign convention for counterclockwise rotation and a negative sign convention for clockwise rotation. If the line of action of a force, F, exerted on an object intersects
the moment center, O, then the moment of F about point O is
O zero.
O one.
O positive.
O none of the choices
O negative.
Chapter 9 Solutions
Physics (5th Edition)
Ch. 9.1 - Enhance Your Understanding (Answers given at the...Ch. 9.2 - Enhance Your Understanding (Answers given at the...Ch. 9.3 - Enhance Your Understanding (Answers given at the...Ch. 9.4 - Enhance Your Understanding (Answers given at the...Ch. 9.5 - Prob. 5EYUCh. 9.6 - Enhance Your Understanding (Answers given at the...Ch. 9.7 - Enhance Your Understanding (Answers given at the...Ch. 9.8 - Prob. 8EYUCh. 9 - If you drop your Keys, their momentum increases as...Ch. 9 - By what factor does an objects kinetic energy...
Ch. 9 - A system of particles is known to have zero...Ch. 9 - A system of particles is known to have zero...Ch. 9 - On a calm day you connect an electric fan to a...Ch. 9 - Crash statistics show that it is safer to be...Ch. 9 - (a) As you approach a stoplight, you apply the...Ch. 9 - An object at rest on a frictionless surface is...Ch. 9 - (a) Can two objects on a horizontal frictionless...Ch. 9 - Two cars collide at an intersection. If the cars...Ch. 9 - At the instant a bullet is fired from a gun, the...Ch. 9 - Prob. 12CQCh. 9 - In the classic movie The Spirit of St. Louis,...Ch. 9 - A tall, slender drinking glass with a thin base is...Ch. 9 - Prob. 15CQCh. 9 - Prob. 16CQCh. 9 - What is the mass of a mallard duck whose speed is...Ch. 9 - (a) What is the magnitude of the momentum of a...Ch. 9 - A 54 kg person walks due north with a speed of 1.2...Ch. 9 - A 26.2-kg dog is running northward at 2.70 m/s,...Ch. 9 - Predict/Calculate Two air-track carts move toward...Ch. 9 - A 0.145-kg baseball is dropped from rest. If the...Ch. 9 - A 285-g ball falls vertically downward, hitting...Ch. 9 - Object 1 has a mass m1 and a velocity...Ch. 9 - Your car rolls slowly in a parking lot and bangs...Ch. 9 - Predict/Explain A net force of 200 N acts on a...Ch. 9 - Predict/Explain Referring to the previous...Ch. 9 - Predict/Explain Two identical cars, each traveling...Ch. 9 - Force A has a magnitude F and acts for the time t...Ch. 9 - Find the magnitude of the impulse delivered to a...Ch. 9 - A 0.45-kg croquet ball is initially at rest on the...Ch. 9 - When spiking a volleyball, a player changes the...Ch. 9 - Force Platform A force platform measures the...Ch. 9 - Air Bag Safety If a driver makes contact with a...Ch. 9 - To make a bounce pass, a player throws a 0.60-kg...Ch. 9 - BIO Concussion Impulse One study suggests that a...Ch. 9 - Predict/Calculate A 0.14-kg baseball moves toward...Ch. 9 - A player bounces a 0.43-kg soccer ball off her...Ch. 9 - Two ice skaters stand at rest in the center of an...Ch. 9 - A 0.042-kg pet lab mouse sits on a 0.35-kg...Ch. 9 - An object initially at rest breaks into two pieces...Ch. 9 - A 92-kg astronaut and a 1200-kg satellite are at...Ch. 9 - The recoil of a shotgun can be significant....Ch. 9 - A plate drops onto a smooth floor and shatters...Ch. 9 - Suppose the car in Example 9-13 has an initial...Ch. 9 - Two 78.5-kg hockey players skating at 4.47 m/s...Ch. 9 - An air-track cart with mass m1 = 0.32 kg and...Ch. 9 - Predict/Calculate A bullet with a mass of 4.0 g...Ch. 9 - BIO Concussion Recoil The human head can be...Ch. 9 - Two objects moving with a speed v travel in...Ch. 9 - In the apple-orange collision in Example 9-16,...Ch. 9 - A732-kg car stopped at an intersection is...Ch. 9 - The collision between a hammer and a nail can be...Ch. 9 - Predict/Calculate A charging bull elephant with a...Ch. 9 - Prob. 39PCECh. 9 - The three air carts shown in Figure 9-28 have...Ch. 9 - An air-track cart with mass m =0.25 kg and speed...Ch. 9 - Predict/Explain A stalactite in a cave has drops...Ch. 9 - Prob. 43PCECh. 9 - Find the x coordinate of the center of mass of the...Ch. 9 - Prob. 45PCECh. 9 - A pencil standing upright on its eraser end falls...Ch. 9 - Prob. 47PCECh. 9 - The location of the center of mass of the...Ch. 9 - The Center of Mass of Sulfur Dioxide Sulfur...Ch. 9 - Prob. 50PCECh. 9 - A 0 726-kg rope 2 00 meters long lies on a floor...Ch. 9 - Prob. 52PCECh. 9 - Prob. 53PCECh. 9 - Helicopter Thrust During a rescue operation, a...Ch. 9 - Rocks for a Rocket Engine A child sits in a wagon...Ch. 9 - A 57.8-kg person holding two 0.880-kg bricks...Ch. 9 - A fire hose can expel water at a rate of 9.5 kg/s...Ch. 9 - A 0 540-kg bucket rests on a scale Into this...Ch. 9 - Predict/Calculate Holding a long rope by its upper...Ch. 9 - CE Object A has a mass m, object B has a mass 2m,...Ch. 9 - CE Object A has a mass m, object B has a mass 4m,...Ch. 9 - CE A juggler performs a series of tricks with...Ch. 9 - A golfer attempts a birdie putt, sending the 0...Ch. 9 - Predict/Calculate Two trucks drive directly away...Ch. 9 - Prob. 65GPCh. 9 - A 1 35-kg block of wood sits at the edge of a...Ch. 9 - In a stunt, three people jump off a platform and...Ch. 9 - Predict/Calculate The carton of eggs shown in...Ch. 9 - The Force of a Storm During a severe storm in Palm...Ch. 9 - An experiment is performed in which two air carts...Ch. 9 - Figure 9-40 shows position-versus-time data from...Ch. 9 - To balance a 35.5-kg automobile tire and wheel, a...Ch. 9 - A hoop of mass M and radius R rests on a smooth,...Ch. 9 - Predict/Calculate A 63-kg canoeist stands in the...Ch. 9 - Prob. 75GPCh. 9 - A young hockey player stands at rest on the ice...Ch. 9 - Prob. 77GPCh. 9 - A 0.454-kg block is attached to a horizontal...Ch. 9 - BIO Escaping Octopus The giant Pacific octopus...Ch. 9 - Prob. 80GPCh. 9 - The three air carts shown in Figure 9-44 have...Ch. 9 - Unlimited Overhang Four identical textbooks, each...Ch. 9 - Consider a one-dimensional. head-on elastic...Ch. 9 - Two air carts of mass m1 = 0.84 kg and m2 = 0.42...Ch. 9 - Golden Earrings and the Golden Ratio A popular...Ch. 9 - Amplified Rebound Height Two small rubber balls...Ch. 9 - Predict/Calculate Weighing a Block on an Incline A...Ch. 9 - Predict/Calculate A uniform rope of length L and...Ch. 9 - Prob. 89PPCh. 9 - Prob. 90PPCh. 9 - Prob. 91PPCh. 9 - Prob. 92PPCh. 9 - Referring to Example 9-12 Suppose a bullet of mass...Ch. 9 - Referring to Example 9-12 A bullet with a mass m =...Ch. 9 - Referring to Example 9-19 Suppose that cart 1 has...Ch. 9 - Referring to Example 9-19 Suppose the two carts...
Additional Science Textbook Solutions
Find more solutions based on key concepts
17.5 You put a bottle of soft drink in a refrigerator and leave it until its temperature has dropped 10.0 K. Wh...
University Physics (14th Edition)
48. A –50 nC charged particle is in a uniform electric field = (1 0 V/m, east) An external force moves the par...
College Physics: A Strategic Approach (3rd Edition)
51. The total charge a battery can supply is rated in mA · h, the product of the current (in mA) and the time (...
College Physics: A Strategic Approach (4th Edition)
A thin flat nonconducting disk, with radius R0 and charge Q, has a hole with a radius R0/2 in its center. Find ...
Physics for Scientists and Engineers with Modern Physics
16. (II) It takes a force of 91.0 N to compress the spring of a toy popgun 0.175 m to "load” a 0.160-kg ball. W...
Physics: Principles with Applications
Description of Motion: Initially move away from the detector; maintain a constant negative acceleration.
Tutorials in Introductory Physics
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
- A rocket motor is undergoing a "bench test." It is attached to a fixed support by four large springs of constant 10^6 N/m. The motor burns fuel at a rate of 50 kg/s. When the motor is running the springs are observed to stretch 1.5 cm. Determine the exhaust speed of the burned fuel.arrow_forwardYou are riding in a car that crashes into a solid wall. The car comes to a complete stop without bouncing back. The car has a mass of 1500 kg and has a speed of 30 m/s before the crash (this is about 65 mi/hr). Consider the following two situations: I. You remain buckled into the seat and the seat remains attached to the center of the car. II. You are not buckled into your seat and you fly through the windshield and hit the wall. (a) Is the impulse the same in both cases?(b) Are the forces acting on you the same?(c) Using the words impulse, force, time, and momentum explain why one scenario is safer for you. Hint: Think about how the shape of the car changes when it hits the wall.arrow_forwardThe following figure shows the arrangement of three uniform square laminas and each lamina measures a= 45 cm on side and has mass m = 56.1 grams. What is the location of center of mass (Xcom, Ycom}? a a a a 3. 2.arrow_forward
- A pendulum of mass m and length is initially at rest at an angle 9. The pendulum then swings down and collides elastically with a stationary block of mass M. The block slides along the surface and eventually stops when it encounters a rough patch of length |Ad. Assume that m = 1.7kg, L = 0.80m, 0 = 67°, M = 2.8kg and Ad = 0.55m. a) Calculate the speed of the block immediately after the elastic collision. b) What is the coefficient of kinetic friction of the rough patch?arrow_forwardUse g = 10 m/s/s in the following problems. A). A 250 gram meter stick has a center of mass at the 50 cm mark. You place a pivot at the 50 cm mark and hang 100 grams at the 40 cm mark. How much mass must you hang at the 90 cm mark to balance the system? B). A 250 gram meter stick has a center of mass at the 50 cm mark. You place a pivot at the 50 cm mark, hang 100 grams at the 40 cm mark and hang 200 grams at the 30 cm mark. How much mass must you hang at the 90 cm mark to balance the system?arrow_forwardI keep getting this question wrong, my first answer was 0 m/s and my second was 3 m/s. Please help, thank you so much!! :)arrow_forward
- A high jumper has to jump over a bar that is 2.30m above the ground. If her center of mass is 0.82m above the ground at the point she jumps, and she just clears the bar moving at 0.65m/s, how fast was she moving when she jumped? Ignore air frictionarrow_forwardThere is a 32cm tall ramp on a table that is 45cm tall. The ramp has an incline of 42° to the horizontal. If you place a 521kg block at the end of the ramp, and then release another block that has a mass of 782kg from rest from the top of the ramp and the ramp exerts 2.5N of friction. The block also stick together after colliding and they fall off the table immediately after colliding. What is the blocks speed just after colliding and how far from the table do they land?arrow_forward> A crew Capsule is returning from the ISS, whose orbit is circular with radius Ro + 400 km. Prior to re-entry, the capsule will insert into a 200 km Coplanar parking orbit to validate a new safety. system. The crew execute a Hohmann transfer to change their orbit from that of the ISS to that of the parking orbit. Compute the phase angle Do at the time of Impulse 1. State answer in degrees.arrow_forward
- Determine the coordinates of the mass center of the body which is constructed of three pieces of uniform thin plates welded together. Answers: 1.9 b (X,Y,Z) = (i 2.9 b 1.0 b i IM ) barrow_forwardit ericalat wen aking eff und len Höpping is an efficient method of locomotion for the kagaroo (see the figure above). When the kangaroo is in the air, the Earth-kangaroo system has a combination of gravitational potential energy and kinetic energy. When the kangaroo lands, its Achilles tendons and the attached muscles stretch-a form of elastic potential energy. This elastic potential energy is used along with additional muscle tension to launch the kangaroo off the ground for the next hop. In the red kangaroo, more than 50% of the total energy used during each hop is recovered elastic potential energy. This is so efficient that the kangaroo's metabolic rate actually decreases slightly as its hopping speed increases from 8 km/h to 25 km/h. The horizontal and vertical force components exerted by a firm surface on a kangaroo's feet while it hops are shown in the fiqure below. The vertical force Ns on Ky vanes: when the kangaroo is not touching the surface S the force is zero, when it is…arrow_forwardA cube with the dimensions bxbxb and a mass, m, lies on a horizontal surface. The cube is subjected to the force of gravity and the friction coefficient between the cube and the surface, mu. If the cube is sliding without rotation, and the initial impulse, F, is given, use the work-energy principle to determine the distance the cube travels.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Physics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning
Physics for Scientists and Engineers, Technology ...
Physics
ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
College Physics
Physics
ISBN:9781285737027
Author:Raymond A. Serway, Chris Vuille
Publisher:Cengage Learning
Elastic and Inelastic Collisions; Author: Professor Dave Explains;https://www.youtube.com/watch?v=M2xnGcaaAi4;License: Standard YouTube License, CC-BY