A person driving on I-82 glanced at his phone to read a very important text message. When he looked back up at the road, he saw that the traffic ahead had come to a standstill and he immediately slammed on his brakes. His car created 96.5 m long skid marks before rear-ending another car. Unfortunately, a passenger in the rear-ended car was seriously injured, thus requiring an investigation by the State Patrol. The State Patrol has no proof of distracted driving, however they want to determine if a citation for speeding should be issued. A State Patrol investigator used a 3.9 kg drag sled to determine the coefficient of kinetic friction between the road and the tires of the car. The drag sled's spring scale read 28 N when it was pulled along the ground at a constant speed. Use Newton's Second Law and kinematics to estimate the minimum value of the car's speed when the driver locked the brakes. (answer: about 83 mi/hr)

A person driving on I-82 glanced at his phone to read a very important text message. When he looked back up at the road, he saw that the traffic ahead had come to a standstill and he immediately slammed on his brakes. His car created 96.5 m long skid marks before rear-ending another car. Unfortunately, a passenger in the rear-ended car was seriously injured, thus requiring an investigation by the State Patrol. The State Patrol has no proof of distracted driving, however they want to determine if a citation for speeding should be issued. A State Patrol investigator used a 3.9 kg drag sled to determine the coefficient of kinetic friction between the road and the tires of the car. The drag sled's spring scale read 28 N when it was pulled along the ground at a constant speed. Use Newton's Second Law and kinematics to estimate the minimum value of the car's speed when the driver locked the brakes. (answer: about 83 mi/hr)

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Description: A person driving on I-82 glanced at his phone to read a very important text message. When he looked back up at theroad, he saw that the traffic ahead had come to a standstill and he immediately slammed on his brakes. His car created96.5 m long skid

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Displacement, Velocity and Acceleration

In classical mechanics, kinematics deals with the motion of a particle. It deals only with the position, velocity, acceleration, and displacement of a particle. It has no concern about the source of motion.

Linear Displacement

The term "displacement" refers to when something shifts away from its original "location," and "linear" refers to a straight line. As a result, “Linear Displacement” can be described as the movement of an object in a straight line along a single axis, for example, from side to side or up and down. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Linear displacement is usually measured in millimeters or inches and may be positive or negative.

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Question

A person driving on I-82 glanced at his phone to read a very important text message. When he looked back up at the
road, he saw that the traffic ahead had come to a standstill and he immediately slammed on his brakes. His car created
96.5 m long skid marks before rear-ending another car. Unfortunately, a passenger in the rear-ended car was seriously
injured, thus requiring an investigation by the State Patrol. The State Patrol has no proof of distracted driving, however
they want to determine if a citation for speeding should be issued.
A State Patrol investigator used a 3.9 kg drag sled to determine the coefficient of kinetic friction between the road and
the tires of the car. The drag sled's spring scale read 28 N when it was pulled along the ground at a constant speed.
Use Newton's Second Law and kinematics to estimate the minimum value of the car's speed when the driver locked
the brakes. (answer: about 83 mi/hr)
Note: You do not need the mass of the car to answer this question.
FNET = ma
fkx = μxN
W = mg g = 9.81 m/s²
v² = v₁² + 2a4x
1 mi/hr = 0.45 m/s
ww

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