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For straight-line motion, how does a speedometer indicate

Conceptual Physics | 12th Edition | ISBN: 9780321909107 | Authors: Paul G. Hewitt ISBN: 9780321909107 29

Solution for problem 9E Chapter 3

Conceptual Physics | 12th Edition

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Conceptual Physics | 12th Edition | ISBN: 9780321909107 | Authors: Paul G. Hewitt

Conceptual Physics | 12th Edition

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Problem 9E

For straight-line motion, how does a speedometer indicate whether or not acceleration is occurring?

Step-by-Step Solution:
Step 1 of 3

Solution 9E The acceleration is defined as the change in velocity with time. So the change can happen either by changing the direction or by changing the magnitude of the velocity. If an object is moving in a straight line, the direction of the object can not change. So in this case the acceleration only means the change in magnitude of the velocity. Now, since the magnitude of the velocity represents the speed, change in magnitude of the velocity means change in speed. Speedometer measures speed, that is it measure the magnitude of the velocity. So if there is any acceleration, the magnitude of the velocity, i.e. speed will change constantly. So the reading in the speedometer will change continuously. So a constantly changing reading of speedometer indicates the car is in acceleration.

Step 2 of 3

Chapter 3, Problem 9E is Solved
Step 3 of 3

Textbook: Conceptual Physics
Edition: 12
Author: Paul G. Hewitt
ISBN: 9780321909107

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For straight-line motion, how does a speedometer indicate