10th Edition

ISBN: 9781337553278

Author: Raymond A. Serway, John W. Jewett

Publisher: Cengage Learning

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Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.

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Chapter 7, Problem 41AP

You have a new internship, where you are helping to design a new freight yard for the train station in your city. There will be a number of dead-end sidings where single cars can be stored until they are needed. To keep the cars from running off the tracks at the end of the siding, you have designed a combination of two coiled springs as illustrated in Figure P7.41. When a car moves to the right in the figure and strikes the springs, they exert a force to the left on the car to slow it down.

Both springs are described by Hooke’s law and have spring constants k₁ = 1 600 N/m and k₂ = 3 400 N/m. After the first spring compresses by a distance of d = 30.0 cm, the second spring acts with the first to increase the force to the left on the car in Figure P7.41. When the spring with spring constant k₂ compresses by 50.0 cm, the coils of both springs are pressed together, so that the springs can no longer compress. A typical car on the siding has a mass of 6 000 kg. When you present your design to your supervisor, he asks you for the maximum speed that a car can have and be stopped by your device.

Figure P7.41

Chapter 7, Problem 41AP, You have a new internship, where you are helping to design a new freight yard for the train station

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Chapter 7, Problem 40AP

Chapter 7, Problem 42AP

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Chapter 7 Solutions

Physics for Scientists and Engineers

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Solution Summary: The author calculates the maximum speed of the car that can be stopped by the spring device. The first spring is compressed by a distance of 30.0cm.

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