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# Solutions for Chapter 9: Fundamentals of Physics: 9th Edition ## Full solutions for Fundamentals of Physics: | 9th Edition

ISBN: 9780470556535 Solutions for Chapter 9

Solutions for Chapter 9
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##### ISBN: 9780470556535

Summary of Chapter 9:

Every mechanical engineer hired as an expert witness to reconstruct a traffic accident uses physics. Every trainer who coaches a ballerina on how to leap uses physics. Indeed, analyzing complicated motion of any sort requires sim- plification via an understanding of physics. In this chapter we discuss how the complicated motion of a system of objects, such as a car or a ballerina, can be simplified if we determine a special point of the system- the center ofmass of that system. Here is a quick example. If you toss a ball into the air without much spin on the ball (Fig. 9-1a), its motion is simple-it follows a parabolic path, as we discussed in Chapter 4, and the ball can be treated as a particle. If, instead, you flip a baseball bat into the air (Fig. 9-1b), its motion is more complicated. Because every part of the bat moves differently, along paths of many different shapes, you cannot represent the bat as a particle. Instead, it is a system of particles each of which follows its own path through the air. However, the bat has one special point-the center of mass-that does move in a simple parabolic path. The other parts of the bat move around the center of mass. (To locate the center of mass, balance the bat on an outstretched fin- ger; the point is above your finger, on the bat's central axis.) You cannot make a career of flipping baseball bats into the air, but you can make a career of advising long-jumpers or dancers on how to leap properly into the air while either moving their arms and legs or rotating their torso. Your starting point would be the person's center of mass because of its simple motion.

Since 122 problems in chapter 9 have been answered, more than 95345 students have viewed full step-by-step solutions from this chapter. Fundamentals of Physics: was written by and is associated to the ISBN: 9780470556535. Chapter 9 includes 122 full step-by-step solutions. This textbook survival guide was created for the textbook: Fundamentals of Physics:, edition: 9. This expansive textbook survival guide covers the following chapters and their solutions.

Key Physics Terms and definitions covered in this textbook
• //

parallel

• any symbol

average (indicated by a bar over a symbol—e.g., v¯ is average velocity)

• °C

Celsius degree

• °F

Fahrenheit degree

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