Answer: The Global Positioning System (GPS) uses a constellation of some 30 satellites

Chapter 8, Problem 73

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The Global Positioning System (GPS) uses a constellation of some 30 satellites to provide accurate positioning for any point on Earth (Fig. 8.19). GPS receivers time radio signals traveling at the speed of light from three of the satellites to find the receivers position. Signals from one or more additional satellites provide corrections, eliminating the need for high-accuracy clocks in individual GPS receivers. GPS satellites are in circular orbits at 20,200 km altitude. Whats the approximate speed of GPS satellites? a. 9.8 m/s b. 500 m/s c. 1.7 km/s d. 4 km/s e. 12 km/s

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