5th Edition

ISBN: 9780134296074

Author: GIANCOLI

Publisher: VST

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Chapter 2, Problem 81GP

Consider the street pattern shown in Fig. 2–47. Each intersection has a traffic signal, and the speed limit is 50 km/ h. Suppose you are driving from the west at the speed limit. When you are 10.0m from the first intersection, all the lights turn green. The lights are green for 13.0 s each. (a) Calculate the time needed to reach the third stoplight. Can you make it through all three lights without stopping? (b) Another car was stopped at the first light when all the lights turned green. It can accelerate at the rate of 2.00 m/s² to the speed limit. Can the second car make it through all three lights without stopping? By how many seconds would it make it or not?

Chapter 2, Problem 81GP, Consider the street pattern shown in Fig. 247. Each intersection has a traffic signal, and the speed

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Chapter 2, Problem 80GP

Chapter 2, Problem 82GP

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A person driving her car at 35 km/h approaches an inter- section just as the traffic light turns yellow. She knows that the yellow light lasts only 2.0s before turning to red, and she is 28 m away from the near side of the intersection (Fig. 2–49). Should she try to stop, or should she speed up to cross the intersection before the light turns red? The intersection is 15 m wide. Her car's maximum deceleration is -5.8 m/s?, whereas it can accelerate from 45 km/h to 65 km/h in 6.0 s. Ignore the length of her car and her reaction time. – 28 m - -15 m→ FIGURE 2-49 Problem 73.

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Chapter 2 Solutions

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