*79. ssm Suppose you are driving a car in a counterclockwise direc- tion on a circular road whose radius is r = 390 m (see the figure). You look at the speedometer and it reads a steady 32 m/s (about 72 mi/h). Con- cepts: (i) Does an object traveling at a constant tangential speed (for example, v, = 32 m/s) along a circular path have an acceleration? (ii) Is there a tangential acceleration a, when the angular speed of an object changes (e.g., when the car's angular speed decreases to 4.9 X 10-² rad/s)? Calculations: (a) What is the angular speed of the car? (b) Determine the acceleration (magnitude and direction) of the car. (c) To avoid a rear-end collision with the vehicle ahead, you apply the brakes and reduce your angular speed to 4.9 × 10-² rad/s in a time of 4.0 s. What is the tangential acceleration (magnitude and direction) of the car? 'T (decreasing) (a) Constant angular speed (b) Decreasing angular speed Problem 79

*79. ssm Suppose you are driving a car in a counterclockwise direc- tion on a circular road whose radius is r = 390 m (see the figure). You look at the speedometer and it reads a steady 32 m/s (about 72 mi/h). Con- cepts: (i) Does an object traveling at a constant tangential speed (for example, v, = 32 m/s) along a circular path have an acceleration? (ii) Is there a tangential acceleration a, when the angular speed of an object changes (e.g., when the car's angular speed decreases to 4.9 X 10-² rad/s)? Calculations: (a) What is the angular speed of the car? (b) Determine the acceleration (magnitude and direction) of the car. (c) To avoid a rear-end collision with the vehicle ahead, you apply the brakes and reduce your angular speed to 4.9 × 10-² rad/s in a time of 4.0 s. What is the tangential acceleration (magnitude and direction) of the car? 'T (decreasing) (a) Constant angular speed (b) Decreasing angular speed Problem 79

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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