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Physics For Scientists & Engineers
Found in: Page 50
Physics For Scientists & Engineers

Physics For Scientists & Engineers

Book edition 9th Edition
Author(s) Raymond A. Serway, John W. Jewett
Pages 1624 pages
ISBN 9781133947271

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Short Answer

Try the following experiment away from traffic where you can do it safely. With the car you are driving moving slowly on a straight, level road, shift the transmission into neutral and let the car coast. At the moment the car comes to a complete stop, step hard on the brake and notice what you feel. Now repeat the same experiment on a fairly gentle, uphill slope. Explain the difference in what a person riding in the car feels in the two cases. (Brian Popp suggested the idea for this question.)

A person does not feel pushed inside a car when the brake is slammed at zero speed on a level road. But, a person is flung backwards against his seat if the brakes are slammed at zero speed on an upward incline.

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Step by Step Solution

TABLE OF CONTENTS :
TABLE OF CONTENTS

Step 1: Define acceleration.

The rate of change of the velocity of an object with respect to time is known as acceleration.

Step 2: Explain the two cases of riding in a car.

A person does not feel pushed inside a car when brakes are slammed at zero speed on a level road. As the car coasts to a stop, the forces of the rolling resistance and air resistance reduces to zero, so the car's acceleration is zero at that moment and even in the future. Whereas, a person is flung backwards against his if the brakes are slammed at zero speed on an upward incline. This is because, if the brakes are not stepped on, the car will accelerate downhill before, during, and after the zero speed instant.

Most popular questions for Physics Textbooks

Try the following experiment away from traffic where you can do it safely. With the car you are driving moving slowly on a straight, level road, shift the transmission into neutral and let the car coast. At the moment the car comes to a complete stop, step hard on the brake and notice what you feel. Now repeat the same experiment on a fairly gentle, uphill slope. Explain the difference in what a person riding in the car feels in the two cases. (Brian Popp suggested the idea for this question.)

On another planet, a marble is released from rest at the top of a high cliff. It falls 4.00 m in the first 1 s of its motion. Through what additional distance does it fall in the next 1s ? (a) 4.00 m (b) 8.00 m (c) 12.0 m (d) 16.0 m (e) 20.0 m

Each of the strobe photographs (a), (b), and (c) in Figure OQ2.18 was taken of a single disk moving toward the right, which we take as the positive direction. Within each photograph, the time interval between images is constant.

(i) Which photograph shows motion with zero acceleration?

(ii) Which photograph shows motion with positive acceleration?

(iii) Which photograph shows motion with negative acceleration?

A skateboarder starts from rest and moves down a hill with constant acceleration in a straight line, traveling for 6 s. In a second trial, he starts from rest and moves along the same straight line with the same acceleration for only 2 s. How does his displacement from his starting point in this second trial compare with that from the first trial? (a) one-third as large (b) three times larger (c) one-ninth as large (d) nine times larger (e) 1/3times as large.

An object is at x=0 at t=0 and moves along the x axis according to the velocity-time graph in Figure P2.62 .

(a) What is the object's acceleration between 0 and 4.0s ?

(b) What is the object's acceleration between 4.0s and 9.0s ?

(c) What is the object's acceleration between 13.0s and 18.0s ?

(d) At what time(s) is the object moving with the lowest speed?

(e) At what time is the object farthest from x=0 ?

(f) What is the final position x of the object at t=18.0s ?

(g) Through what total distance has the object moved between t=0 and t=18.0s ?
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