COLLEGE PHYSICS VOL.2 W/ACCESS >C<
COLLEGE PHYSICS VOL.2 W/ACCESS >C<
16th Edition
ISBN: 9781323273661
Author: YOUNG
Publisher: Pearson Custom Publishing
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Textbook Question
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Chapter 3, Problem 1CQ

A teacher stands in the middle of a parking lot and watches a small child peddle a tricycle around the lot. At time t = 0, the child is due north of the teacher, traveling west. Thirty seconds later, the child is due west of the teacher, traveling south. What are the directions of the child’s (a) displacement, (b) average velocity, and (c) average acceleration? Express your answers in terms of these general directions: N of W, S of W, N of E, and S of E.

(a)

Expert Solution
Check Mark
To determine

The direction of child’s displacement.

Answer to Problem 1CQ

The direction of child’s displacement is SofW.

Explanation of Solution

The free body diagram is given below.

COLLEGE PHYSICS VOL.2 W/ACCESS >C<, Chapter 3, Problem 1CQ , additional homework tip  1

Displacement is the shortest distance between the initial and final positions. It is equal to the line joining the two points corresponding to child’s motion is the displacement. Therefore, the displacement is directed along south of west.

(b)

Expert Solution
Check Mark
To determine

The direction of child’s average velocity.

Answer to Problem 1CQ

The direction of child’s average velocity is SofW.

Explanation of Solution

The free body diagram is given below.

COLLEGE PHYSICS VOL.2 W/ACCESS >C<, Chapter 3, Problem 1CQ , additional homework tip  2

Average velocity is defined as the rate of change of displacement. It’s direction is same as that of displacement. Therefore, the average velocity is directed along south of west.

(c)

Expert Solution
Check Mark
To determine

The direction of child’s average acceleration.

Answer to Problem 1CQ

The direction of child’s average acceleration is SofE.

Explanation of Solution

The free body diagram is given below.

COLLEGE PHYSICS VOL.2 W/ACCESS >C<, Chapter 3, Problem 1CQ , additional homework tip  3

Average acceleration is defined as the rate of change of velocity. It’s direction is perpendicular to the line of displacement. Therefore, the average acceleration is directed along south of east.

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Chapter 3 Solutions

COLLEGE PHYSICS VOL.2 W/ACCESS >C<

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