Conceptual Physics (12th Edition)
Conceptual Physics (12th Edition)
12th Edition
ISBN: 9780321909107
Author: Paul G. Hewitt
Publisher: PEARSON
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Chapter 3, Problem 1RCQ

As you read this in your chair, how fast are you moving relative to the chair? Relative to the Sun?

Expert Solution & Answer
Check Mark
To determine

The speed of the person sitting on the chair relative to the chair and relative to Earth.

Answer to Problem 1RCQ

Solution:

Relative to the chair, the speed is zero.

Relative to the Sun, the speed is 107000 km/hr.

Explanation of Solution

Given Info: A person sitting on chair.

When we describe motion, we describe it relative to some other reference object.Since the person is sitting on the chair, and is not moving relative to the chair, therefore the relative speed of the person with respect to the chair is zero.

Average distance between Sun and Earth is r=149600000 km.

Distance by Earth in a year D=2π×r

Plugging the values in the above equation

D=2π×149600000km

The speed of Earth relative to the Sun is calculated as

2π×149600000365×24=107000km/hr

This is the speed of the Earth when it moves around the Sun. If a person is sitting on the chair, it can be said that he is on Earth. So, he will also have the same speed as that of the Earth, therefore the relative speed of the person with respect to the Sun is 107000 km/hr.

Conclusion:

The relative speed of the person with respect to chair is 0.

The relative speed of the person with respect to Sun is 107000 km/hr.

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Chapter 3 Solutions

Conceptual Physics (12th Edition)

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