Chapter 4, Problem 1A

How can you be both at rest and also moving about 107,000 km/h at the same time?

To determine

To explain: The concept behind the person being at rest and at motion at the same time for the given speed.

Answer to Problem 1A

A person is moving relative to Sun while resting relative toEarth.

Explanation of Solution

Introduction:

Every object rest on Earth but it is continuously moving around the Sun. An object is said to be in motion, if its position relative to fixed point is changing.

Earth is moving around the Sun with a speed 10700 km/h. Earth takes 1 year to complete one rotation around the Sun. Suppose a man is resting on the Earth. But at the same time he is moving around the Sun. His relative speed with the Earth is zero but relative speed with respect to Sun will be 107000km/h.

Conclusion:

Therefore, person can be at rest as well as in motion at the same time.