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Q10.

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Physics Principles with Applications
Found in: Page 43
Physics Principles with Applications

Physics Principles with Applications

Book edition 7th
Author(s) Douglas C. Giancoli
Pages 978 pages
ISBN 978-0321625922

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Short Answer

Every year, the earth travels about 109 km as it orbits the sun. What is the earth’s average speed in km/h?

The earth’s average speed is 1.14×105 kmh.

See the step by step solution

Step by Step Solution

TABLE OF CONTENTS :
TABLE OF CONTENTS

Step 1. Calculation of the total hours in one year

The earth’s orbit is a two-dimensional plane in which it rotates around the sun. The earth takes 365 days to complete one complete cycle in its orbit.

Given data.

The traveled distance of the earth in a year is 109 km.

Now, you know that there are 365 days in a year and 24 hours in a day. Then,

1 year=365 day=365 day×24 hour1 day=8760 hour

Step 2. Calculation of average speed

Now, you know that

Average speed=Total distanceTotal time=109 km8760 h=1.14×105 kmh

Therefore, the earth’s average speed is 1.4×105 kmh.

Most popular questions for Physics Textbooks

In the design of a rapid transit system, it is necessary to balance the average speed of a train against the distance between station stops. The more stops there are, the slower the train’s average speed. To get an idea of this problem, calculate the time it takes a train to make a 15.0-km trip in two situations: (a) the stations at which the trains must stop are 3.0 km apart (a total of 6 stations, including those at the ends); and (b) the stations are 5.0 km apart (4 stations total). Assume that at each station the train accelerates at a rate of 1.1 m/s2 until it reaches 95 km/h, then stays at this speed until its brakes are applied for arrival at the next station, at which time it decelerates at 2 m/s2. Assume it stops at each intermediate station for 22 s.

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Give an example where both the velocity and acceleration are negative.

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