The earth takes one year to orbit the Sun at a distance of 1 . 5 × 10 11 m . Calculate the speed. Explain why this is its average speed and not its velocity.

Given the distance between the sun and the earth r = 1 . 5 × 10 11 m . The time of taking one complete orbit = T = 1 year = 365 × 24 × 60 × 60 = 31536000 = 3 . 1536 × 10 7 sec . Let us suppose the earth orbits the sun in a circular orbit the length of the path will be the circumference of the circle having its radius equal to the distance between the earth and the sun. The path length is 2 πr = 2 × 3 . 14 × 1 . 5 × 10 11 m = 9 . 4 × 10 11 m . The speed of the earth s = distance time = 9 . 4 × 10 11 3 . 1536 × 10 7 = 3 × 10 4 ms - 1 = 30 kms - 1 It is the average speed. Since the earth returns to its initial position after one year, the displacement of the earth is zero. Therefore, the average velocity of the earth during one year is also zero.

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Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 1 - Kinematics: Describing Motion>Questions

David Sang and Graham Jones Solutions for Chapter: Kinematics: Describing Motion, Exercise 7: Questions

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David Sang Physics Solutions for Exercise - David Sang and Graham Jones Solutions for Chapter: Kinematics: Describing Motion, Exercise 7: Questions

Attempt the practice questions on Chapter 1: Kinematics: Describing Motion, Exercise 7: Questions with hints and solutions to strengthen your understanding. Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access solutions are prepared by Experienced Embibe Experts.

Questions from David Sang and Graham Jones Solutions for Chapter: Kinematics: Describing Motion, Exercise 7: Questions with Hints & Solutions

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Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 1 - Kinematics: Describing Motion>Questions>Q 8

A submarine uses sonar to measure the depth of water below it. Reflected sound waves are detected $0.40 s$ after they were transmitted. How deep is the water.? Speed of sound in water= $1500 {ms}^{- 1}$

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Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 1 - Kinematics: Describing Motion>Questions>Q 9

The earth takes one year to orbitthe Sun at a distance of $1.5 \times 10^{11} m$ . Calculate the speed. Explain why this is its average speed and not its velocity.

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