Explanation Orbital speed is defined as the speed of the object such as planets, satellites or star with which it orbits around another massive objects. For example, all nine planets orbit around Sun with different orbital speed. Real rotation curve of MWG represents that the speed of the object increased for some distance and then it became constant for star A, Sun and star B irrespective of distance from the centre of galaxy. In the new ranking for the orbital speeds of Star A, Star B, and the Sun, all will be ranked same as orbital speed is constant so star A = Sun = starB . But according to Kepler’s law for orbital speed of the object, Orbital speed depends on the distance from the Sun, when the distance changes, orbital speed of the planet also changes, the planets which have strong gravitational pull moves faster than those which have less strong gravitational pull

Lecture- Tutorials for Introductory Astronomy

3rd Edition

ISBN: 9780321820464

Author: Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden

Publisher: Addison-Wesley

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Question

Chapter 5, Problem 12DAP

To determine

Using the real rotation curve for the MWG, provide a new ranking for the orbital speeds of Star A, Star B, and the Sun, from fastest to slowest also explain the differences between this ranking and the one observer provided in Question 8.

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Chapter 5, Problem 11DAP

Chapter 5, Problem 13DAP

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Lecture- Tutorials for Introductory Astronomy

Ch. 5 - Prob. 1HRP Ch. 5 - Prob. 2HRP Ch. 5 - Prob. 3HRP Ch. 5 - Prob. 4HRP Ch. 5 - Prob. 5HRP Ch. 5 - Prob. 6HRP Ch. 5 - Stars of the same spectral type have the same...Ch. 5 - Prob. 8HRP Ch. 5 - Prob. 9HRP Ch. 5 - Prob. 1STP

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