(b) Construct a logical argument as to why Rubin concluded that much of the mass
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Question
(b) Construct a logical argument as to why Rubin concluded that much of the mass of a galaxy is not visible to us. Reason from principles discussed in Chapter 5, and your analysis of part (a). Which of the following statements are correct elements of a logical argument supporting Rubin's conclusion? (Select all that apply.)Rubin observed that the orbital speed increased rapidly with increasing r. Rubin assumed that Newton's gravitational force law is valid even for large galactic distances. If most of the mass is at the center of the galaxy, you predicted in part (a) that the orbital speed should vary with r. Most of the visible matter is in the center of the galaxy. Since the assumption that most of the mass is at the center of the galaxy gives a result that is inconsistent with Rubin's observations (little variation of v with r), it must be that there is lots of invisible mass, which is not at the center of the galaxy. Rubin observed that the outer regions of the galaxy were about as bright as the central region. (b) Construct a logical argument as to why Rubin concluded that much of the mass of a galaxy is not visible to us. Reason from principles discussed in Chapter 5, and your analysis of part (a). Which of the following statements are correct elements of a logical argument supporting Rubin's conclusion? (Select all that apply.) Rubin observed that the orbital speed increased rapidly with increasing r. Rubin assumed that Newton's gravitational force law is valid even for large galactic distances. If most of the mass is at the center of the galaxy, you predicted in part (a) that the orbital speed should vary with r. Most of the visible matter is in the center of the galaxy. Since the assumption that most of the mass is at the center of the galaxy gives a result that is inconsistent with Rubin's observations (little variation of v with r), it must be that there is lots of invisible mass, which is not at the center of the galaxy. Rubin observed that the outer regions of the galaxy were about as bright as the central region. Rubin observed that the orbital speed increased rapidly with increasing r. Rubin assumed that Newton's gravitational force law is valid even for large galactic distances. If most of the mass is at the center of the galaxy, you predicted in part (a) that the orbital speed should vary with r. Most of the visible matter is in the center of the galaxy. Since the assumption that most of the mass is at the center of the galaxy gives a result that is inconsistent with Rubin's observations (little variation of v with r), it must be that there is lots of invisible mass, which is not at the center of the galaxy. Rubin observed that the outer regions of the galaxy were about as bright as the central region.
Explanation / Answer
This question is fairly easy, think before you ask.
the correct answer for part B should be:
1,Most of the visible matter is in the center of the galaxy.
2,Rubin assumed that Newton's gravitational force law is valid even for large galactic distances.
3,Since the assumption that most of the mass is at the center of the galaxy gives a result that is inconsistent with Rubin's observations (little variation of v with r), it must be that there is lots of invisible mass, which is not at the center of the galaxy.
4,If most of the mass is at the center of the galaxy, you predicted in part (a) that the orbital speed should vary with r.
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