HW3-2 - replaced by a black hole with the same mass? Why?...

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Physics 120 Homework Set #3 Due Friday April 9 at 1:25pm 1. If the Sun were to collapse and to form a black hole, the radius of this back hole would be about 3 km. Suppose all the mass of the galaxy were to suddenly collapse together to form a hypermassive black hole. Knowing that the radius of a black hole is directly proportional to its mass, estimate the radius of this hypermassive back hole. You may need to do a little research to figure out the approximate mass of the galaxy. Show all the steps to your calculation and cite all references you use. 2. What would happen to the Earth (and the rest of the solar system) if the Sun were
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Unformatted text preview: replaced by a black hole with the same mass? Why? 3. In the interest of science you give your roommate a flashing light signal beacon and toss him/her into a supermassive galactic black hole. Describe what you see as you observe the fall from far away, stationary relative to the black hole. Explain your reasoning in each of the following questions. a. What happens to the apparent timing and color of the signal beacon as your roommate approaches the event horizon? b. How fast does your roommate seem to be traveling as he/she approaches the horizon? c. How does the brightness of the image vary with time?...
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