COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 28, Problem 20QAP
To determine
The distance to galaxy from us that is moving at one tenth
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Given hubble expansion and the accelerating expansion of the universe, what equation would be used to determine the maximum go-return distance (the maximum comoving distance from a point of origin an entity can go from their point of origin and still be able to return in a finite period of time) given an object's velocity as a fraction of the speed of light (and the time it would take to get to any given comoving distance at some fraction of c)what would that distance be for the speeds of 0.8c 0.9c & 0.95c? please provide the valuesThe accelerating expansion of the universe also implies that the overall density of matter in the universe will decrease over time. what equation tells you how dense the volume of our go-return bubble would at a given future time compared to present date?
Chapter 28 Solutions
COLLEGE PHYSICS
Ch. 28 - Prob. 1QAPCh. 28 - Prob. 2QAPCh. 28 - Prob. 3QAPCh. 28 - Prob. 4QAPCh. 28 - Prob. 5QAPCh. 28 - Prob. 6QAPCh. 28 - Prob. 7QAPCh. 28 - Prob. 8QAPCh. 28 - Prob. 9QAPCh. 28 - Prob. 10QAP
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- Show that the velocity of a star orbiting its galaxy in a circular orbit is inversely proportional to the square root of its orbital radius, assuming the mass of the stars inside its orbit acts like a single mass at the center of the galaxy. You may use an equation from a previous chapter to support your conclusion, but you must justify its use and define all terms used.arrow_forward. A compact neutron star has a mass of kg (about 1.4 times the mass of the Sun) but a radius of only m (approximately 6.2 mi!). If a clock on the surface of this exotic star marks the passage of 1 h of time, how much time is observed to pass on an identical clock located a very large distance from the neutron star?arrow_forwardHow fast would a muon have to be traveling relative to an observer for its lifetime as measured by this observer to be 10 times longer than its lifetime when at rest relative to the observer?arrow_forward
- The mass of the fuel in a nuclear reactor decreases by an observable amount as it puts out energy. Is the same true for the coal and oxygen combined in a conventional power plant? If so, is this observable in practice for the coal and oxygen? Explain.arrow_forwardTwo astronomical events are observed to occur at a time of 0.30 s apart and a distance separation of 2.0109m from each other. How fast must a spacecraft travel from the site of one event toward the other to make the events occur at the same time when measured in the frame of reference of the spacecraft?arrow_forward(a) What is the approximate speed relative to us of a galaxy near the edge of the known universe, some 10 Gly away? (b) What traction of the speed of light is this? Note that we have observed galaxies moving away from us at greater than 0.9c.arrow_forward
- On average, how far away are galaxies that are moving away from us at 2.0% of the speed of light?arrow_forwardGiven hubble expansion and the accelerating expansion of the universe, what equation would be used to determine the maximum go-return distance (the maximum comoving distance from a point of origin an entity can go from their point of origin and still be able to return in a finite period of time) given an object's velocity as a fraction of the speed of light (and the time it would take to get to any given comoving distance at some fraction of c)what would that distance be for the speeds of 0.8c 0.9c & 0.95c?The accelerating expansion of the universe also implies that the overall density of matter in the universe will decrease over time. what equation tells you how dense the volume of our go-return bubble would at a given future time compared to present date?arrow_forwardThe center of our Milky Way galaxy is about 23 000 ly away. (a) To eight significant figures, at what constant speed parameter would you need to travel exactly 23 000 ly (measured in the Galaxy frame) in exactly 30 y (measured in your frame)? (b) Measured in your frame and in lightyears, what length of the Galaxy would pass by you during the trip?arrow_forward
- If a GUT is proven, and the four forces are unified, it will still be correct to say that the orbit of the moon is determined by the gravitational force. Explain why.arrow_forwardThe radius of our galaxy is approximately3 x 10^20 m. How fast must a spaceship travel so that thecrossing the galaxy takes 40 years as measured on boardthe Ship? How long would the trip take as measured onEarth?arrow_forwardI'm not sure how to solve this equation! Also, how can I solve for the f value alone? Thanks!arrow_forward
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