Chapter 34: Q11CQ (page 1237)
If the smallest meaningful time interval is greater than zero, will the lines in Figure below ever meet?

Short Answer
The lines in the given figure will never meet.
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Chapter 34: Q11CQ (page 1237)
If the smallest meaningful time interval is greater than zero, will the lines in Figure below ever meet?

The lines in the given figure will never meet.
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If the cosmic microwave background radiation (CMBR) is the remnant of the Big Bang’s fireball, we expect to see hot and cold regions in it. What are two causes of these wrinkles in the CMBR? Are the observed temperature variations greater or less than originally expected?
Consider a supermassive black hole near the center of a galaxy. Calculate the radius of such an object based on its mass. You must consider how much mass is reasonable for these large objects, and which is now nearly directly observed. (Information on black holes posted on the Web by NASA and other agencies is reliable, for example.)
(a) What is the approximate speed relative to us of a galaxy near the edge of the known universe, some\({\rm{10 Gly}}\)away? (b) What fraction of the speed of light is this? Note that we have observed galaxies moving away from us at greater than\({\rm{0}}{\rm{.9c}}\).
Our solar system orbits the center of the Milky Way galaxy. Assuming a circular orbit\({\rm{30,000 ly}}\)in radius and an orbital speed of\({\rm{250 km/s}}\),how many years does it take for one revolution? Note that this is approximate, assuming constant speed and circular orbit, but it is representative of the time for our system and local stars to make one revolution around the galaxy.
Distances to local galaxies are determined by measuring the brightness of stars, called Cepheid variables, that can be observed individually and that have absolute brightness at a standard distance that are well known. Explain how the measured brightness would vary with distance as compared with the absolute brightness.
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