How do observations of distant galaxies help us learn about galaxy evolution?
A) Observations at different distances show galaxies of different ages and therefore different stages of evolution.
B) We can observe the birth of galaxies.
C) We can observe the evolution of a single galaxy over time.
D) We can observe two galaxies merging and what the result is, helping us learn how mergers affect evolution.
E) We can see what our galaxy used to look like and therefore theorize about the physical processes that led to its current appearance.
A
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Geologists view the part of our planet that is called the ______________ as consisting of a number of close-fitting plates
a. mesosphere b. lithosphere c. asthenosphere d. none of these
As the distance between two objects increases, how does the force of gravity between them decrease
When air drag affects the motion of projectiles, they don't travel
A) as high. B) as far. C) both of these D) neither of these
The demonstration in this figure is often shown as a magician's trick. What in fact is the "trick?"
a. When the magician yanks the tablecloth rapidly, the inertia of the dishes prevents them from accelerating significantly during the short time the force of friction from the moving tablecloth acts. b. The magician uses magnets or some other external device to keep the dishware in place. c. The tablecloth has almost zero mass, or inertia. Hence, it is easy to pull away from the dishware. d. The mass of the tablecloth prevents it from accelerating rapidly enough to exert much force on the dishes. e. The dishes have much less inertia than the tablecloth.