The average density of neutron stars approaches:
A) a million times that of normal matter.
B) a million times that of even a white dwarf.
C) about 1017 kg/m3, similar to the density of atomic nuclei.
D) about 1018 times that of water.
E) infinity.
C
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Which of the following is not one of the major types of metamorphism?
a. Contact b. Fold c. Shear d. Regional
Newton's Second Law in 1 Dimension: The figure shows an object's acceleration-versus-force graph. What is the mass of this object?
A. 2.5 g B. 1.6 g C. 630 g D. 400,000 g
Why do we conclude that a starburst must represent only a temporary stage in galaxy evolution?
A) We observe starbursts to last only a few years in any individual galaxy before the starburst ends. B) The star formation rate of a starburst would consume all available gas for star formation in a time much shorter than the age of the universe. C) We don't see any starbursts occurring in nearby galaxies. D) Galaxies with starbursts are all very far away, indicating that these starbursts occurred only very long ago.
Suppose you are aboard a rocket that is orbiting Earth in the low, circular orbit shown. If you want to escape from Earth and head to the Moon or Mars along the "escape" path shown, what do you need to do?
A) Fire the rocket engine in your direction of travel, so that you gain speed. B) The only way to end up on the "escape" path is to first return to Earth, then launch your rocket with escape velocity. C) Turn the rocket around, and fire the engine so that you lose speed. D) Throw some excess supplies overboard, so that your rocket becomes less massive.