Reactions that take place in a breeder reactor change
A) elements into different elements.
B) molecules into different molecules.
C) ions into different ions.
D) all of the above
E) none of the above
Answer: A
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The two most abundant elements in the Sun are:
A) magnesium and carbon. B) hydrogen and helium. C) nitrogen and neon. D) iron and oxygen.
Titan is roughly the same size as Mercury, yet Titan has an atmosphere while Mercury does not. How can this be?
A) Although Titan is roughly the same size as Mercury, it is much denser, making its gravitational field stronger B) Unlike Mercury, Titan is constantly being bombarded by icy comets that evaporate and maintain its atmosphere C) On its surface, Titan has volcanism that is constantly replenishing its atmosphere while Mercury does not D) Even though Titan's gravity is weak, it is much colder, allowing molecules to be trapped in its atmosphere
Which one of the following is TRUE?
A. Irregular galaxies rarely have star formation taking place in them. B. Most galaxies appear to be approaching the Milky Way Galaxy. C. Most elliptical galaxies contain only young stars. D. Smaller galaxies called dwarf galaxies tend to be found around larger galaxies like the Milky Way. E. Galaxy collisions destroy most of the stars in the galaxies involved.
Two objects, one of mass m and the other of mass 2 m, are dropped from the top of a building. If there is no air resistance, when they hit the ground
A. the heavier one will have twice the kinetic energy of the lighter one. B. both will have the same kinetic energy. C. the heavier one will have half the kinetic energy of the lighter one. D. the heavier one will have four times the kinetic energy of the lighter one. E. the heavier one will have one-fourth the kinetic energy of the lighter one.