Astronomers believe that the interior of Saturn's satellites is mostly ________.
A. iron
B. rock
C. hydrogen and helium
D. ice
Answer: D
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Which of the following is true of the central bulge in the Milky Way?
A) It is a slightly flattened spheroid. B) It is a part of the disk component of the galaxy. C) It consists of spiral arms. D) It is a highly active region for star formation.
Which of the following has virtually no effect on the structure of a planet?
A) its composition B) its size C) its magnetic field D) its mass
After a supernova explosion, the remains of the stellar core
A) will always be a neutron star. B) be either a neutron star or a black hole. C) will always be a black hole. D) may be either a white dwarf, neutron star, or black hole.
A mandolin is a stringed instrument that consists of 4 pairs of identical strings. Each string in a given pair should be at the same tension as its mate and so should produce the same fundamental frequency. Often such strings may be tuned relative to each other by listening for the beat. As you adjust the tension on one of the strings and you feel the beat frequency, you know that the strings are
closer to being tuned to the same frequency under which of these conditions? 1.The beat frequency gets larger and larger as you adjust the tension. 2.The beat frequency remains constant as you adjust the tension. 3.The beat frequency gets lower and lower as you adjust the tension. 4.It is not possible to tune the strings to the same fundamental frequency by using the beat frequency that exists between them.