What would happen if a small piece (say the size of a paper clip) of neutron star material suddenly appeared on Earth?
What will be an ideal response?
The extremely dense material could not be supported by the ordinary material on Earth, and it would plunge to the center of Earth under the action of gravity. Its momentum would carry it past the center, back to the other side, and it would continue to oscillate back and forth through Earth creating a small hole each time (that would rapidly fill with molten rock) until friction finally brought it to rest at the center of Earth.
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Which of the following are active galaxies?
A. quasars B. radio galaxies C. Seyfert galaxies D. All of these choices are correct.
Suppose that a white dwarf is gaining mass through accretion in a binary system. What happens if the mass someday reaches the 1.4 solar mass limit?
A) The white dwarf will collapse in size, becoming a neutron star. B) The white dwarf will undergo a nova explosion. C) The white dwarf will explode completely as a white dwarf supernova. D) The white dwarf will collapse to become a black hole.
The four general categories of "energy resources" from which we can obtain useful energy services are: fossil, nuclear, renewable [i.e., alternative], and
A) hydroelectric. B) breeder reactors. C) biomass. D) chemical. E) energy efficiency.
When considering the law of conservation of lepton number for a reaction, how many different lepton numbers must be checked?
a. 1 b. 2 c. 3 d. 6