Active galaxies are having their central engines temporarily fed by what occurrence?
A) a sudden surge in star formation in the nucleus
B) a series of supernovae all occurring in the dense nuclear bulge
C) a close interaction with a neighboring galaxy
D) attack by a swarm of globular clusters
E) the merger of a binary black hole system
C
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If the momentum of an electron is 1.53 MeV/c, what is its kinetic energy?
A. 1.53 MeV B. 1.02 MeV C. 1.44 MeV D. 1.10 MeV E. 2.59 MeV
The annealing point for the soda-lime glass in Figure 9.3 is approximately _________K
Fill in the blank(s) with the appropriate word(s).
The uncompressed density of a planet in our solar system
a. is greatest for the Jovian planets. b. is greatest for the planets closest to the sun. c. is greatest for the planets furthest from the sun. d. is greatest for the planets with the largest mass. e. is greatest of the planet with the largest radius.
The removal of the carbon dioxide from the atmosphere is critical to Earth because:
A) an atmosphere rich in carbon dioxide can trap heat. B) carbon dioxide is transparent to infrared radiation. C) carbon dioxide is opaque to ultraviolet radiation. D) carbon dioxide reduces plants' ability to synthesize energy.