In the halo, we do NOT find:
A) tidal streams.
B) globular clusters.
C) small satellite galaxies.
D) spiral arms.
E) old white dwarfs.
D
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One sometimes hears reference to a "20-kiloton" bomb. What does this mean?
A) It means 20,000 tons of nuclear explosive is used in the bomb. B) It means that the number of "fissile" nuclei is equal to the number of trinitrotoluene molecules in 20,000 tons of TNT explosive. C) It means that the total weight of the bomb (not just the uranium) is 20,000 tons. D) It means that the energy released by the bomb is equal to the energy released when 20,000 tons of TNT is exploded. E) This refers to the maximum pressure generated by the bomb when it explodes.
Sunlight takes about 8.4 minutes to travel from the Sun to Earth. When NASA's New Horizons Spacecraft passed Pluto in 2015, it was about 32 AU from Earth. About how long did it take for transmitted images of Pluto to travel from the spacecraft to Earth?
A) one Plutonian year B) 4-1/2 hours C) 2-1/4 days D) 3 weeks E) They arrived almost instantaneously.
A racquetball is dropped from a height of one meter. It bounces off the floor and rises to a height of 0.8 m. The collision with the floor was
A. an elastic collision. B. a perfectly inelastic collision. C. a partially inelastic collision. D. impossible to tell without knowing the mass of the ball.
Radon is
A) the chemically active element in asbestos. B) a type of electromagnetic radiation that is produced by the sun and partially penetrates Earth's atmosphere. C) the main component in the radioactive fallout from nuclear weapons and nuclear power plant accidents. D) a radioactive gas produced by the rocks and soil that can filter into houses. E) the radioactive substance that will probably be used to irradiate and sterilize food.