Together the Cassini spacecraft and its probe Huygens discovered which of the following features on Titan?
A. dunes of ice crystals
B. lakes near the polar regions
C. an ice volcano
D. river networks
E. All of these choices are correct.
Answer: E
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A boxcar without a front or a back is moving toward the right. Two electrons move through the boxcar, one moving from back to front toward the right, the other moving from front to back toward the left. According to me, each electron is moving with a speed of 0.8c, and the boxcar is moving with a speed of 0.6c. A passenger in the boxcar records how long it takes each electron to pass from one end
of the boxcar to the other end. According to the passenger, which took longer? a. the electron going from back to front b. the electron going from front to back c. They both took the same time. d. Since nothing can go faster than light, an electron cannot move toward the left with a speed of 0.8c through a boxcar moving toward the right with a speed of 0.6c.
Suppose the pressure of 20 g of an ideal monatomic gas is tripled while its volume is halved. What happens to the internal energy of the gas?
a. It stays the same, as the described changes do not involve internal energy. b. It increases. c. It decreases. d. This depends on the molecular weight of the gas involved, thus this is indeterminate.
Small deviations in a planet's orbital motion
A) indicate the presence of an extensive atmosphere. B) imply the nearby presence of a massive body. C) indicate the presence of a powerful magnetic field. D) show the planet's orbit isn't stable. E) show we don't fully understand gravitational forces yet.
What do we mean by the main-sequence turnoff point of a star cluster, and what does it tell us?
A) It is the spectral type of the hottest main-sequence star in a star cluster, and it tells us the cluster's age. B) It is the mass of the most massive star in the star cluster, and it tells us the cluster's size. C) It is the point in a star cluster beyond which main sequence stars are not found, and it tells us the cluster's distance. D) It is the luminosity class of the largest star in a star cluster, and it tells us the cluster's age.