A comet that has a semi-major axis of 100 AU must have a period of about
A. 20 years.
B. 100 years.
C. 1,000 years.
D. 10 years.
Answer: C
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What is the galactic fountain model?
A) a model in which interstellar water vapor can condense to form liquid water rain drops falling toward the galactic disk B) a model that assumes the Milky Way is a spiral galaxy and looks like a whirlpool from above C) a model in which jets of hot, ionized gas blow out of the galactic center and leave the galaxy forever D) a model in which superbubbles blow hot, ionized gas out of the galactic disk and into the halo, where the gas cools down and falls back into the disk
Molecular Speeds: (a) At what Celsius temperature is the average kinetic energy of a helium gas atom equal to 6.21 × 10-21 J? The Boltzmann constant is 1.38 × 10-23 J/K .(b) What would be the temperature for radon gas?
Fill in the blank(s) with the appropriate word(s).
Vector = 6.0 m and points 30° north of east. Vector = 4.0 m and points 30° south of west. The resultant vector + is given by
A) 2.0 m at an angle 30° north of east. B) 2.0 m at an angle 60° north of east. C) 10.0 m at an angle 60° east of north. D) 10.0 m at an angle 30° north of east. E) 10.0 m at an angle 60° north of east.
A boxcar without a front or a back is moving toward the right. Two flashes of light move through the boxcar, one moving from back to front toward the right, the other moving from front to back toward the left. A passenger in the boxcar records how long it takes each flash of light to pass from one end of the boxcar to the other end. According to the passenger, which took longer?
a. the flash going from back to front b. the flash going from front to back c. They both took the same time. d. It depends on whether the passenger is sitting at the front or the back of the boxcar.