A laser beam takes 24 ms to be reflected from the surface of a planet. How far from the laser source is this planet's surface?
A) 24 × 105 m
B) 12 × 105 m
C) 18 × 105 m
D) 36 × 105 m
E) 48 × 105 m
D
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A fixed amount of an ideal monatomic gas is maintained at constant volume as it is cooled by 50 K. This feat is accomplished by removing 400 J of energy from the gas. How much work is done on the gas during this process?
A) 0 J B) 400 J C) -400 J D) -200 J E) 200 J
The water in a river flows downstream at 3.0 M/s. A boat is motoring upstream against the flow at 5.0 m/s. What is the boats speed of relativity to the riverbank/
A. 8.0 M/s B. 5.0 M/s C. 3.0 M/s D. 2.0 m/s
What are the two key observational facts that led to widespread acceptance of the Big Bang model?
A) the cosmic background radiation and the high helium content of the universe B) the cosmic background radiation and the expansion of the universe C) the cosmic background radiation and the near-critical density of the universe D) the predominance of matter over antimatter and the near-critical density of the universe E) the predominance of matter over antimatter and the large scale structure of galaxies
What type of galaxies do astronomers believe to be the most common?
a. Elliptical b. Spiral c. Irregular d. Astronomers have no idea which type of galaxy is more common.