Compared with an alcohol barometer, the column height for a mercury barometer would be
A) lower.
B) higher.
C) the same.
Answer: A
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How did Harlow Shapley use the period-luminosity relationship of RR Lyrae variables to determine the size of the Milky Way galaxy?
a. He determined the proper motion of globular clusters in the outer disk of the galaxy. b. He found the distances to individual variables free floating in the halo. c. He found the distances to open clusters found throughout the disk of the galaxy. d. He found the distances to globular clusters distributed about the center of the galaxy.
Briefly summarize the differences between terrestrial and jovian planets
What will be an ideal response?
The Jovian planets have low density because:
A) they formed in the outer solar nebula where water vapor could freeze to form ice particles. B) interactions between their magnetic fields and the solar wind generate powerful electric currents. C) the continuous blast of micrometeorites evaporates surface ice, leaving behind embedded minerals. D) the heat flowing out of them emits about twice as much less energy as they absorb from the Sun.
A friend argues that if mass were really conserved he would never need to refill his gas tank. What explanation do you offer your friend?
A) The atoms (mass) of gasoline are converted into energy by the engine according to E=mImage. B) The Law of Conservation of Mass does not apply to reactions involving combustion or explosion of matter. C) The atoms (mass) of gasoline are converted into exhaust fumes. D) The oil companies make gasoline in a way that it gets used up so that we are always required to replenish it.