Detailed measurements of the disk and central bulge region of our Galaxy suggest our Milky Way is a:
A) normal spiral galaxy.
B) barred spiral galaxy.
C) very flat elliptical galaxy.
D) very dusty irregular galaxy.
E) quasar.
B
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What is the Sun mainly made of?
A) hydrogen and oxygen B) hydrogen and helium C) carbon and nitrogen D) oxygen and carbon E) nearly equal portions of all the elements
A small uniform disk and a small uniform sphere are released simultaneously at the top of a high inclined plane, and they roll down without slipping. Which one will reach the bottom first?
A) the one of smallest diameter B) the one of greatest mass C) the disk D) the sphere E) They will reach the bottom at the same time.
Climate models predict that due to the melting of the polar ice caps, sea levels by the end of this century
A) will remain stable due to increased evaporation into the Earth's atmosphere B) may rise by several tens of meters C) will actually fall by several inches due to increased evaporation into the Earth's atmosphere D) may rise by several meters
Water is good for putting out fires because it has a very high latent heat of vaporization
a. True b. False Indicate whether the statement is true or false