The reason that the atmosphere of Venus is over 95% carbon dioxide is thought to be because:
A) Venus was much hotter than Earth when its atmosphere formed.
B) the early plant life on Venus produced the excess carbon dioxide and consumed the oxygen.
C) life on Earth formed earlier than on Venus.
D) the part of the solar nebula where Venus formed contained more carbon dioxide than the part where Earth formed.
E) Venus' Greenhouse Effect got out of control and became runaway after its oceans of sulfuric acid evaporated.
A
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An iron block in a furnace is heated and consequently expands, which means that its density is
A) less. B) the same. C) more.
The lowest tone to resonate in pipe of length L that is open at both ends is 200 Hz. Which one of the following frequencies will not resonate in the same pipe?
A) 200 Hz B) 400 Hz C) 600 Hz D) 800 Hz E) 900 Hz
The assumption of homogeneity states that
a. the universe looks the same at all epochs. b. the universe looks the same from all locations over sufficiently great distances. c. the universe looks the same in all directions over sufficiently great distances. d. all of the above e. none of the above
Helioseismology shows that deeper layers of gas in the sun rotate at different speeds. When different parts of an object rotate at different rates it is called
a. the dynamo effect. b. lagging. c. reconnection. d. differential rotation. e. the Zeeman effect.