How might Mars's weakened magnetic field have allowed for major changes in its climate?
A) Atmospheric gases were left vulnerable to being stripped into space by solar wind particles.
B) The heat combined with the magnetic field, and disappeared with it.
C) Mars has actually heated up since the magnetic field weakened, since the solar rays no longer have such a dense layer to get through.
D) They are completely unrelated; there is no possible influence.
A
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Beats: Two pure tones are sounded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increased?
A. It increases. B. It decreases. C. It does not change. D. It could either increase or decrease.
Components: When Jeff ran up a hill at 7.0 m/s, the horizontal component of his velocity vector was 5.1 m/s. What was the vertical component of Jeff's velocity?
A. 4.8 m/s B. 4.3 m/s C. 3.8 m/s D. 3.4 m/s
Which of the following describes a major similarity between Titan and Earth?
A) Both have nearly identical atmospheric compositions of nitrogen and oxygen. B) Both have features of erosion due to a liquid, except on Titan it is liquid methane and ethane rather than liquid water. C) Both have many active volcanoes erupting with molten rock, except the rock is higher density on Titan. D) The two worlds have very similar surface temperatures and surface compositions.
Which of the following statements best describes Einstein's contributions and views about quantum theory?
A) He didn't make any significant contributions to the theory, but he did accept quantum theory. B) Despite his important work on relativity, Einstein didn't make any important contributions to quantum theory, and furthermore he never really accepted quantum theory. C) Although his work on the photoelectric effect was an important contribution to quantum theory, Einstein never really accepted quantum theory. D) Although his work on the quantum theory of atoms was an important contribution, Einstein never really accepted quantum theory. E) His work on the photoelectric effect was an important contribution to quantum theory, and he accepted the theory as a correct description of the microscopic world.