Earth is farthest from the Sun in July and closest to the Sun in January. During which Northern Hemisphere season is Earth moving fastest in its orbit?
A) winter
B) spring
C) summer
D) fall
A) winter
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Which of the following telescopes must be used above Earth's atmosphere?
a. an optical telescope b. the VLBA telescope c. an X-ray telescope d. a radio telescope e. None of the other choices are correct.
Simple Pendulum: A pendulum of length L is suspended from the ceiling of an elevator. When the elevator is at rest the period of the pendulum is T. How does the period of the pendulum change when the elevator moves upward with constant velocity?
A. The period does not change. B. The period increases. C. The period decreases. D. The period becomes zero. E. The period increases if the upward acceleration is more than g/2 but decreases if the upward acceleration is less than g/2.
The Andromeda Galaxy is faintly visible to the naked eye in the constellation Andromeda. Suppose instead it were located in the same direction in space as the center of the Milky Way Galaxy (but still at its current distance)
How would it appear to the eye in that case? A) We could not see it at all. B) It would look about the same, but would be in the constellation Sagittarius instead of Andromeda. C) It would be much brighter, because it would be illuminated by the many stars in the center of our galaxy. D) It would look about the same, but it would be harder to pick out because its cloud-like appearance would make it blend in with the cloud-like appearance of the Milky Way in our sky.
Oxygen is supplied to the atmosphere by
a. ozone. b. incomplete combustion. c. photosynthesis. d. complete combustion.