Generally speaking, activity on the surface of the Sun is primarily driven by
A. electromagnetism.
B. gravity.
C. nuclear reactions.
D. thermodynamics.
Answer: A
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Olbers' paradox asks
A. Why isn't the night sky bright as day? B. How can the Universe be younger than some of the stars in it? C. If dark matter is dark, how can we ever see it? D. Which is the simplest cosmological model?
Dr. X believes that the Hubble constant is H0 = 55 km/s/Mpc. Dr. Y believes it is H0 = 80 km/s/Mpc. Which statement below automatically follows?
A) Dr. X believes that the universe is expanding, but Dr. Y does not. B) Dr. X believes that the Andromeda Galaxy (a member of our Local Group) is moving away from us at a slower speed than Dr. Y believes. C) Dr. X believes that the universe is older than Dr. Y believes. D) Dr. X believes that the universe will someday stop expanding, while Dr. Y believes it will expand forever. E) Dr. X believes that the universe has a much higher density than Dr. Y believes.
A parallel-plate capacitor is connected to a battery and becomes fully charged. The capacitor is then disconnected, and the separation between the plates is increased in such a way that no charge leaks off
As the plates are being separated, the energy stored in this capacitor A) increases. B) decreases. C) does not change. D) become zero.
Objects the size of the one that exploded over Chelyabinsk (Russia), causing significant damage and injuries to more than 1,000 people, probably hit Earth at least
A) once a century. B) once a year. C) once every 500,000 years. D) once every 100 million years.