What is the period of revolution of a planet in circular orbit around a star of 4.0 solar masses if it is at a distance from the star equal to that of the Earth from the Sun?
0.50 year
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Most active galactic nuclei are powered by
A) supermassive black holes. B) a large number of supernovae. C) mergers of compact objects. D) black hole mergers. E) extra-terrestrial civilizations.
The distinction between impulse and force involves the
A) distance the force acts. B) time the force acts. C) difference between acceleration and velocity. D) mass and its effect on resisting a change in momentum.
Which of the following is the nation's leading spokesperson on matters of public health?
What will be an ideal response?
Now consider Object 2. What can you say about Object 2 in comparison to Object 1?
A) Object 2 is moving away from us faster than Object 1. B) Object 2 contains more hydrogen than Object 1. C) Object 1 had a higher temperature than Object 2. D) Object 2 is moving toward us while Object 1 is moving away from us.