A satellite circles planet Roton every 2.8 h in an orbit having a radius of 1.2 × 107 m. If the radius of Roton is 5.0 × 106 m, what is the magnitude of the free-fall acceleration on the surface of Roton?
A. 31 m/s2
B. 27 m/s2
C. 34 m/s2
D. 40 m/s2
E. 19 m/s2
Answer: B
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During the first moments of the big bang when elements could be created, nuclear fusion reactions made few heavy elements because
a. all heavy nuclei are unstable. b. no stable nuclei exist with masses of 5 or 8 hydrogen masses. c. the helium nucleus is unstable. d. the temperature and density were too low. e. no nuclei heavier than helium could form since there weren't any electrons formed.
Uh-oh, the malicious eight-dimensional alien beings are back. This time, imagine that they suddenly changed nature so that neither the uncertainty principle nor the exclusion principle applied to electrons. What would happen almost immediately to atoms?
A) Electrons would fall into the nuclei of atoms. B) Atoms would annihilate each other, releasing huge amounts of energy. C) Atoms would be immediately ionized. D) Nothing; atoms would be unaffected by this change.
A pot that falls from a ledge and hits the ground 45 m below hits the ground at
A) 30 m/s. B) 60 m/s. C) 120 m/s. D) more than 120 m/s.
Approximately how long does it take light to travel across the diameter of the Milky Way?
A) 27,000 years B) 100,000 years C) 200,000 years D) 1 million years