Suppose the following graph shows the potential energy function for a certain hypothetical interaction. 
This interaction is
A. attractive for all r.
B. repulsive for all r.
C. attractive for small r, but repulsive for large r.
D. repulsive for small r, but attractive for large r.
E. impossible to characterize without more information.
A. attractive for all r.
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For all adiabatic processes:
A. the entropy of the system does not change B. the entropy of the system increases C. the entropy of the system decreases D. the entropy of the system does not increase E. the entropy of the system does not decrease
The first Jovian moons were discovered by
A) Galileo B) Tycho C) Huygens D) Cassini
Consider a spacecraft that travels round-trip to the zeta reticuli star system (distance 39.5 light-years) at 99% of the speed of light
If the round-trip travel time as measured from Earth is 79.8 years, how much time would pass for passengers on the spacecraft? A) 39.9 years B) 79.8 years C) 22.6 years D) 11.3 years
As the 21st century began, which of the following is a discovery made by astronomers?
A) The Universe has a center. B) The expansion of the Universe is actually accelerating. C) The Universe has an edge. D) The expansion of the Universe has come to a halt.