How do we know the Sun is in hydrostatic equilibrium?
A. It is not growing colder.
B. It is not exploding.
C. It is not collapsing.
D. All of these choices are correct.
E. None of these choices are correct.
Answer: D
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Why would it not be a good idea to send a lander to one of the jovian planets?
A) The jovian planets have no solid surface to land on. B) The jovian planets are too far away. C) It would be impossible to slow the lander down sufficiently to avoid a catastrophic crash. D) There's too much risk of hitting a boulder in the planet's rings on the way down. E) There is nothing interesting to find on the jovian planets.
The search for radio signals from intelligent civilizations on planets around nearby solar-type stars is an example of a
A) sky survey B) targeted search C) intentional search D) random sweep
Where would you expect to isolate molecules in a fractionating tower that have a large number of interatomic forces?
A) near the bottom B) near the top C) near the middle D) Fractional distillation takes advantage of molecular weight. E) Fractional distillation takes advantage of the number of isomers.
According to Kepler, the orbital period of a planet is directly proportional to the
A) planet's average distance from the Sun. B) square of the planet's average distance from the Sun. C) cube of the planet's average distance from the Sun.