When ice crystals form in the clouds, ________
a. heat energy is released
b. the atmosphere becomes colder
c. phase change from solid to liquid occurs
d. the thermal mass of the atmosphere increases
a
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In our part of the universe, antimatter is
A) non-existent. B) plentiful. C) short-lived. D) long-lived.
One way that future space stations may create artificial gravity is by rotating the station. Consider a cylindrical space station 380 m in diameter that is rotating about its longitudinal axis
Astronauts walk on the inside surface of the space station. How long will it take for each rotation of the cylinder if it is to provide "normal" gravity for the astronauts? A) 6.2 s B) 28 s C) 4.4 s D) 39 s
Astronomers build telescopes on tops of mountains because
a. there is less air to dim the light. b. the seeing is better. c. CCDs work better when there is less oxygen in the air. d. all of the above e. a and b
The radius of a super-Earth generally falls in the range:
A) above 5 Earth radii.
B) between 2 and 5 Earth radii.
C) between 1.25 and 2 Earth radii.
D) between 0.75 and 1.25 Earth radii.
E) below 0.75 Earth radii.