The greatest inaccuracy in Copernicus's model of the solar system was that the planets
a. traveled in circular orbits with uniform motion.
b. traveled on epicycles whose centers followed orbits around the Sun.
c. traveled in elliptical orbits.
d. were allowed to travel backwards in their orbits.
e. orbited the Sun.
a
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The famed meteorite with carbonate rocks and possible microfossils came from:
A) Venus. B) the Moon. C) Mars. D) Europa. E) Comet Halley.
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The acceleration after starting from rest is 8 m/s2
a. True b. False Indicate whether the statement is true or false
A volcano with a high, steep slope is a
a. composite volcano. b. stratovolcano. c. shield volcano. d. cinder cone.
What nuclear fusion mechanism does an isolated white dwarf use to generate energy?
a. Proton-proton chain b. CNO cycle c. Triple alpha process d. White dwarfs don't generate their own energy.