If the earth were twice as far from the sun as it presently is, how long (in terms of the present year) would it take it to make one orbit around the sun?
A) 2.0 years
B) 2.8 years
C) 4.0 years
D) 5.7 years
E) 16 years
B
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Which of the following causes seasons on Earth?
a. Earth being closer to the Sun during our summer and farther during our winter b. the Sun's varying light output c. the tilt of Earth's axis d. the eleven-year sunspot cycle
Two 5000-kg rail cars roll without friction (one at 1 m/s, the other at 2 m/s) toward each other on a level track. They collide, couple, and roll together with a combined momentum of
A) zero. B) 5000 kg m/s. C) 10,000 kg m/s. D) 15,000 kg m/s.
A ball with original momentum +2.0 kgm/s hits a wall and bounces straight back without losing any kinetic energy. The change in momentum of the ball is:
a. 0. c. 4.0 kgm/s. b. -4.0 kgm/s. d. -8.0 kgm/s.
The factor fnow, in the Drake equation depends on
A) whether a civilization ever develops intelligence B) whether a planet has any kind of life on its surface right now C) how technologically advanced civilizations become D) how long civilizations survive once they have arisen