Which of the three key environmental requirements for life might Europa possess?
A) a source of elements and molecules from which to build living organisms
B) a source of energy for metabolism and growth
C) a liquid medium for transporting the molecules of life
D) all of these
D
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The spacecraft called Curiosity is
A) a rover on Mars. B) an orbiter studying Jupiter. C) a robotic lander on Venus. D) currently orbiting Saturn.
A thin lens of focal length -12.5 cm has a 5.0 cm tall object placed 10 cm in front of it. What are the size and orientation of the image?
A. 4.0 cm, inverted B. 4.0 cm, upright C. 2.8 cm, inverted D. 2.8 cm, upright E. 100 cm, inverted
Einstein's theory of relativity tells us that travelers who make a high-speed trip to a distant star and back will
A) age less than people who stay behind on Earth. B) age more than people who stay behind on Earth. C) have more fun than people who stay behind on Earth. D) never be able to make the trip within their lifetimes.
Earth is a noninertial reference system:
a. only because it rotates. b. only because it revolves. c. only because of the movement of the Milky Way Galaxy. d. only because of the motion of the Moon. e. because of all the various ways it moves, including rotation, revolution, and the movement of the Galaxy.