What does it mean for a physical quantity in a system to be conserved?
a. It is used in the most efficient manner possible.
b. It stays in its original state forever.
c. The total amount of it in the system stays constant.
d. none of the above.
C
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Astronomers estimate the total number of comets in the solar system to be about
A) 100 million. B) 1 billion. C) 10 billion. D) 100 billion. E) 1 trillion.
In an annular eclipse,
A) the Sun appears as a thin, bright ring. B) the Moon appears as a thin, bright ring. C) the Moon is totally blocked by the Earth. D) the Sun is partially blocked by the Earth. E) the Sun is totally blocked by the Moon.
Wood does not have magnetic properties because it contains no
A) iron or other metals. B) magnetic domains. C) moving electrons. D) none of the above
Which of the following can be considered a near Earth object?
A) An asteroid orbiting at a distance of 0.1 AU from the Sun B) An asteroid orbiting at a distance of 0.5 AU from the Sun C) An asteroid orbiting at a distance of 1.01 AU from the Sun D) An asteroid orbiting at a distance of 2.01 AU from the Sun