How long does the sunspot cycle last, on average?
A) between 25 and 35 days
B) about seven years
C) 365.25 days
D) about 11 years
E) about 76 years
D
Physics & Space Science
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The lookback time of the cosmological horizon is
A) the age of the universe. B) the Big Bang . C) 1 billion years. D) 10 billion years.
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If you place a pipe over the end of a wrench when trying to rotate a stubborn bolt, effectively making the wrench handle twice as long, you'll multiply the torque by
A) two. B) four. C) eight.
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How can a white dwarf be hotter than our Sun, yet much less luminous?
What will be an ideal response?
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What is the principle of isostasy, and what evidence supports it?
What will be an ideal response?
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