The temperature at the Sun's core is about ________.
A. 1,500,000 K
B. 150,000 K
C. 15,000,000 K
D. 15,000 K
Answer: C
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A. -1110 J B. 1110 J C. -110 J D. 110 J
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Suppose a ball is thrown straight up and there is no air. What is its acceleration just before it reaches its highest point?
A) zero B) slightly less than g C) exactly g D) slightly greater than g
The universe first became transparent to most light, coinciding with the origin of the cosmic background radiation, when the universe cooled enough to allow the formation of
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