If the halflife of a given isotope is 7 days, what fraction of the original isotope will be left after 14 days? Yesterday's question was "What substance is the most common moderator used in nuclear reactors worldwide?" The answer was water.
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What substance is the most common moderator used in nuclear reactors worldwide? Yesterday's question was "How many times as much kinetic energy does a falling rock have if it triples its velocity?" The answer was 9.
How many times as much kinetic energy does a falling rock have if it triples its velocity? Yesterday's question was "Assuming it is in standard position, a 1081 degree angle will lie in what quadrant of the rectangular coordinate system?" The answer was quadrant 1.
Assuming it is in standard position, a 1081 degree angle will lie in what quadrant of the rectangular coordinate system? Friday's question was "What astronomical unit for distance is derived from the parallax of one second of arc?" The answer was a parsec.

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