Which of the following statements is true about the very early universe (within the first three minutes)?
d.
By the end of the first three minutes, the universe had cooled enough for the nuclear strong force to take effect and nucleons bound together to form deuterons.
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Say that our Moon was Full on May 1, 2007. When was the next First Quarter phaseafter that Full Moon?
a) May 15 b) June 1 c) May 22 d) May 8 e) May 4
A piece of wood is floating in a bathtub. A second piece of wood sits on top of the first piece, and does not touch the water. If the top piece is taken off and placed in the water, what happens to the water level in the tub?
A) It goes up. B) It goes down. C) It does not change. D) It cannot be determined without knowing the volumes of the two pieces of wood.
"MeV/c2" is a unit for:
a. energy. c. mass. b. nuclear force. d. momentum.
Going from oldest to youngest, the three periods of the Mesozoic are
A) Triassic, Jurassic, and Permian. B) Jurassic, Triassic, and Cretaceous. C) Triassic, Jurassic, and Cretaceous. D) Cretaceous, Permian, and Jurassic.