What is 56 + (32.00)/(1.2465 + 3.45 ) written with the correct number of significant figures?
A) 62.8
B) 62.8123846
C) 62.812
D) 63
E) 62.81
D
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Why did the era of nucleosynthesis end?
A) Too many heavy elements were produced. B) Neutrinos carried off too much energy. C) The temperature of the universe became too low. D) The density of the universe became too low.
Standing Sound Waves: In a resonating pipe that is open at both ends, there
A. are displacement nodes at each end. B. are displacement antinodes at each end. C. is a displacement node at one end and a displacement antinode at the other end. D. None of these choices are correct.
A force acting upon an object to cause a displacement is known as _________________.
A) Energy B) Potential C) Kinetic D) Work
Which of the following has been the most important for maintaining the Earth's stable climate over the time it took for large organisms to evolve?
A) impacts of water-bearing planetesimals B) the ending of the heavy bombardment C) plate tectonics D) the tides E) deep sea volcanic vents