Consider a plot of the displacement (x) vs. applied force (F) for an ideal elastic spring. The slope of the curve would be
A) the spring constant.
B) the reciprocal of the spring constant.
C) the acceleration of gravity.
D) the reciprocal of the acceleration of gravity.
E) the reciprocal of the displacement.
B
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Suppose that inflation did not occur. In that case, the fact that the cosmic microwave background has the same temperature in opposite directions of the sky would be considered
A) surprising, because those locations would never have been close enough to have any light or matter exchanged between them. B) surprising, because we would not expect those locations to have the same age. C) natural, because everything in the universe is naturally expected to have the same temperature. D) natural, because quantum fluctuations in the early universe would have ensured that the whole universe had precisely the same temperature.
Why is the era of nucleosynthesis so important in determining the chemical composition of the universe?
A) All the elements except hydrogen were produced after the era of nucleosynthesis. B) We can observe spectra from this era to determine what the primordial mix of the elements was at the beginning of the universe. C) Except for the small amount of matter produced later by stars, the chemical composition of the universe is the same now as at the end of the era of nucleosynthesis. D) We can study the processes that occurred during the era of nucleosynthesis to determine how most of the elements in the universe were created. E) By knowing how much matter was created during the era of nucleosynthesis, we can determine whether the universe is open or closed.
A wave travels an average distance of 6 m in 1 s. What is the wave's average velocity?
A) less than 0.2 m/s B) 1 m/s C) 3 m/s D) 6 m/s E) more than 6 m/s
You see colors in a rainbow because of __________
Fill in the blank(s) with correct word