This graph shows how the average distances between galaxies changes with time in the four models for the universe, and also shows data points measured from white dwarf supernovae. Which of the following statements best describes what the data are telling us?
A) The data indicate that we live in an accelerating universe.
B) The data prove beyond doubt that we live in an accelerating universe that will continue to expand forever.
C) The data strongly suggest that our universe is made 95% of dark matter and only 5% of ordinary matter.
D) The data prove beyond doubt that the universe will never collapse.
A) The data indicate that we live in an accelerating universe.
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The orbits of Population II stars have been compared to:
A) planets around the Sun. B) satellites around planets. C) comets around the Sun. D) binary stars. E) the accretion disk around a black hole.
Which of the following is the smallest dwarf planet?
a. Ceres b. Mercury c. Pluto d. Eris
If a = 60 cm, b = 80 cm, Q = ?6.0 nC, and q = 4.0 nC, what is the magnitude of the electric field at point P?
a.
35 N/C
b.
42 N/C
c.
52 N/C
d.
64 N/C
e.
104 N/C
What does a waxing gibbous moon mean?
a. The changing Moon between full moon and third quarter b. The changing Moon between third quarter and new moon c. The changing Moon between first quarter and full moon d. The changing Moon between new moon and first quarter e. The changing Moon between first and third quarters