The luminous matter in the universe accounts for what percent of the total mass of the universe?
A) About 5%
B) About 23%
C) About 27%
D) About 73%
E) 100%
A
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How do observations of distant galaxies help us learn about galaxy evolution?
A) Observations at different distances show galaxies of different ages and therefore different stages of evolution. B) We can observe the birth of galaxies. C) We can observe the evolution of a single galaxy over time. D) We can observe two galaxies merging and what the result is, helping us learn how mergers affect evolution. E) We can see what our galaxy used to look like and therefore theorize about the physical processes that led to its current appearance.
Of all the planets, the axial tilt and rotation period of ________ is most like our own
A) Earth B) our Moon C) Venus D) Mars E) Mercury
A beam of polarized light of intensity I0 passes through a sheet of ideal polarizing material. The polarization axis of the beam and the transmission axis of the sheet differ by 38°. What is the intensity of the emerging light?
a. 0.79I0 b. 0.62I0 c. 0.91I0 d. 0.90I0 e. 0.96I0
A wire carries a steady current of 0.30 A over a period of 20 s. What total charge passes through the wire in this time interval?
a. 67 C b. 20 C c. 6.0 C d. 0.015 C e. 0.30 C