The constant ke, which appears in Coulomb's law formula, is equivalent dimensionally to which of the following?
a. N/m/C
b. N/C
c. N/m2/C2
d. N/C2
c
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Spiral galaxy rotation curves are generally fairly flat out to large distances. Suppose that spiral galaxies did not contain dark matter. How would their rotation curves be different?
A) The orbital speeds would fall off sharply with increasing distance from the galactic center. B) The orbital speeds would rise upward with increasing distance from the galactic center, rather than remaining approximately constant. C) The rotation curve would be a straight, upward sloping diagonal line, like the rotation curve of a merry-go-round. D) The rotation curve would look the same with or without the presence of dark matter.
Two coherent sound waves will destructively interfere when the path difference is the wavelength times what?
A) half an even integer B) an integer C) half an odd integer D) an odd integer
What distance method is used to determine the distance to the most distant galaxies when only a redshift is measured?
a. Hubble's law b. supernova observations c. period-luminosity relationship of variable stars d. parallax
What is the origin of Martian meteorites?
A) they are rocks brought to Earth by Martians B) they are rocks brought back to Earth by sample return missions C) they are rocks blasted from the surface of Mars by volcanoes; these rocks then floated around in interplanetary space before falling to Earth D) they are rocks blasted from the surface of Mars by impacts; these rocks then floated around in interplanetary space before falling to Earth