The Hubble law is one of the most important relations in modern astronomy because it ____
a. allows astronomers to measure the distance to very distant galaxies using only their spectrum
b. explains the difference in the types of galaxies seen in different directions
c. relates the rotation curve of a galaxy to the amount of dark matter it contains
d. connects the mass of a spiral galaxy's bulge to the size of its central black hole
e. determines the mass of a cluster using the rotation period of the galaxies it contains
a
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What scales would you see distant filaments and voids?
A.) 10^24 m. B.) 10^25 m. C.) 10^26 m. D.) 10^27 m. E.) 10^28 m.
A 2.0-C charge moves with a velocity of (
) m/s and experiences a magnetic force of (
) N. The x component of the magnetic field is equal to zero. Determine the y component of the magnetic field.
A. ?3.0 T B. +3.0 T C. +5.0 T D. ?5.0 T E. +6.0 T
The tail of a comet is longest when the comet is
a. closest to the Sun. b. farthest from the Sun. c. closest to Earth. d. farthest from Earth.
A composite volcano is formed by
A) successive flows of fluid basaltic lava. B) a mixture of rock and lava. C) alternating layers of lava, ash, and mud flow debris. D) the accumulation of ash, cinders, and rock debris.