According to the Hubble law, where H = 17 km/s/106 lightyears, what is the velocity of recession of a quasar at a distance of 2 billion lightyears from Earth?
a. 0.75 c
b. 0.33 c
c. 0.55 c
d. 0.11 c
e. 0.93 c
d
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Astronomers try to reconstruct our Galaxy's past from _____
A) its spherical component B) its disk component C) its spiral arms D) the stars of neighboring galaxies
A glider on an air track is connected by a spring to the end of the air track. If it takes 0.30 s for the glider to travel the distance of 12 cm from one turning point to the other, its amplitude is
A. 12 cm B. 6 cm C. 24 cm D. 36 cm E. 3.6 cm F. We are not given enough information to answer.
The large canyon of Mars, Valles Marineris, is a ________ produced when the entire Tharsis region bulged outward causing the surface to split
Fill in the blank(s) with correct word
Iridescent colors in the pearly luster of an abalone shell are due to
A) refraction. B) diffraction. C) dispersion. D) polarization. E) interference.