The Milky Way and other spiral galaxies ____
a. must have formed recently, because they contain young stars
b. formed spiral arms as the result of major collisions with other galaxies
c. created their disks through the process of galactic cannibalism
d. must be very old because they contain so much gas and dust
e. cannot maintain their disk structure if they suffer a major collision
e
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Simple Harmonic Motion is characterized by
A) constant acceleration. B) acceleration proportional to the acceleration of gravity. C) acceleration proportional to displacement. D) acceleration proportional to velocity. E) acceleration inversely proportional to velocity.
The equation of continuity is a statement of the
A) conservation of linear momentum. B) conservation of mass. C) conservation of energy. D) conservation of kinetic energy. E) conservation of angular momentum.
What are the standard units for luminosity?
A) Watts B) Newtons C) Joules D) kilograms E) Watts per second
Clusters appear to have ________ dark matter than their individual galaxies
Fill in the blank(s) with correct word