Using an orbit size of 8 kpc, and a period of 225 million years, the mass of our Galaxy is found to be closest to:
A) 106 solar masses.
B) 108 solar masses.
C) 1010 solar masses.
D) 1011 solar masses.
E) 1012 solar masses.
D
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All of the following are true. Which of these gives evidence that quasars were more common when the universe was young than they are today?
A) They are more common at very great distances. B) They are very bright. C) They are active galactic nuclei. D) We don't see them in every galaxy.
Any location can be chosen for potential energy equal to zero
Indicate whether the statement is true or false
What is the basic explanation for the origin of electromagnetic waves?
Suppose current is flowing in a wire from right to left. Which way do the electrons in the wire move?
a. right to left b. left to right c. in circles d. It is impossible to tell.