All ____ galaxies are spiral galaxies that have small luminous nuclei
a. active
b. radio
c. Seyfert
d. double-lobed radio
e. blazar
C
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Plane Mirrors: A lighted candle is placed a short distance from a plane mirror, as shown in the figure. At which location will the image of the flame appear to be located?
A. at A B. at B C. at C D. at M (at the mirror)
The center of mass of a human body is located at a point that
A) is fixed, but different for different people. B) is always directly behind the belly button. C) changes as a person bends over. D) none of the above
Suppose a small M type star (mass less than 0.1 solar masses) is orbiting an invisible object in space. The radius of the orbit is 2.0 A.U., the period is 2.0 years. How massive is the invisible object? Could it be a burned out white dwarf star?
What will be an ideal response?
Point bars typically form
A) on the inside bend of a curved stream channel. B) on the outside bend of a curved stream channel. C) in the middle of a straight stream channel. D) in the middle of a curved stream channel.