A ___________ generally contains well over 1000 galaxies and is quite dense. They often contain many giant elliptical galaxies
a. local group
b. poor cluster
c. rich cluster
d. tidal tail
e. quasar
c
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The figure below shows a container filled with water to the height shown. When we compare the pressure at A to the pressure at B, we find that
a.
.
b.
A BL Lac object is the same as a
a. Type 1 Seyfert. b. Type 2 Seyfert. c. double-lobed radio galaxy. d. blazar. e. quasar.
Moment of Inertia: A majorette fastens two batons together at their centers to form an X shape. Each baton consists of an extremely light 1.2-m bar with small 0.25-kg balls at each end. What is the moment of inertia of this baton about an axis through the center of the X?
Fill in the blank(s) with the appropriate word(s).
Why is most matter electrically neutral?
a. It contains no charges. b. There are equal amounts of positive and negative charges present. c. The charge on the electrons and protons in the material is too small to notice. d. none of the above