The type of radio galaxy that reveals its motion through the intergalactic medium is called a
A) Seyfert. B) head-tail. C) quasar. D) bipolar jet. E) dual lobe.
B
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Planets would crash into the Sun if it weren't for
A) their tangential velocities. B) their vast distances from the Sun. C) the inverse-square law. D) their relatively small masses. E) the fact that they are beyond the main gravitation of the Sun.
Mesons are composed of
A. any odd number of quarks. B. three quarks of matching color. C. three quarks of three different colors. D. a colorless quark-antiquark pair.
A glass rod is rubbed with nylon. The rod is then brought close to the metal knob of an electroscope. A person's finger briefly touches the knob on the far side and is then removed. After the rod is removed the charge on the electroscope will be ________.
Fill in the blank(s) with the appropriate word(s).
The plastic-like substratum on which the lithospheric plates move is called the
a. outer core. b. endosphere. c. isosphere. d. asthenosphere.