The largest plutons are called ______________
a. dikes
b. sills
c. batholiths
d. laccoliths
c
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Identical point charges (+50 ?C) are placed at the corners of a square with sides of 2.0-m length. How much external energy is required to bring a fifth identical charge from infinity to the geometric center of the square?
A. 41 J B. 16 J C. 64 J D. 10 J E. 80 J
To operate properly, superconductors must be kept below a critical temperature. The highest critical temperature for currently available superconductors is about
A. 10 K. B. 300 K. C. 200 K. D. 100 K. E. 25 K.
Statistical evidence
a. can be used to draw conclusions about a specific cases. b. is applicable to classes of objects where only a few objects from the class have been studied. c. allows scientists to determine the mechanism that produces the dust ring in Centaurus A. d. allows scientists to deduce general characteristics about a class of objects with similar properties. e. provides insight into the behavior of an individual object based on careful observations of it.
Which one of the following is TRUE?
A) Most elliptical galaxies contain only young stars. B) Barred spiral galaxies have similar properties to normal spirals, except for the "bar" feature. C) Galaxy collisions destroy most of the stars in the galaxies involved. D) Irregular galaxies rarely have star formation taking place in them. E) Most galaxies appear to be approaching the Milky Way Galaxy.