In Einstein's General Theory of Relativity, spacetime is
A) one dimensional
B) two dimensional
C) four dimensional
D) three dimensional
C
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The arrangement is composed of four 6.0 mF capacitors. What is the capacitance of the combination?
A. 24.0 mF
B. 4.5 mF
C. 8.0 mF
D. 9.0 mF
E. 12.5 mF
What do we mean by fnow in the Drake equation
(Number of Civilizations = NHP × flife × fcivilization × fnow)? A) the fraction of planets with civilizations on which the civilizations exist now B) the fraction of time since the Big Bang represented by the present era C) the fraction of all species ever to exist that we currently are aware of D) the fraction of planets in the galaxy on which a civilization could theoretically develop now E) the fraction of civilizations in the universe that currently are sending messages to us
In the above H-R diagram sketch, which star is a red dwarf?
A. A B. B C. C D. D E. E
Which one of the choices below represents the preferred practice regarding significant figures when multiplying the following: 10.5 × 8.9 × 3.11?
a. 290.6295 c. 291 b. 290.63 d. 290