LR Circuits: A resistor and an inductor are connected in series to a battery. The time constant for the circuit represents the time required for the current to reach
A. 25% of the maximum current.
B. 37% of the maximum current.
C. 63% of the maximum current.
D. 75% of the maximum current.
E. 100% of the maximum current.
Answer: C
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Regarding the validity of Ptolemy's and Copernicus' theories:
A) Ptolemy was proven wrong and Copernicus was proven right. B) they were both good theories, but Ptolemy's point of view ultimately turned out to be more useful. C) the experimental facts known in Copernicus' time tended to support Copernicus' theory over Ptolemy's. D) they were both wrong and useless theories. E) they were both good theories, but Copernicus' point of view ultimately turned out to be more useful.
Approximately how many stars does a dwarf elliptical galaxy have?
A) 1 trillion B) less than a million C) 100 billion D) less than a billion E) 10 billion
The Earth's oceans evolved
A) from condensation of water vapor in a hydrogen-oxygen rich atmosphere. B) from condensation of water vapor from volcanic eruptions. C) with accumulation of rainfall. D) as Earth warmed.
The net charge of a nonionized atom
a. Depends only on the number of electrons it has. b. Is zero. c. Usually cannot be determined. d. Depends only on the number of proton it has.