Reactance: As the frequency of the ac voltage across an inductor approaches zero, the inductive reactance of that coil
A. approaches zero.
B. approaches one.
C. approaches infinity.
D. becomes negative.
Answer: A
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Which statement correctly locates the formation of the Earth and the appearance of the first humans on the cosmic calendar, which compresses the 14-billion year history of the universe into one "year," where "now" is exactly midnight,
A) Earth forms in January, life begins in April, and humans appear in early December. B) Earth forms in January, life begins in September, and humans appear in October. C) Earth forms in early September, life begins in late September, humans appear a few hours before midnight, Dec 31. D) Earth forms in early September, life begins in November, and humans appear on Dec 15.
A black hole can be created in a(n) ________, even more violent than supernovae
Fill in the blank(s) with correct word
What is the average value of the magnitude of the Poynting vector at 1 meter from a 100-watt lightbulb radiating in all directions?
a. 1 W/m2 b. 4 W/m2 c. 2 W/m2 d. 8 W/m2 e. 12 W/m2
An eclipse season is the period of time during which the
a. moon crosses a node in its orbit. b. sun crosses a node in the moon's orbit. c. line of nodes crosses the moon's orbit. d. the moon is new or full. e. the moon is visible during the day.