Which one of the following represent correct units for electric filed strength?
a. T
b. N/C
c. J / C
d. N • m 2 • C-2
Answer: b. N/C
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An AC circuit consists of a 60-Hz source, a 200-? resistor, and a 1.06-H inductor, all in series. What is the impedance of this circuit?
a. 400 ? b. 280 ? c. 600 ? d. 450 ?
Besides Earth, which of the terrestrial planets and/or satellites of terrestrial planets show(s) evidence for the possible existence of liquid water flowing on its surface in the past?
a. Venus b. the Moon c. Phobos d. Mars e. None of the terrestrial planets or satellites show such evidence.
Which dwarf planet did the NASA New Horizons spacecraft flyby in 2015?
A) Pluto B) Eris C) Ceres D) Haumea
You discover a binary star system in which one member is a 15 solar mass main-sequence star and the other star is a 10 solar mass giant star. Why should you be surprised, at least at first?
A) The two stars should be the same age, so the more massive one should have become a giant first. B) The two stars in a binary system should both be at the same point in stellar evolution; that is, they should either both be main-sequence stars or both be giants. C) It doesn't make sense to find a giant in a binary star system. D) A star with a mass of 15 solar masses is too big to be a main-sequence star. E) The odds of ever finding two such massive stars in the same binary system are so small as to make it inconceivable.