What is a circumpolar star?
A) a star that is close to the south celestial pole
B) a star that is visible from the Arctic or Antarctic circles
C) a star that is close to the north celestial pole
D) a star that makes a daily circle around the celestial sphere
E) a star that always remains above your horizon
E
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Which of the following provides evidence for the existence of dark matter?
A. The orbital speeds of galaxies in clusters are higher than what can be accounted for by the detectable mass of the cluster. B. the ability of rich galaxy clusters to prevent their hot gases from expanding C. The orbital speeds of stars in galaxies are higher than what can be accounted for by the detectable mass in the galaxy. D. All of these choices are correct.
Scientists always try to
A) be as subjective as possible B) be as objective as possible C) disagree with the current paradigm of the time D) agree with the current paradigm of the time
Impedance: What resistance is needed in series with a 10-?F capacitor at 1.0 kHz for a total impedance of 45 ??
A. 29 ? B. 42 ? C. 61 ? D. 1.8 ?
What is the speed of an electron in the n = 4 Bohr orbit of the hydrogen atom?
A) 5.47 × 105 m/s B) 310 × 105 m/s C) 1.39 × 105 m/s D) 1.78 × 105 m/s E) 2.18 × 106 m/s