Most asteroids are found:
A) beyond the orbit of Neptune.
B) between the Earth and Sun.
C) between the orbits of Mars and Jupiter.
D) in the orbit of Jupiter, but 60 degrees ahead of or behind it.
E) orbiting the jovian planets in captured, retrograde orbits.
C
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What do we mean by the main-sequence turnoff point of a star cluster, and what does it tell us?
A) It is the spectral type of the hottest main-sequence star in a star cluster, and it tells us the cluster's age. B) It is the mass of the most massive star in the star cluster, and it tells us the cluster's size. C) It is the point in a star cluster beyond which main sequence stars are not found, and it tells us the cluster's distance. D) It is the luminosity class of the largest star in a star cluster, and it tells us the cluster's age.
The flat rotation curves of spiral galaxies tell us that they contain a lot of dark matter. Do they tell us anything about where the dark matter is located within the galaxy?
A) Yes, they tell us that dark matter is spread throughout the galaxy, with most located at large distances from the galactic center. B) Yes, they tell us that dark matter is concentrated near the center of the galaxy. C) Yes, they tell us that dark matter is spread uniformly throughout the galactic disk. D) No, we cannot determine anything about the location of dark matter from the rotation curve.
Movement of air aloft can influence surface air pressure; sometimes air aloft piles up—it converges—causing the surface air pressure to
A) increase and surface winds to blow away from the center of highest pressure. B) decrease and surface winds to blow away from the center of high pressure. C) increase and surface winds to blow away from the center of low pressure. D) decrease and surface winds to blow away from the center of lowest pressure.
If R = 3.0 k?, C = 6.0 nF, ? 1 = 10.0 V, Q = 18 nC, ? 2 = 6.0 V, and I = 5.0 mA, what is the potential difference Vb ? Va?
a.
?13 V
b.
+28 V
c.
+13 V
d.
?28 V
e.
+2.0 V