The diameter of the Milky Way is 100,000 ly. This distance in SI units is
A)
5 x 1015 m.
B)
1 x 1021 m.
C)
4 x 1030 m.
D)
3 x 1036 m.
E)
2 x 1042 m.
B
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This diagram represents a person's local sky. What does the red semicircle represent?
A) the horizon B) the meridian C) the zenith D) the celestial equator
In 1989, Neptune was found to have a huge storm named the
A) South Tropical Disturbance. B) Great Red Spot. C) Great Dark Spot. D) Hellas Basin. E) Galileo Regio.
Electrons that are energized to glow in the filament of a common ac lamp are
A) supplied by a wall outlet. B) supplied by a wall outlet, which in turn are supplied by your power company. C) electrons already in the filament. D) none of the above
Suppose that you wish to construct a simple ac generator having an output of 12 V maximum when rotated at 60 Hz. A uniform magnetic field of 0.050 T is available. If the area of the rotating coil is 100 cm2, how many turns do you need?
A) 16 B) 8 C) 32 D) 128 E) 64