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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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
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.
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