Among spiral galaxies, an "SBa" has
A: no bar, tight smooth spiral arms, and a small bulge.
B: a bar, tight smooth spiral arms, and a large bulge.
C: a bar, very loose smooth spiral arms, and a moderate-sized bulge.
D: no bar, loose spiral arms, and almost no bulge.
E: a bar, jagged spiral arms, and a small bulge.
Ans: B: a bar, tight smooth spiral arms, and a large bulge.
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A. 2.0 µF B. 0.63 µF C. 3.3 µF D. 6.0 µF E. 4.5 µF
What kinds of objects are found in the Milky Way disk?
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Captain Ray, on the Galactic Explorer, sets off bright signal lights at the two ends of his spaceship so that they are seen as flashing simultaneously by General Kay, who is watch the ship go by. General Kay concludes that she was next to the midpoint of the ship at the instant when the lights flashed in her reference frame. This can only happen if Captain Ray, at the center of the Galactic
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A series circuit consists of three identical lamps connected to a battery as shown in Figure OQ28.15. The switch S, originally open, is closed. What happens to the current in the battery?