Different types of active galaxies are caused by different orientations of the central black hole's _______________
Fill in the blank(s) with correct word
accretion disk
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How does a lenticular galaxy differ from a spiral galaxy?
A) It has no bulge. B) It has an elongated bulge resembling a bar more than a sphere. C) It is flatter in shape. D) It has no gas or dust. E) It has no spiral arms.
In an electromagnetic wave in free space, the electric and magnetic fields are
A) parallel to one another and perpendicular to the direction of wave propagation. B) perpendicular to one another and parallel to the direction of wave propagation. C) perpendicular to one another and perpendicular to the direction of wave propagation. D) parallel to one another and parallel to the direction of wave propagation.
What is the resistance of a cylindrical metal rod 1.0 cm in diameter and 45 m long, if the resistivity of the metal is 1.4 × 10-8 ? ? m?
A) 0.0063 ? B) 0.0080 ? C) 0.80 ? D) 6.3 ?
If Venus once had an ocean, where did it go?
A) It exists as abundant water vapor in the planet's atmosphere. B) It was lost to space, stripped away by the solar wind. C) The water broke into hydrogen, which escaped to space, and oxygen, which became trapped in the planet's surface rocks. D) It exists trapped in the crust but below the surface. E) It is found in the cooler polar regions, like at the Moon and Mercury.