In the unified model of active galactic nuclei, the broad line region in an active galactic nucleus is
a. composed of clouds of gas and stars moving at very high orbital velocities near a supermassive black hole.
b. composed of a supermassive black hole surrounded by empty space.
c. responsible for producing the bright continuous radiation from within the event horizon.
d. responsible for the narrow absorption lines seen in Type 2 Seyfert galaxies.
e. located far from the core beyond the disk of stars of the galaxy.
a
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By comparing the two images, what can you conclude about Io's volcanoes?
A) Every black spot in the visible image has a bright spot in the infrared image, so all of Io's volcanoes were active when the photos were taken. B) There are more black spots in the visible image than bright spots in the infrared image, so many of Io's volcanoes were inactive when the photos were taken. C) There are more bright spots in the infrared image than black spots in the visible image, so new eruptions must have started after the visible photo was taken.
What might explain how the core formed?
A. the magnetic field pulling it inward B. asteroids hitting and penetrating C. iron sinking to the core as the bulk of Earth melted D. Earthquakes shake the planet and the iron gradually "sifts" downward. E. The silicon of the crust decays into iron at high temperatures.
A rectangular plate (a 5 120 mm, b 5 160 mm) is subjected to compressive stress ?x 5 24.5 MPa and tensile stress ?y 5 15 MPa. The ratio of the normal stress acting perpendicular to the weld to the shear stress acting along the weld is approximately:
(A) 0.27
(B) 0.54
(C) 0.85
(D) 1.22
Newton found that gravity varied with the ________ of the distance between the two bodies pulling on each other
Fill in the blank(s) with correct word