Which of the following is not a piece of evidence supporting the conclusion that active galactic nuclei are powered by accretion disks around massive black holes?
A) The total amount of radiation coming from the galactic center can, in some cases, exceed 100 times the total luminosity of the Milky Way Galaxy.
B) Infrared observations show that many stars are forming near the centers of active galaxies.
C) Observed radiation from the galactic center can vary significantly in brightness in times as short as a few days.
D) Spectral lines from the galactic center indicate that clouds of gas are orbiting a central object at very high speed.
E) Radio observations sometimes show long jets of material that can extend millions of light-years out from the galactic center.
B
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To double the light-gathering power of a telescope, we need to double the diameter.
Answer the following statement true (T) or false (F)
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An object is dropped from a tall building. The net force acting on the object is the difference between the object's _________ and the force of air resistance
Fill in the blank(s) with correct word