In the context of the unified model of active galactic nuclei (AGN), if you view the accretion disk of a galaxy from the edge, you may be able to see some of the intensely hot gas in the central cavity
Indicate whether the statement is true or false
False
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In a diagram of electric field lines, q1 has 9 lines going into it and q2 has 27 lines going out of it. If one of the charges is -40 mC, which of the following could be the other one?
A. -120 mC B. 18.0 mC C. -18.0 mC D. 120 mC E. none of the these choices are correct
Suppose that 
both have nonzero y and z components, but both also have zero x components. Which components of 
are nonzero? Select or indicate all the letters that apply.
A. 
is nonzero.
B. 
is nonzero.
C. 
is nonzero.
What do you expect the spectrum of an object that is 1,000,000 Kelvin to be like?
a) It should give off less total light than the Sun. b) It should peak at violet wavelengths. c) It should peak at X-ray wavelengths. d) It should give off about 10 times more total light than the Sun. e) It should peak at radio wavelengths.
Doppler Effect: Two in-phase loudspeakers are some distance apart. They emit sound with a frequency of 536 Hz. A microphone is moved between the speakers along the line joining the two speakers with a constant speed of 1.60 m/s. What beat frequency is observed? The speed of sound in air is 343 m/s.
A. 5.00 Hz B. 6.00 Hz C. 7.00 Hz D. 8.00 Hz E. 9.00 Hz