In the double-exhaust model, the radio lobes of a radio galaxy are inflated by
a. jets of excited gas flowing from the central galaxy.
b. jets of high-energy sound waves flowing from the central galaxy.
c. a disk of ionized material that orbits very near a supermassive black hole.
d. dark clouds of very cold gas and dust.
e. None of the other choices are correct.
a
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Jupiter's interior is mostly liquid helium
Indicate whether the statement is true or false
Which of the following best described the major ingredients of the jovian planets?
A) rocky minerals and water B) hydrogen, helium, and hydrogen compounds C) rock and metal D) hydrogen compounds and carbon dioxide E) hydrogen and helium only
The amount of diffraction and thus the resolution of the telescope depends upon
A) the brightness of the object. B) the size and sensitivity of the CCD chip used for imaging. C) the design of the telescope. D) whether the telescope is a reflector or refractor. E) the wavelength used and the size of the main telescope objective lens or mirror.
A -3.0-?C point charge and a -9.0-?C point charge are initially extremely far apart
How much work does it take to bring the -3.0-?C charge to x = 3.0 mm, y = 0.00 mm and the -9.0-?C charge to x = -3.0 mm, y = 0.00 mm? (k = 1/4??0 = 8.99 × 109 N • m2/C2) A) 40 J B) 81 J C) 27 J D) 6.8 J