Unlike the atmospheres of Jupiter and Saturn, Uranus and Neptune have almost no:
A) Hydrogen.
B) Helium.
C) Methane.
D) Ammonia.
E) Nitrogen.
D
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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 above
The Doppler shift applies only to the line spectrum. It does not apply to the continuous (blackbody) spectrum.
Answer the following statement true (T) or false (F)
From the Sun, the distance to the Galactic Center is about:
A) 8 pc. B) 8,000 pc. C) 100,000 pc. D) 225 million pc. E) 100 billion pc.
The figure shows a cross section of three parallel wires each carrying a current of 20 A. The currents in wires A and B are out of the paper, while that in wire C is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 2.0-m length of wire A?
a.
23 mN
b.
64 mN
c.
32 mN
d.
46 mN
e.
55 mN