__________is the spherical region of a spiral galaxy, containing a thin scattering of stars, star clusters, and small amounts of gas
A) A halo
B) The central bulge
C) The disk component
D) A spiral tracer
A
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Phase Angles: A series ac circuit has a resistance of 2.0 k?, a capacitance of 8.0 ?F, and an inductance of 9.0 H. If the frequency of the alternating current is 4.0/? kHz, by what angle does the voltage lead the current?
A. +1.5 rad B. -1.8 rad C. +36 rad D. +3.1 rad E. -3.1 rad
The length of a telescope is 2.00 m and the focal length of the objective is 2.0 cm. What is the focal length of the eyepiece?
A) 200 cm B) 202 cm C) 101 cm D) 2.0 cm E) 198 cm
Current is the rate of flow of electric charge
Indicate whether the statement is true or false
If the communication lifetime of civilizations in our galaxy is 100 million years and our galaxy is 13 billion years old, what is the chance of us detecting another intelligent civilization now?
A) 1 in 1,300,000 B) 1 in 13 C) 1 in 1300 D) 1 in 130