At present, what is the primary way that the search for extraterrestrial intelligence (SETI) is carried out?
A) by using radio telescopes to search for signals from extraterrestrial civilizations
B) by analyzing high-resolution images of nearby stars in search of evidence for structures that could not have developed naturally
C) by searching for planets around distant stars
D) by using x-ray telescopes to search for exhaust from interstellar spacecraft
E) by seeking access to the secret records and alien corpses kept at the military's Area 51 in Nevada
A) by using radio telescopes to search for signals from extraterrestrial civilizations
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The quark flavors are
A. up, down. B. red, green. C. muon, pion. D. cyan, magenta. E. lepton, gluon.
When a glass rod rubbed with silk acquires a positive charge, the silk acquires
A. a positive charge B. a negative charge C. no charge D. it is impossible to tell which sign of charge it acquires
An object is not accelerated if
A) it is acted upon by an external influence. B) its speed remains unchanged while its direction of motion changes. C) its speed and its direction of motion are both unchanging. D) its speed changes while its direction of motion remains unchanged. E) both answers B and D are correct.
In an AC series circuit the capacitive reactance is 253 W and frequency is 100 Hz. What is the capacitance?
a. 6.29 mF c. 50.0 mF b. 8.0 mF d. 3.2 mF