At present, what is the primary way that the search for extraterrestrial intelligence (SETI) is carried out?
A) by seeking access to the secret records and alien corpses kept at the military's Area 51 in Nevada
B) by analyzing high-resolution images of nearby stars in search of evidence for structures that could not have developed naturally
C) by using radio telescopes to search for signals from extraterrestrial civilizations
D) by using X-ray telescopes to search for exhaust from interstellar spacecraft
E) by searching for planets around distant stars
C
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Why is the sky blue?
A) Air molecules scatter blue light more effectively than red light. B) The gases in Earth's atmosphere emit blue light. C) The Sun mainly emits blue light. D) The atmosphere transmits mostly blue light. E) Because of the way light is reflected off of the oceans.
Nellie tosses a ball upward at an angle. Neglecting air resistance, the horizontal component of the initial velocity
A) decreases with time. B) remains constant. C) increases with time.
Adobe Dreamweaver CC is an example of a ______.
A. web design tool B. plug-in C. browser D. video platform
Four long wires are perpendicular to the x-y plane. Each wire carries the same magnitude current. Wire 1 goes through point (a, a, 0) on the x-y plane, wire 2 goes through the point (–a, a, 0), wire 3 goes through the point (–a, –a, 0), and wire 4 goes through the point (a, –a, 0). Wires 1 and 3 carry their currents in the positive z direction and wires 2 and 4 carry their currents in the
–z direction. What is the direction of the resulting magnetic field at the origin? a. in the +x direction b. in the –y direction c. in the –x direction d. There is no direction since the field is zero at this point.