To date, our serious searches for extraterrestrial life have been done almost entirely:
A) in Roswell and Gulf Breeze.
B) with radio telescopes.
C) with optical telescopes looking for nuclear tests.
D) with microwaves in the giant molecular clouds.
E) with infrared telescopes looking for greenhouse gases.
B
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Which of the following processes did not contribute gas to Earth's secondary atmosphere?
a. volcanism b. accretion c. oxidation d. comet impacts e. All of the above contributed gases to Earth's secondary atmosphere.
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
Leptons are the fundamental particles that are the building blocks of hadrons
Indicate whether the statement is true or false
A lunar vehicle is tested on Earth at a speed of 12 km/h. When it travels at the same speed on the Moon, is its momentum greater, less, or the same?