Based on our current theory of Earth's formation, the water we drink comes from
A) ice that condensed in the solar nebula in the region where Earth formed.
B) chemical reactions that occurred in Earth's crust after Earth formed.
C) chemical reactions that occurred in Earth's core after Earth formed.
D) material left behind during the giant impact that formed the Moon.
E) comets that impacted Earth.
E
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The greatest distance above or below the ecliptic the Moon can move is
A) 5.2 degrees. B) 23.5 degrees. C) 27.3 degrees. D) 29.5 degrees. E) 30 degrees.
Radioactive decay is involved in
a. irradiating food to destroy harmful bacteria. b. keeping the interior of the Earth hot. c. making smoke detectors work. d. finding flaws in jet engine parts. e. all of the above.
Of the following conservation laws, which (if any) is not obeyed in radioactive decay?
A. energy B. momentum C. charge D. angular momentum E. All of these conservation laws are obeyed.
The primary winding of an electric train transformer has 400 turns and the secondary has 50 . If the input voltage is 120V(rms) what is the output voltage?
a. 15 V (rms) b. 30 V (rms) c. 60 V (rms) d. 2.4 V (rms) e. 960 V (rms)