Based on our current theory of Earth's formation, the water we drink likely 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) water-bearing planetesimals that formed beyond the frost line and then impacted Earth.
E) water-bearing planetesimals that formed beyond the frost line and then impacted Earth.
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The key to identifying a black hole candidate in a binary system is that
A) one of the two stars cannot be seen. B) the unseen companion in the system must have a sufficiently high mass. C) the unseen star is a contact binary. D) the system must be a very strong source of radio emissions. E) the visible companion must be an evolving main sequence or giant star.
Most of the extrasolar planetary systems discovered to date are
A) very similar to our own solar system with inner rocky terrestrial planets and outer gaseous Jovian planets B) similar to our solar system in having inner rocky terrestrial planets but different in having no Jovian planets C) identical to our own with the same number and types of planets as our own solar system D) quite different than our own solar system, many with Jovian planets found close to their parent stars
Electrons in glass have a natural frequency in the
A) infrared region of the spectrum. B) visible region of the spectrum. C) ultraviolet region of the spectrum.
A small styrofoam ball of mass 0.120 g is placed in an electric field of 6000 N/C pointing downward. What excess charge must be placed on the ball for it to remain suspended in the field?
A) -16.0 nC B) -18.0 nC C) -57.2 nC D) -125 nC E) -196 nC