The astronomical phenomenon that created the elements heavier than iron is
A) black holes.
B) supernova explosions.
C) the collapse of a star to a white dwarf.
D) neutron stars.
E) the birth [or formation] of stars.
B
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A series RL circuit is driven by a 120. V, 60. Hz source. The values of the resistance and inductance are R = 20.0 ? and L = 160. mH. Determine:
(a) the current. (b) the phase angle between the current and the applied voltage.
A body in a room at 300 K is heated to 3,000 K. The wavelength of the most intense EM radiation emitted by the body at 3,000 K is __________ times the wavelength of the most intense EM radiation at 300 K
Fill in the blank(s) with correct word
Earth's magnetic field is not stable; throughout geologic time it has changed direction. This change is attributed to
A) changes in the direction of fluid flow in the molten outer core of Earth. B) magnetic pole reversals. C) fluctuations in the time / space continuum. D) changes in the direction of fluid flow in the molten inner core of Earth.
What is the most abundant gas in Titan's atmosphere?
A) methane B) nitrogen C) oxygen D) hydrogen compounds E) argon