Except for hydrogen, helium, and a little lithium, the lower-mass elements (lighter than iron) that are spread throughout the dust of the universe were created
A) during the shock of a supernova explosion.
B) during the fusion process that powers the stars, and then released in supernova explosions.
C) in hot white dwarf stars.
D) in the original creation of the universe.
E) in Kansas.
B
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Answer the following statement(s) true (T) or false (F)
1. Imagine that in a rectangular region of empty space between the magnetic poles of a large horseshoe magnet, the magnetic field is essentially uniform and points directly downward, but is zero outside the region’s boundary. The four vertical sides of the rectangular region are in empty space. We can easily imagine such a field, but such a field is in fact physically impossible.
An alternative to the core-accretion theory that explains the formation of the jovian planets is the:
A) differentiation theory. B) collision theory. C) gravitational instability theory. D) Big Bang theory. E) nebular contraction theory.
Parallel Wires: Two long, parallel wires carry currents of different magnitudes. If the amount of current in one of the wires is doubled, what happens to the magnitude of the force that each wire exerts on the other?
A. It is increased by a factor of 8.
B. It is increased by a factor of 4.
C. It is increased by a factor of 3.
D. It is increased by a factor of 2.
E. It is increased by a factor of 
.
The Orion Nebula, M-42, is a hot, thin cloud of glowing gas, so its spectrum is
A) a continuum, strongest in the color red. B) a few bright lines against a dark background. C) a few dark lines in the continuum. D) a continuum, but with both bright and dark lines mixed in. E) not in the visible portion of the spectrum.