All the following statements about Mars are true. Which one might have led to a significant loss of atmospheric gas to space?
A) Mars lost any global magnetic field that it may once have had.
B) The axis tilt of Mars is thought to change significantly with time.
C) Outgassed water molecules are split apart, and the oxygen then reacts chemically with surface rock on Mars.
D) Mars probably once had a much higher density of greenhouse gases in its atmosphere than it does today.
A) Mars lost any global magnetic field that it may once have had.
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If the Andromeda Galaxy collided with the Milky Way, what would most likely happen to Earth?
A) nothing B) The Sun and all its planets would be crushed by collisions with stars and planets from the Andromeda Galaxy. C) The Sun would not be disturbed, but the solar system would be ripped apart. D) The Sun would die, causing Earth to die as well.
A light woman and a heavy man jump from an airplane at the same time and open their same—size parachutes at the same time. Which person reaches a state of zero acceleration first?
A) the light woman B) the heavy man C) both at the same time D) not enough information
Which two circuits are exactly equivalent?
a.
A and B
b.
B and C
c.
C and D
d.
D and E
e.
B and E
If one metal has double the number of conduction electrons per unit volume of a second metal, then its Fermi level (energy) is how many times that of the second metal?
A) 1.41 B) 1.59 C) 2.00 D) 2.83 E) 3.22