Titan is roughly the same size as Mercury, yet Titan has an atmosphere while Mercury does not. How can this be?
A) Although Titan is roughly the same size as Mercury, it is much denser, making its gravitational field stronger
B) Unlike Mercury, Titan is constantly being bombarded by icy comets that evaporate and maintain its atmosphere
C) On its surface, Titan has volcanism that is constantly replenishing its atmosphere while Mercury does not
D) Even though Titan's gravity is weak, it is much colder, allowing molecules to be trapped in its atmosphere
D
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Which of the following is not caused by side branches on a polymer?
(a) Decreased density (b) Decreased transparency (c) Decreased crystallinity (d) Decreased hardness
How long does light take to reach us from Proxima Centuri?
a. 4.2 ly b. 4.2 years c. 8.4 AU d. 8.4 km
A 2.0-m wire carries a current of 15 A directed along the positive x axis in a region where the magnetic field is uniform and given by B = 
mT. What is the resulting magnetic force on the wire?
A.
) NB.
) NC.
) ND.
) NE.
) NLight of intensity I0 and polarized horizontally passes through three polarizes. The first and third polarizing axes are horizontal, but the second one is oriented 20.0° to the horizontal. In terms of I0, what is the intensity of the light that passes through the set of polarizers?
A) 0.780I0 B) 0.180I0 C) 0.442I0 D) 0.883I0