One of the effects of Mercury's very slow spin is:
A) extreme variations in its surface temperature.
B) an intensely powerful magnetic field.
C) tectonic activity.
D) wind patterns that are slow, but global in size.
E) large variations in the size of its polar cap.
A
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Radioactivity Basics: The atom 
Fr decays to 
Ra by emitting what kind of nuclear radiation?
A. alpha B. beta-minus C. beta-plus D. gamma E. x-rays
If more horizontal force is applied to a sliding object than is needed to maintain a constant velocity, the object
A) accelerates in the direction of the applied force. B) accelerates opposite the direction of the applied force. C) experiences greater friction. D) none of the above
Light 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
When the frequency of the light is increased in a photoelectric effect experiment, the energy of the emitted electrons __________
Fill in the blank(s) with correct word