A lunar eclipse can only happen during a
A) new Moon.
B) equinox.
C) full Moon.
D) perigee.
E) aphelion.
C
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Parallel-Plate Capacitor: An ideal parallel-plate capacitor having circular plates of diameter D that are a distance d apart stores energy U when it is connected across a fixed potential difference. If you want to triple the amount of energy stored in this capacitor by changing only the size of its plates, the diameter should be changed to
A. 9D.
B. 3D.
C. D
D. 
E. 
Physically, why is a gas molecule’s speed v more likely to be near vp than near zero?
A. There are fewer quantum states with smaller speeds than larger speeds.
B. The Boltzmann factor has a larger value near v = vp than near v = 0.
C. We know that 
What do we mean by time dilation in relativity?
A) It is the idea that time really runs slower in reference frames moving relative to you. B) It is the idea that time seems to run slower in reference frames moving relative to you, but time really is the same for everyone. C) It is the idea that relativity makes time dilate, or expand, for people who study it. D) It is a hallucinogenic effect experienced by people who take too much of something.
In a Maxwell solid, when a stress is applied at t=0, the total strain is equal to the _________strain.
Fill in the blank(s) with the appropriate word(s).