Before a thunder storm, clouds in the sky likely become
A) conducting.
B) polarized.
C) grounded.
D) a field-free region.
Answer: B
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Ancient astronomers often saw certain planets viewed, while viewed from Earth, slowly stop and then move westward, of which they called this movement _______________
Fill in the blank(s) with correct word
Lake Superior has a shoreline of length 2726 miles. What would be its area in 
if it were a perfectly circular lake? One mile is 1.609 km.
A. 
B. 
C. 
D. 
E. 
F. 
Neon atoms in a glass tube can be excited
A) once per atom. B) repeatedly. C) by infrared light.
A lighted candle is 10 m away from a wall. A concave mirror is being used to project an image of the candle onto the wall. If the image is going to be 3.0 times the size of the object, how far should the mirror be from the wall?
A) 6.5 m B) 7.0 m C) 6.0 m D) 5.5 m E) 15 m