Some features on Mars attributed to flooding may have been caused by temporary heating events like
A) impacts
B) volcanic eruptions
C) lightning
D) Both A and B
D
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A conducting sphere of radius 20 cm has a charge Q placed on it producing a field of magnitude
If the potential at the surface was
when the field was 
what is the potential when the field is 2
?
A.
B. 2
C. 4
D. 5
E. 16
What is the minimum thickness of the air layer between two flat glass surfaces if the glass is to appear bright when 450 nm light is incident normally?
A. 57.0 nm B. 113 nm C. 170 nm D. 226 nm
What is at the center of the Milky Way?
A: A supermassive (> 1 million solar masses) black hole B: A cluster of young, hot stars zooming around C: The center of the bulge/bar D: The loud radio source known as Sag A* E: All of the above
In Young's two-slit experiment, a beam of light from a slit reaches at a point on the screen one wavelength behind the wave from the other slit. What is observed on the screen at that point?
A) Dark fringe B) An empty space C) Bright-dark fringe D) Dark-bright fringe E) Bright fringe