Total Internal Reflection: A point source of light is positioned 20.0 m below the surface of a lake. What is the diameter of the largest circle on the surface of the water through which light can emerge into the air? The index of refraction of water is 1.33.
Fill in the blank(s) with the appropriate word(s).
45.6 m
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Two carbon cylinders have radii 2r and r and the first has length 2L, while the second has length L. What is the resistance of the first if the resistance of the second is 12 
A. 48 
B. 6
C. 12
D. 24
Stars of spectra type K have strong Balmer lines
Indicate whether the statement is true or false
The Virgo cluster
a. is the galactic cluster that contains the Milky Way. b. is the oldest known cluster of galaxies. c. is located at the center of the universe. d. contains mostly spiral galaxies and very few elliptical galaxies. e. is a rich cluster and the closest cluster of galaxies outside of the Local Group.
Air is flowing straight toward a building. What expression would provide ?p/?x if x is measured perpendicular to the building? Neglect viscous and gravity effects and assume steady flow.
(A) ?p/?x = ?? (u?u/?x ? v?v/?y) (B) ?p/?x = ?? u?u/?x (C) ?p/?x = ?? v?u/?x (D) ?p/?x = ?? (u?u/?x ? v?u/?y)