A ray of light enters an equilateral prism made of material with n = 1.45. What angle of incidence, 
will cause the internally refracted ray to be parallel to the base of the prism?
A. 46.5 
B. 30.0
C. 20.2 
D. 5.70
E. this cannot happen
A. 46.5
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If the dark energy is described by the cosmological constant, then the _____ Universe is ____
a. open; accelerating and will not expand forever b. flat; decelerating and will expand forever c. closed; accelerating and will expand forever d. open;, decelerating and will expand forever e. flat; accelerating and will expand forever
Iron is observed in the Sun's ________
Fill in the blank(s) with the appropriate word(s)
The largest effective telescope, created by radio interferometry, is the diameter of
A) Earth. B) the state of New Mexico. C) several football fields, in a natural depression in Puerto Rico. D) tens of miles across, in the deserts of New Mexico. E) the continental United States.
The accelerating force of the wind on a small 250-kg sailboat is 707 N northeast. If the drag of the keel is 500 N acting west, what is the acceleration of the boat?
a. 1.5 m/s2 due east c. 3.0 m/s2 northeast b. 2.5 m/s2 due north d. 2.0 m/s2 due north