A ray of light enters an equilateral prism made of material with n = 1.45 at an angle of incidence 
The internally refracted ray is parallel to the base of the prism. What is the angle of refraction for the ray leaving the prism?
A. 46.5 
B. 30.0
C. 20.2
D. 15.7
E. the ray won't leave the prism
A. 46.5
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Resistors in Combination: Three light bulbs, A, B, and C, have electrical ratings as follows:Bulb A: 96.0 W, 1.70 ABulb B: 80.0 V, 205 WBulb C: 120 V, 0.400 AThese three bulbs are connected in a circuit across a 150-V voltage power source, as shown in the figure. Assume that the filament resistances of the light bulbs are constant and independent of operating conditions. What is the equivalent resistance of this combination of bulbs between the terminals of the power source?
A. 61.5 ? B. 15.3 ? C. 74.0 ? D. 86.2 ? E. 364 ?
How do astronomers detect the movement of galaxies?
A. the steady dimming of the galaxy's light B. the disappearance of the most distant galaxies as they move past the cosmic horizon C. the shift in spectral lines of the galaxies D. the rapid brightening of the galaxy's light
What is the central equation of mass-energy equivalence?
A) W = Fd B) KE = ½ mv2 C) m = F/a D) E = mc2
What does it mean for a physical quantity in a system to be conserved?
a. It is used in the most efficient manner possible. b. It stays in its original state forever. c. The total amount of it in the system stays constant. d. none of the above.