At what temperature is the Celsius temperature and the Fahrenheit temperature are same?
A. 30
B. 35
C. -40
D. 45
E. -30
C. -40
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What is the speed of light in a material that has an index of refraction of 2.0?
A. 
B. 
C. 
D. 
E. No such index can exist.
Velocity Addition: Two spaceships are traveling through space at speeds of 0.600c and 0.900c, respectively, with respect to Earth. If they are headed directly toward each other, what is their approach speed (in terms of the speed of light) as measured by the captain of either ship?
Fill in the blank(s) with the appropriate word(s).
A long solenoid with closely spaced turns carries electric current. Each turn of wire exerts:
1.an attractive force on the next adjacent turn. 2.a repulsive force on the next adjacent turn. 3.zero force on the next adjacent turn. 4.either an attractive or a repulsive force on the next turn, depending on the direction of current in the solenoid.
The speed of light in a certain medium is 2.2 × 108 m/s. What is the index of refraction of this medium?
A) 1.0 B) 1.2 C) 1.4 D) 1.6 E) 1.8