A 30-?F capacitor is charged to 40 V and then connected across an initially uncharged 20-?F capacitor. What is the final potential difference across the 30-?F capacitor?
A. 15 V
B. 24 V
C. 18 V
D. 21 V
E. 40 V
Answer: B
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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
An optic fiber is made of clear plastic with index of refraction of 1.50. For what angle of incidence will light remain within the plastic "guide"?
A) >21.1° B) >23.4° C) >38.3° D) >40.3° E) >41.8°
When you walk barefoot in a room, the floor feels cooler walking on a tile floor as compared to a wooden floor because
A) tile has a smaller specific heat than wood. B) tile has a larger specific heat than wood. C) tile has a smaller thermal conductivity than wood. D) tile has a larger thermal conductivity than wood. E) none of the above
The creation of elements inside a star is called ______________
Fill in the blank(s) with correct word