A parallel plate capacitor has a dielectric with constant 3.5. The plates are circular with radius 0.07 m, and the separation gap is 0.375 mm. What energy may be stored in this capacitor if 1250 V is the applied voltage?
a. 
b. 
c. 
d. 
a.
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A 4-cm-diameter cylindrical enclosure with black surfaces, as shown in the accompanying sketch, has a 2-cm hole in the top cover. Assuming the walls of the enclosure are at the same temperature, determine the percentage of the total radiation emitted from the walls that escapes through the hole in the cover.
GIVEN
• Cylindrical enclosure of black surfaces shown above
• Cylinder diameter (D) = 4 cm = 0.04 m
• Diameter of hole in top (Dh) = 2 cm = 0.02 m
FIND
• The percentage of the total radiation emitted from the wall which will escape through the hole in the cover (Fe4).
ASSUMPTIONS
• The walls of the enclosure are at the same temperature
If a foreign atom is more than _____________% larger than its host, it normally does not form a continuous substitutional solid solution.
Fill in the blank(s) with the appropriate word(s).
Numerous meteorites found on Earth originated from which planet?
a. Mercury b. Venus c. Mars d. Jupiter e. Saturn
Dimensional Analysis: When multiplying several quantities
A. the quantities can have any combination of units. B. the quantities must all have exactly the same units. C. the quantities must all be dimensionless.