A dielectric material such as paper is placed between the plates of a capacitor holding a fixed charge. What happens to the electric field between the plates?
A)
no change
B)
becomes stronger
C)
becomes weaker
D)
reduces to zero
E)
cannot be determined without additional information
C
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A diver shines light upward to the surface of a smooth pond at 20° to the normal. Most light passes into the air above while the part that reflects back into the water makes an angle to the normal of
A) less than 20°. B) 20°. C) more than 20°. D) all refracts, none reflects.
A 9.0-V battery moves 200 mC of charge through a circuit running from its positive terminal to its negative terminal. How much energy was delivered to the circuit?
a. 4.5 x 103 J c. 2.2 mJ b. 1.8 J d. 0.18 J
A 2 inch diameter fluorescent light is mounted horizontally as shown. Estimate the heat transfer per unit area if the light surface is 85ºF and the surrounding air is 65ºF.
At which of the following temperatures would we expect gas molecules to have half the energy that they have at 100.°C?
A) 93. K B) 50.°C C) -86.°C D) -56.°C E) 323. K