If a charge is located at the center of a spherical volume and the electric flux through the surface of the sphere is ?0, what is the flux through the surface if the radius of the sphere doubles?
A)
0.125 ?0
B)
?0
C)
5 ?0
D)
8 ?0
E)
0.500 ?0
B
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What observational evidence supports the idea that Mercury once shrank by some 20 kilometers in radius?
A) the presence of many long, tall cliffs B) the presence of many impact craters C) the characteristics of the Caloris Basin D) Mercury's unusually high density
Duff states that equal masses of all substances have equal changes in internal energy when they have equal changes in temperature. Javan states that the change in internal energy is equal to a constant times the change in temperature for every ?T, no matter how large or how small ?T is, but that the constant is different for different substances. Which one, if either, is correct?
a. Neither, because the specific heat depends on the substance and may vary with temperature. b. Neither, because a change of state may involve release or absorption of latent heat. c. Neither because a substance may do work during a temperature change. d. All of the statements above are correct. e. Only statements (a) and (b) are correct.
A parallel plate capacitor has a paper dielectric having dielectric strength 8.00 kV/mm and dielectric constant 3.00. The plate area is 3000 
and the plate separation is 0.500 mm. If 10.0 V are applied to this capacitor, what is the charge on the capacitor?
A. 50.0 
C
B. 42.0 nC
C. 160 nC
D. 16.0 nC
E. 42.0 C
Two identical fish, both at sea level, float in two identical aquariums with identical quantities of water. Fish A is in Alaska, so it weighs more than fish B at the equator, since g is larger at sea level in Alaska. Which statement is correct?
a. A comparison is impossible unless they are both floating at the same level. b. Fish A displaces a greater quantity of water than fish B. c. Fish B displaces a greater quantity of water than fish A. d. They both displace the same quantity of water. e. Fish A has a smaller acceleration than Fish B when equal horizontal forces are applied to each, because Fish A weighs more.