On a floodplain, the sediment grains away from the main river channel are
A) coarse-grained sand and gravels.
B) fine-grained silts and clays.
C) well-sorted and well-rounded sand particles.
D) all of these
Answer: B
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Some narrow rings of Saturn are seen in space probe photos to be caused by
a. gravitational interactions between ring particles. b. a spiral density wave which confines them. c. the magnetic field which holds them in place. d. small shepherd moons that orbit inside and outside the rings
Suppose there are 3 molecules in a container. If each molecule has a 1-in-2 chance of being in the left half of the container, what is the probability that there are exactly 2 molecules in the left half of the container?
a. 1/2 b. 1/3 c. 1/8 d. 3/8 e. 3/5
A 20-cm length of wire is held along an east-west direction and moved horizontally to the north with a speed of 3.0 m/s in a region where the magnetic field of the earth is 60 ?T directed 30° below the horizontal. What is the magnitude of the potential difference between the ends of the wire?
a. 36 ?V b. 18 ?V c. 31 ?V d. 24 ?V e. 21 ?V
At very low temperatures the resistivity of some materials becomes zero as indicated by high precision measurements. This phenomenon is known as
A) supercapacitance. B) superconductivity. C) BSCCO. D) superresistivity. E) supraresistivity.