As a stream flows downslope, if stream discharge doubles and the cross-sectional area of the channel also doubles, what happens to the average stream speed?
A) Average stream speed stays the same.
B) Average stream speed decreases.
C) Average stream speed increases.
D) Not enough information is given.
Answer: A
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Which of the following is true of carbonaceous chondrites?
A) They contain materials left over from the formation of the Solar System. B) They do not contain any volatile compounds. C) They are a class of iron meteorites. D) They are a class of stony-iron meteorites.
Describe the motion of an object that possesses kinetic energy yet undergoes no net displacement.
a) The object must be rolling b) The object must be sliding c) The object must be at rest d) The object must be spinning e) The object must be falling
Results from the Phoenix lander and Curiosity rover suggest that the positive result from the Viking Labeled Release experiment was probably due to
A) the destruction of organic molecules by oxygen released when perchlorates in the soil decomposed on heating B) terrestrial contamination from the robotic arm which took the samples C) a malfunction in the experiment D) high levels of radioactivity in the soil
The resistivity of the material of a wire is 1.76 × 10-8 ?m. If the diameter of the wire is 2 × 10-3 m and its length is 2 m, what is its resistance?
A) 112 ? B) 11.2 ? C) 1.12 ? D) 0.112 ? E) 0.0112 ?