Heavy rains in a desert environment can result in
A) flash floods.
B) cross-bedding.
C) intensified dune migration.
D) floodplains.
Answer: A
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Consider two mercury barometers, one with twice the cross-section area of the other. Mercury in the wider tube will rise
A) to the same height as in the narrow tube. B) twice as high as mercury in the narrow tube. C) four times as high as mercury in the narrow tube. D) more than four times as high as in the narrow tube. E) none of the above
Conservation of Momentum: A 14,000-kg boxcar is coasting at 1.50 m/s along a horizontal track when it suddenly hits and couples with a stationary 10,000-kg boxcar. What is the speed of the cars just after the collision?
Fill in the blank(s) with the appropriate word(s).
Thin Lenses: A convex lens has focal length f. If an object is placed at a distance beyond 2f from the lens on the principal axis, the image is located at a distance from the lens
A. of 2f. B. between f and 2f. C. of f. D. between the lens and f. E. of infinity.
The vast majority of pulsars are known only from their pulses in:
A) X-rays. B) gamma-rays. C) visible light. D) microwaves. E) radio waves.