A ball rolls along a horizontal track with a dip in it. While in the dip its kinetic energy is
A. less.
B. more.
C. the same.
D. need more information
Answer: B
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Why is the city of Phoenix, Arizona experiencing land subsidence?
A. overpumping of aquifers B. collapse of old mines C. earthquakes D. weight of newly filled reservoir
In a dry climate, ____
a. there are no plants b. potential evaporation and transpiration exceed precipitation c. there is no precipitation d. precipitation exceeds potential evaporation and transpiration e. winters are short, but cold
According to the second law of thermodynamics,
a. energy cannot be created or destroyed. b. things tend to move toward a more disorderly state. c. matter can be created, but not energy. d. kinetic energy is the most efficient source of energy.
The Vostok ice core was collected to 3,100 feet below the surface, and has revealed ________ years of climate data.
A. 420,000 B. 500,000 C. 100,000 D. 42,000