An object having mechanical energy must have
A. momentum.
B. kinetic energy.
C. both of these
D. none of the above
Answer: D
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A) driving a hybrid car using ethanol B) recycling aluminum to the nearest industry C) eating organically D) switching to all compact fluorescent bulbs for lighting E) increasing home insulation
The following language has become a lingua franca of approximately 335 million people as a first language, 375 million as a second language and 600 million as a foreign language
A) English B) Chinese C) French D) Spanish
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What kind of environmental issues are related to fossil fuel use?
a. Marine oil spills b. Acid rain c. Increase of carbon dioxide (CO2) in the atmosphere d. Ground sink e. All of the above