High-quality energy in natural processes has a tendency to transform into
A) higher quality energy.
B) lower quality energy.
C) internal energy.
D) entropy.
E) none of the above
Answer: B
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A 30-N stone is dropped from a height of 10 m and strikes the ground with a speed of 13 m/s. What average force of air friction was exerted on the stone as it fell?
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Early in the 20th century, our galaxy was estimated to be:
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Which of the following does not provide evidence that Mars once had large amounts of flowing water?
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