When you blow some air above a paper strip, the paper rises. This is because
A)
the air above the paper moves faster and the pressure is higher.
B)
the air above the paper moves faster and the pressure is lower.
C)
the air above the paper moves faster and the pressure remains constant.
D)
the air above the paper moves slower and the pressure is higher.
E)
the air above the paper moves slower and the pressure is lower.
B
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If a material is highly opaque, then it
A) reflects most light. B) absorbs most light. C) transmits most light. D) scatters most light. E) emits most light.
Which of the following statements is(are) correct when an ideal gas goes from an initial to a final state in a single process?
a. No work is done on or by the gas when the volume remains constant. b. No energy is transferred into or out of the gas as heat transfer when the temperature remains constant. c. The internal energy of the gas does not change when the pressure remains constant. d. All the statements above are correct. e. Only statements (a) and (b) above are correct.
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A. 6.0 s B. 8.0 s C. 10 s D. 12 s
Of all the active galactic nuclei, the ________ is the most energetic
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