1. A student observes a very thick liquid as it flows and noticed that the velocity of particles passing through a particular point remains the same, and that the fluid layers move smoothly over each other. 
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3. She concludes that 
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5. A. The flow is turbulent.
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7. B. The flow is steady. 
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9. C. The flow is compressible.
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11. D. The flow is laminar. 
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13. E. The flow is unsteady.