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Why is dust particles settled down on fl...

Why is dust particles settled down on floor in a closed room ?

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Dust particles are of small spheres .Their terminal velocity is small due to small radius. Hence, after some time they settle down on floor.
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KUMAR PRAKASHAN-MECHANICAL PROPERTIES OF FLUIDS -SECTION -C (Objective Questions) (VSQs)
  1. Which falls faster , big rain drops or small rain drops ?

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  2. Why not rain drops do not posses greater velocity than some velocity ?

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  3. Why is dust particles settled down on floor in a closed room ?

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  4. Give an illustration of steady flow.

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  5. Explain Reynolds Number.

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  6. What is the value of Reynolds number for streamline flow ?

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  7. What is the value of Reynolds number for unsteady flow ?

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  8. What is the value of Reynold's number for turbulent flow ?

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  9. What is inertial force ?

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  10. Which of the ratio of forces represents the Reynolds number Re ?

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  11. Why does fluid flow faster at a narrow tube ?

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  12. Which fundamental law forms the basis of equation of continuity ?

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  13. Which types of energies are present in streamline flow of fluid ?

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  14. Which fundamental law forms the basis of Bernoullis equation ?

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  15. Write Bernoulli's principle in word.

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  16. Why is it dangerous to stand on the edge of platform near the line ,wh...

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  17. Why two rowing boats moving parallel to each other come closer (attrac...

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  18. When a fluid passes through a constricted part of a pipe ,what happens...

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  19. Why does a flag (or ensign) flutter when there is strong wind ?

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  20. Explain why roof of building flyout during stormy wind.

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