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Why does a needle float on clear water, ...

Why does a needle float on clear water, but sinks when some detergent is added to water?

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BINA LIBRARY-PROPERTIES OF FLUIDS-EXERCISE
  1. Explain why rain drops are spherical while the surface of water in a p...

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  2. Why water wets glass, but not mercury?

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  3. Why does a needle float on clear water, but sinks when some detergent ...

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  4. Why does oil spread over the surface of water?

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  5. Can two streamlins cross each other?

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  6. Distinguish between streamline and turbulent flow of a liquid.

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  7. Why does velocity increase when water flowing in broader pipe enters a...

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  8. Why does deep water run slow?

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  9. Why does a flag flutter in breeze?

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  10. If a person stands near a fast moving train, there is a possibility of...

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  11. A ball-bearing falling in a tall jar of motor oil attains a constant v...

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  12. Water flows faster than honey-- explain the reason?

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  13. A bigger rain drop falls faster than smaller one. Why ?

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  14. Dust generally settles down in a closed room. Why?

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  15. Machine parts are jammed in winter. Why ?

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  16. Find the work done in blowing a soap bubble of surface tension 30xx10^...

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  17. A drop of water 1mm radius is split into 64tiny drops. Find the increa...

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  18. Calculate the energy spent in sprying a drop of mercury of 1 cm radius...

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  19. In a capillary tube of diameter 10^-3m, water rises to a height of 0.0...

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  20. Water rises in a capillary tube to a height 2cm. In another capillary ...

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