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Why is it the needle may float on clean ...

Why is it the needle may float on clean water but will sink when some soap is aded to water.

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MBD PUBLICATION-MECHANICAL PROPERTIES OF FLUID (LIQUID AT REST)-QUESTION BANK
  1. A mercury drop does not wet glass whereas a water drop sticks to glass...

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  2. Explain surface energy. How it is connected with surface tension?

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  3. Find the work done in doubling the diameter of soap bubble.

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  4. Water rises to a height h in a glass capillary tube when dipped vertic...

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  5. Why does soap help cleaning clothes?

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  6. Calculate the excess inside a soap bubble of radius 5mm, given surface...

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  7. Why is it the needle may float on clean water but will sink when some ...

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  8. The capillary rise in a tube is 12cm, when dipped in a given liquid, w...

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  9. Define surface tension. Show that this is a molecular phenomenon.

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  10. Explain surface energy. How it is connected with surface tension?

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  11. Derive an expression for the capillary rise of a liquid.

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  12. Derive an expression for the excess pressure inside a soap bubble. Wha...

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  13. Discuss the condition for determination of the shape of liquid meniscu...

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  14. explain what is meant by surface energy of a liquid. Show that surface...

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  15. The excess of pressure inside a soap bubble than that of the outer pre...

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  16. Distinguish between surface tension and surface energy.

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  17. Define surface tension and angle of contact. Derive an expression for ...

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  18. Define surface tension . Derive an expression for the excess pressure ...

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  19. Describe an experiment to determine surface tension of water in the la...

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  20. Derive an expression for the excess pressure inside a soap bubble. Wha...

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