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We can cut vegetables easily with a shar...

We can cut vegetables easily with a sharp knife as compared to a blunt knife. Why ?

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The area of the sharp knife is much less than the area of a blunt knife. For the applied force, pressure is more in sharp knife, (since area is less) so it cuts better.
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  9. Why the passengers are advised to remove the ink from their pens while...

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  10. We use straw to suck soft drinks, why ?

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  11. A cappilary of diameter d mm is dipped in water such that the water ri...

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  12. A cylinder of length 1.5 m and diameter 4 cm is fixed at one end. A ta...

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  13. A spherical soap bubble A of radius 2 cm is formed inside another bubb...

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  14. A block of Ag of mass x kg hanging from a string is immersed in a liqu...

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  15. The reading of pressure meter attached with a closed pipe is 5 xx 10^(...

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  16. Why coffee runs up into a sugar lump (a small cube of sugar) when one ...

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  17. Why two holes are made to empty an oil tin ?

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  18. We can cut vegetables easily with a sharp knife as compared to a blunt...

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  19. Why the passengers are advised to remove the ink from their pens while...

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  20. We use straw to suck soft drinks, why ?

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