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Mechanical Properties Of Fluids

Question

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When we try to close a water tap with our fingers, fast jets of water gush through the openings between our fingers. Why?

Solution

According to the equation of continuity,

av = constant

where, 'a' is the area of cross-section, and
'v' is the velocity of the liquid.

'a' and 'v' are inversely proportional t each other.

Therefore, when we close the water tap with our fingers, the area at that point, from where water flows out, decreases and hence velocity of water increases.

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