Explanation
Application of Bernoulli’s theorem.
Movement of spinning ball, carburetor of automobile, heart attack and dynamic lift of an aeroplane all are based on the Bernoulli's principle.
Height of the blood column in the human body is more at feet than at the brain. As P = hρg, therefore the blood exerts more pressure at the feet than at the brain.
Since, due to applied force on liquid, the pressure is transmitted equally in all directions inside the liquid. That is why there is no fixed direction for the pressure due to liquid. Hence, hydrostatic pressure is a scalar quantity.
When two holes are made in the tin, air keeps on entering through the other hole. Due to this the pressure inside the tin does not become less than atmospheric pressure which happens only when one hole is made.
The level of water does not change. The reason is that on drinking the water (say m gm), the weight of man increases by m gm and hence water displaced by man increases by in gm, tending to raise the level. However, this much amount of water has already been consumed by the man. Therefore the level of pond remain same.
In a stream line flow of a liquid, according to equation of continuity av = Constant.
Where a is the area of cross-section and v is the velocity of liquid flow. When water flowing in a broader pipe enters a narrow pipe, the area of cross-section of water decreases therefore the velocity of water increases.
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