What is the approximate thrust exerted by air on the human body?

The average surface area of human body is about 1.5m2.
The atmospheric pressure is about 1 x 10
5N/m2.

We have, 
Pressure, P = FA  F = P×A

Therefore,
Thrust exerted by air = 1.5x10
5N. 
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Why high blood pressure patients are not advised to go at high altitudes?

the atmospheric pressure decreases as we go higher. So, at higher altitudes, the blood pressure is greater than atmospheric pressure. If a person already has the problem of high pressure, the difference between blood pressure and atmospheric pressure becomes so high. This results in bleeding from the nose or ears and in some cases the veins burst. 


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What are practical applications of Pascal's law?

The practical application of Pascal's law are:

(i) Hydraulic lift
(ii) Hydraulic press
(iii) Hydraulic brake.
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Due to atmospheric pressure, the air exerts a force of 1.5x105N. This force is equivalent to if we place 15000kg weight on our body. Why we do not get squeeze or get crushed under such a high force?

Given that, 
Air exerts a force of 1.5 × 105 N 

We do not get squeezed or crushed under such a high force because our body is able to bear such a heavy weight as body contains tiny pores. The air exerts pressure from inside. Also, there is blood pressure which is exerted from inside. 

Both these pressure combine and balance the atmospheric pressure which is exerted, enabling us to tolerate such a huge pressure without getting crushed. 
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Why the foundation of high building is made wide?


The whole weight of building is on the foundation. The foundation of building should be made wide enough otherwise, the stress on the earth will be greater than the stress at which the earth yields and hence building will tend to collapse. 
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