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CBSE Class 11-science Answered

Applications of Bernoulli's theorem can be seen in : 
a. dynamic lift of airplane
b. hydraulic press
c. helicopter
d. none of the above
Asked by vanshraaj.ind | 13 Dec, 2020, 06:06: PM
Expert Answer
Application of Bernoull's theorem can be seen in dynamic lift of air plane . 
 
Wings of air plane is shaped in a such a way , wind flowing above is faster than wind flowing below the wing.
 
Hence by bernoulli's principle , pressure is low at top due to higher velocity but pressure is high at bottom of the wind due to slower velocity.
 
This pressure difference gives a lift in upward direction 
 
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Hydraulic press works on the principles of Pascal law
 
The external static pressure applied on a confined liquid is distributed or transmitted evenly throughout the liquid in all directions.
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In Helicopter , when rotor blades rotates very fast, air is getting sucked downwards and ejected out at very high speed.
 
This gives a thrust upward to helicopter to go upward
Answered by Thiyagarajan K | 13 Dec, 2020, 11:46: PM
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