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Q.

When strong/high speed wind blows, an umbrella held upright at times gets upturned.Which one of the below mentioned reasons is correct?


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a

High speed wind passing over the umbrella creates low pressure

b

High speed wind passing over the umbrella creates high pressure

c

High speed wind passing over the umbrella creates equal pressure

d

None of these. 

answer is A.

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Detailed Solution

High-speed wind passing over the umbrella creates low pressure.
Therefore, the umbrella was upturned by the Bernoulli principle. On the other hand, when high-speed wind passes over the umbrella, low pressure is created above it, and high pressure is inside the upper portion. As a result, air flows from high to low pressure, upturning the umbrella.
 
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