A wind with speed 
blows parallel to the roof of a house. The area of the roof is 
. Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be ( 
)
A
, downwards B
, upwards C
, upwards D
, downwards
Text Solution
Verified by ExpertsThe correct answer is:
C
From Bernoulli's theorem
Force acting on the roof is given by
As the pressure inside the roof is more than outside to it. So, the force will act in the upward direction,
i.e. 
- upwards.
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