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Question
A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m respectively below the free surface. The position of center of pressure below the free surface will be at a distance of:
A.
3.75 m
B.
4.0 m
C.
4.2 m
D.
4.5 m
Answer ( Option C)

4.2 m

Solution

Dimensions of plane,
Depth 6 – 1.5 = 4.5 m
Width b 
Moment of inertia about cen troidal axis, 

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