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in Fluid Mechanics by (118k points)
A rectangular plan surface 5 m wide and 7 m deep lies in water in such a way that its plane makes an angle 60⁰  with the free surface of water. Determine the total pressure force when the upper edge is 3 m below the free surface.

(a) 311.15 N/cm^2

(b) 622.3 N/cm^2

(c) 155.5 N/cm^2

(d) None of the mentioned

I had been asked this question during an online interview.

Question is from Horizontal and Inclined Plane Surface Submerged in a Liquid topic in section Hydrostatic Forces on Surfaces of Fluid Mechanics

1 Answer

+1 vote
by (362k points)
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Best answer
Correct option is (a) 311.15 N/cm^2

Explanation: Total pressure, F=w*a*ŷ=w*A*(y+dsinθ)=9.81*1000*35*(3+7sin60)=311.15 N/cm^2.

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