A rectangular surface 3' x 4', has the lower 3 edge horizontal and 6' below a free oil surface (sp. gr. 0.8). The surface inclination is 300 with the horizontal. The force on one side of the surface is(where, y = specific weight of water)
A. 39.6y
B. 48y
C. 49.2y
D. 58y
Answer: Option B
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0.8y*12*{6-2cos60} =48y.
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