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Find the position of centre of buoyancy for a wooden block of width 3.5 m and depth 1 m, when it floats horizontally in water. The density of wooden block id 850 kg/m3 and its length 7.0 m.

(a) 0.95

(b) 0.85

(c) 1.05

(d) 1.65

I had been asked this question at a job interview.

This key question is from Bouyancy topic in division Buoyancy and Floatation of Fluid Mechanics

1 Answer

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Right option is (b) 0.85

Easy explanation: Weight of the block=ρ*g*Volume=850*9.81*7*3.5*1=204.29 kN

                     Volume of

 water displaced= Weight of water displaced/weight density of water

                                                              = 20.825 m^3.

h=20.825/3.5*7=0.85 m.

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