9 A wooden rod of uniform cross section and of length l is hinged at the bottom of a tank which is filled with water to a height h=l/3. If the density of wood is 0.45 g/cm³, find the angle from the vertical at which the rod is in equilibrium.

(A)θ=60°
(B)θ=30°
(C)θ=45°
(D)θ=37°
(E)θ=53°

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