A hole of radius R/4 is drilled in the cylinder at a distance of 2R/3 from the center parallel to the axis (Fig. 10). The hole is filled with a substance whose density is 11 times greater than the density of the substance of the cylinder. The cylinder lies on a board, which is slowly lifted at one end. What is the maximum angle of inclination of the plate at which the cylinder can still be in equilibrium on it? Friction coefficient k = 0.3.
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