For the beam shown in the figure, the allowable bearing stress for the material under the supports at A and B is σb = 900 psi. Assume that w = 2,000 lb/ft, P = 4,500 lb, a = 20 ft, and b = 8 ft. Determine the size of square bearing plates required to support the loading shown.  The size of the square bearing plate at support A is _____ inches The size of the square bearing plate at support B is _____ inches

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