The combined action of the three forces on the base at O may be obtained by establishing their resultant through O. Determine the magnitudes of R and the accompanying couple M. Assume F1 = 330 lb, F2 = 550 lb, F3 = 380 lb, a = 7.1 ft, b = 2.9 ft, c = 3.4 ft, and 50°.

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A: We find here resultant force vector.

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A: By using vector addition.

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