he combined action of the three forces on the base at O may be obtained by establishing their resultant through O. Det nagnitudes of R and the accompanying couple M. Assume F₁ = 320 lb, F2 = 500 lb, F3 = 580 lb, a = 6.9 ft, b=3.6 ft, c = 2.3 ft, and 0 = 42° b F₂ a
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