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∑Mo = 0
∑Mo = Rb x 4m - 60Nx4m - 40Nxsen30(3m) - 400Nx2m - 50Nxsen70(1m)
Rb = [60Nx4m + 40Nxsen30(3m) + 400Nx2m + 50Nxsen70(1m)] / 4m
Rb = 287 N
Luego Segunda ley de Newton:
∑Fx = 0
50NCos70 - 40NCos30 = 0
∑Fy = 0
Ra + Rb - 50sen70 - 400N - 40Nsen30 - 60N = 0
Ra = 527N - Rb
Ra = 527N - 287 N
Ra = 240 N