Four signs are mounted on a frame spanning a highway, and the magnitudes of the horizontal wind forces acting on the signs are as shown. Determine a and b so that the point of application of the resultant of the four forces is at G.

A P KN Refer to the figure. d₁ 0.9 m Force P is 60 kN and each force Q is 125 kN. Q KN B Add your answer Integer, decimal, or E notation allowed Q KN The diameter d₁ = 30 mm and diameter d₂ = 50 mm. d₂ 1.2 m What is the normal stress in rod BC in MPa? Round to the nearest integer and enter the magnitude only. C

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