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An inclined member is braced with a glued block, as shown. The ultimate shear stress in the glued joint is 1050 psi. Determine the dimension X at which the glued joint will fail.

I know that

-shearstress= (Pressure x length) dived by (Area x modulus of elasticity)

- At point A there is X forces and Y forces, at point B there is Normal Force.

-Pressure max = (Shearstress X Area)

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so far i know that Force at A in the X direction is 1050x (2x2) = 4200 lbs

other than that im stuck and i dont know where to start.....any help would be appreciated.