The rigid bar is pinned at A and supported by two aluminum rods, each having a diameter of 1 in., a modulus of elasticity E_al= 10(10³) ksi, and yield stress of (σ_Y)_al= 40 ksi. If the bar is initially vertical, determine the displacement of the end B when the force of 20 kip is applied.

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20 kip 1'ft -1.5 ft- 2'ft 1'ft -1.5 ft