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The A-36 steel rod has a diameter of 50mm and is lightly attached to the rigid supports at A and B when T1 = 50?C. Determine the force P that must be applied to the collar at its midpoint so that, when T2 = 35?C, the reaction at B is zero.
2-) The three bars are made of A-36 steel and form a pin-connected truss. If the truss is constructed when T1=50?F, determine the vertical displacement of joint A when T2=150?F. Each bar has a cross-sectional area of 2 in2.
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