Determine the angle for equilibrium of the uniform 10-kg link with mass center at G as its position in the vertical plane is influenced by the 80-N horizontal force applied to its end. The spring has a constant of 1.5 kN/m and is unstretched when = 0.
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The uniform link AB has a mass m, and its left end A travels freely in the fixed horizontal slot. End B is attached to the vertical plunger, which compresses the spring as B falls. The spring would be uncompressed at the position = 0. Determine the angle for equilibrium (other than the impossible position corresponding to ) and designate the condition which will ensure stability.