PROBLEM 10.6 An unstretched spring of constant 4 lb/in. is attached to pins at points Cand Ias shown. The pin at B is attached to member BDE and can slide freely along the slot in the fixed plate. Determine the force in the spring and the horizontal displacement of point Hwhen a 20-lb horizontal force directed to the right is applied (a) at point E, (b) at points Dand E. SOLUTION First note: 33GDGDxxxxδ=⇒=44HDHDxxxx=55IDIDx=⇒=(a) Virtual Work: 0:0EE SPIUFxFxδδ=−=
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