PROBLEM 10.5 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 G, (b) at points Gand H. SOLUTION First note: 33GDGDxxxxδ=⇒=44HDHDxxxx=55IDIDx=⇒=(a) Virtual Work 0:0GGSPIUFxFxδδ=−=or ( )( ) ( )20 lb 350DSPDxFx−=thus, 12.00 lb SPFT=WNow SPIFkx=∆or ( )12.00 lb
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