PROBLEM 10.78 The slender rod ABof negligible mass is attached to two 4-kg blocks Aand Bthat can move freely in the guides shown. Knowing that the constant of the springs is 160 N/m and that the unstretched length of each spring is 150 mm, determine the value of xcorresponding to equilibrium. SOLUTION First note ()()18.104.22.168myx=−−−( )22.214.171.1246 mxx−+−Now, the Potential Energy is 126.96.36.199ABVkxkymgmgy=−+−++( )2188.8.131.52.1116kxkxx=−+−−+−( )184.108.40.206.1116mg mgxx++−−+−For Equilibrium ( )
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