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 ()()184.108.40.206myx=−−−( )220.127.116.116 mxx−+−Now, the Potential Energy is 18.104.22.168ABVkxkymgmgy=−+−++( )222.214.171.124.1116kxkxx=−+−−+−( )126.96.36.199.1116mg mgxx++−−+−For Equilibrium ( )
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