a piece of metal 2kg in weight is suspended from one end of a vertical wire whose other end is fixed and the piece is fully immersed in an oil of density 0.7*10^3 kg m^­3.the length of the wire increases by 1mm.if the diameter of the wire is 0.6mm,youngs modulus is 2*10^11 Nm-22 and the volume of the metal piece is 800 cm^3,then calculate the initial length of the wire

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