Diameter and weight question?

Question

In a single core PVC cable, copper conductor diameter is 0.9 mm, PVC insulation thickness is 0.8 mm. Find out the weight of PVC per KM of cable (density of PVC is 1.5 gm/CC)

Answer 1

Calculate the mass per unit length of the PVC cable

m=ρV

   =ρ((π/4)*d^2)

   =(1.5*10^-3)((π/4)*(0.9*10^-2)^2

   =0.955*10^-7  kg/cm

    =0.955*10^-5 kg/m

Calculate the weight per unit length of the PVC cable

W=mg

   =0.955*10^-5 kg/m*9.81 m/s^2

   =9.365*10^-5 N/m

    =9.365*10^-2 N/km