The figure shows a piece of circular radiator hose. The hose is made of rubber, has an inner diameter of $40$ ?mm and a wall thickness of $4$ ?mm$.$ ?Using the theorems of Pappus Guldinus, find the mass of the piece of hose knowing that the density of the rubber is $1050$ ?kg$/$m$3.$ ?

y- 250mm N 1 40mm .x