Radioactive wastes generating heat at a rate of 4.5 x 106 w/m3 are contained in a spherical shell of inner radius 0.25 m and outside radius 0.30 m with a thermal conductivity 35.3 w/m·k. if the container is submerged in water at a temperature ∞ 10°c with a convective coefficient of 500 w/m2·k, find the inside and outside surface temperatures of the container.