Calculate the thickness of the copper layer, which is a stream of strength 5.8 A in 3 hours on a ball with the radius 8.3 cm It's the same size. Notes 1: the surface of a sphere 4·pi·r2 Notes 2: Coppering was carried out with a copper sulphate solution Notes 3: density (Cu) = 8.9 g/cm3 Note: Identical task also in the field of redox