An empty spherical iron shell of outer radius r and thickness Ar floats in water with its centre at the water level. Use Archimedes' principle to find that Ar = 0.02r, with the numerical factor rounded to one significant digit. In your calculations, use the water density pw = 103 kg/m³ and the iron density Pir = 7.3 × 103 kg/m³. r Ar

An empty spherical iron shell of outer radius r and thickness Ar floats in water with its centre at the water level. Use Archimedes' principle to find that Ar = 0.02r, with the numerical factor rounded to one significant digit. In your calculations, use the water density pw = 103 kg/m³ and the iron density Pir = 7.3 × 103 kg/m³. r Ar