Incorrect Question 9 0/2 pts 9. For a material to float on water, the material must have a density less than that of water (1.0 g/mL) and must not react with the water or dissolve in it. A spherical ball has a radius of 0.42 cm and weighs 2.80 g. a) Will this ball float or sink when placed in water? 7.12 g/cm3 b) What is the density of this material, in kg/mm3? 7.12e-3 kg/mm3 Answer 1: 7.12 g/cm3 Answer 2: 7.12e-3 kg/mm3