Apet toy manufacturer is designing a plastic ball for dogs that will float in water. in order for the ball to float it must have a density that is less than 1 gram per milliliter (the density of water). the approved design has a mass of 115 grams and a density of 0.600 g/ml. use the density formula d = m v to determine the radius of the ball to the nearest hundredth of a centimeter. volume of a sphere = 4 3 π r 3